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rails--rails/activerecord/lib/active_record/associations.rb
Xavier Noria 64c75d6618 Merge remote branch 'docrails/master'
2010-07-07 12:58:46 +02:00

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require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/enumerable'
require 'active_support/core_ext/module/delegation'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/string/conversions'
module ActiveRecord
class InverseOfAssociationNotFoundError < ActiveRecordError #:nodoc:
def initialize(reflection, associated_class = nil)
super("Could not find the inverse association for #{reflection.name} (#{reflection.options[:inverse_of].inspect} in #{associated_class.nil? ? reflection.class_name : associated_class.name})")
end
end
class HasManyThroughAssociationNotFoundError < ActiveRecordError #:nodoc:
def initialize(owner_class_name, reflection)
super("Could not find the association #{reflection.options[:through].inspect} in model #{owner_class_name}")
end
end
class HasManyThroughAssociationPolymorphicError < ActiveRecordError #:nodoc:
def initialize(owner_class_name, reflection, source_reflection)
super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' on the polymorphic object '#{source_reflection.class_name}##{source_reflection.name}'.")
end
end
class HasManyThroughAssociationPointlessSourceTypeError < ActiveRecordError #:nodoc:
def initialize(owner_class_name, reflection, source_reflection)
super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' with a :source_type option if the '#{reflection.through_reflection.class_name}##{source_reflection.name}' is not polymorphic. Try removing :source_type on your association.")
end
end
class HasManyThroughSourceAssociationNotFoundError < ActiveRecordError #:nodoc:
def initialize(reflection)
through_reflection = reflection.through_reflection
source_reflection_names = reflection.source_reflection_names
source_associations = reflection.through_reflection.klass.reflect_on_all_associations.collect { |a| a.name.inspect }
super("Could not find the source association(s) #{source_reflection_names.collect(&:inspect).to_sentence(:two_words_connector => ' or ', :last_word_connector => ', or ', :locale => :en)} in model #{through_reflection.klass}. Try 'has_many #{reflection.name.inspect}, :through => #{through_reflection.name.inspect}, :source => <name>'. Is it one of #{source_associations.to_sentence(:two_words_connector => ' or ', :last_word_connector => ', or ', :locale => :en)}?")
end
end
class HasManyThroughSourceAssociationMacroError < ActiveRecordError #:nodoc:
def initialize(reflection)
through_reflection = reflection.through_reflection
source_reflection = reflection.source_reflection
super("Invalid source reflection macro :#{source_reflection.macro}#{" :through" if source_reflection.options[:through]} for has_many #{reflection.name.inspect}, :through => #{through_reflection.name.inspect}. Use :source to specify the source reflection.")
end
end
class HasManyThroughCantAssociateThroughHasOneOrManyReflection < ActiveRecordError #:nodoc:
def initialize(owner, reflection)
super("Cannot modify association '#{owner.class.name}##{reflection.name}' because the source reflection class '#{reflection.source_reflection.class_name}' is associated to '#{reflection.through_reflection.class_name}' via :#{reflection.source_reflection.macro}.")
end
end
class HasManyThroughCantAssociateNewRecords < ActiveRecordError #:nodoc:
def initialize(owner, reflection)
super("Cannot associate new records through '#{owner.class.name}##{reflection.name}' on '#{reflection.source_reflection.class_name rescue nil}##{reflection.source_reflection.name rescue nil}'. Both records must have an id in order to create the has_many :through record associating them.")
end
end
class HasManyThroughCantDissociateNewRecords < ActiveRecordError #:nodoc:
def initialize(owner, reflection)
super("Cannot dissociate new records through '#{owner.class.name}##{reflection.name}' on '#{reflection.source_reflection.class_name rescue nil}##{reflection.source_reflection.name rescue nil}'. Both records must have an id in order to delete the has_many :through record associating them.")
end
end
class HasAndBelongsToManyAssociationWithPrimaryKeyError < ActiveRecordError #:nodoc:
def initialize(reflection)
super("Primary key is not allowed in a has_and_belongs_to_many join table (#{reflection.options[:join_table]}).")
end
end
class HasAndBelongsToManyAssociationForeignKeyNeeded < ActiveRecordError #:nodoc:
def initialize(reflection)
super("Cannot create self referential has_and_belongs_to_many association on '#{reflection.class_name rescue nil}##{reflection.name rescue nil}'. :association_foreign_key cannot be the same as the :foreign_key.")
end
end
class EagerLoadPolymorphicError < ActiveRecordError #:nodoc:
def initialize(reflection)
super("Can not eagerly load the polymorphic association #{reflection.name.inspect}")
end
end
class ReadOnlyAssociation < ActiveRecordError #:nodoc:
def initialize(reflection)
super("Can not add to a has_many :through association. Try adding to #{reflection.through_reflection.name.inspect}.")
end
end
# This error is raised when trying to destroy a parent instance in N:1 or 1:1 associations
# (has_many, has_one) when there is at least 1 child associated instance.
# ex: if @project.tasks.size > 0, DeleteRestrictionError will be raised when trying to destroy @project
class DeleteRestrictionError < ActiveRecordError #:nodoc:
def initialize(reflection)
super("Cannot delete record because of dependent #{reflection.name}")
end
end
# See ActiveRecord::Associations::ClassMethods for documentation.
module Associations # :nodoc:
extend ActiveSupport::Concern
# These classes will be loaded when associations are created.
# So there is no need to eager load them.
autoload :AssociationCollection, 'active_record/associations/association_collection'
autoload :AssociationProxy, 'active_record/associations/association_proxy'
autoload :BelongsToAssociation, 'active_record/associations/belongs_to_association'
autoload :BelongsToPolymorphicAssociation, 'active_record/associations/belongs_to_polymorphic_association'
autoload :HasAndBelongsToManyAssociation, 'active_record/associations/has_and_belongs_to_many_association'
autoload :HasManyAssociation, 'active_record/associations/has_many_association'
autoload :HasManyThroughAssociation, 'active_record/associations/has_many_through_association'
autoload :HasOneAssociation, 'active_record/associations/has_one_association'
autoload :HasOneThroughAssociation, 'active_record/associations/has_one_through_association'
# Clears out the association cache
def clear_association_cache #:nodoc:
self.class.reflect_on_all_associations.to_a.each do |assoc|
instance_variable_set "@#{assoc.name}", nil
end unless self.new_record?
end
private
# Gets the specified association instance if it responds to :loaded?, nil otherwise.
def association_instance_get(name)
ivar = "@#{name}"
if instance_variable_defined?(ivar)
association = instance_variable_get(ivar)
association if association.respond_to?(:loaded?)
end
end
# Set the specified association instance.
def association_instance_set(name, association)
instance_variable_set("@#{name}", association)
end
# Associations are a set of macro-like class methods for tying objects together through foreign keys. They express relationships like
# "Project has one Project Manager" or "Project belongs to a Portfolio". Each macro adds a number of methods to the class which are
# specialized according to the collection or association symbol and the options hash. It works much the same way as Ruby's own <tt>attr*</tt>
# methods. Example:
#
# class Project < ActiveRecord::Base
# belongs_to :portfolio
# has_one :project_manager
# has_many :milestones
# has_and_belongs_to_many :categories
# end
#
# The project class now has the following methods (and more) to ease the traversal and manipulation of its relationships:
# * <tt>Project#portfolio, Project#portfolio=(portfolio), Project#portfolio.nil?</tt>
# * <tt>Project#project_manager, Project#project_manager=(project_manager), Project#project_manager.nil?,</tt>
# * <tt>Project#milestones.empty?, Project#milestones.size, Project#milestones, Project#milestones<<(milestone),</tt>
# <tt>Project#milestones.delete(milestone), Project#milestones.find(milestone_id), Project#milestones.find(:all, options),</tt>
# <tt>Project#milestones.build, Project#milestones.create</tt>
# * <tt>Project#categories.empty?, Project#categories.size, Project#categories, Project#categories<<(category1),</tt>
# <tt>Project#categories.delete(category1)</tt>
#
# === A word of warning
#
# Don't create associations that have the same name as instance methods of ActiveRecord::Base. Since the association
# adds a method with that name to its model, it will override the inherited method and break things.
# For instance, +attributes+ and +connection+ would be bad choices for association names.
#
# == Auto-generated methods
#
# === Singular associations (one-to-one)
# | | belongs_to |
# generated methods | belongs_to | :polymorphic | has_one
# ----------------------------------+------------+--------------+---------
# other | X | X | X
# other=(other) | X | X | X
# build_other(attributes={}) | X | | X
# create_other(attributes={}) | X | | X
# other.create!(attributes={}) | | | X
#
# ===Collection associations (one-to-many / many-to-many)
# | | | has_many
# generated methods | habtm | has_many | :through
# ----------------------------------+-------+----------+----------
# others | X | X | X
# others=(other,other,...) | X | X | X
# other_ids | X | X | X
# other_ids=(id,id,...) | X | X | X
# others<< | X | X | X
# others.push | X | X | X
# others.concat | X | X | X
# others.build(attributes={}) | X | X | X
# others.create(attributes={}) | X | X | X
# others.create!(attributes={}) | X | X | X
# others.size | X | X | X
# others.length | X | X | X
# others.count | X | X | X
# others.sum(args*,&block) | X | X | X
# others.empty? | X | X | X
# others.clear | X | X | X
# others.delete(other,other,...) | X | X | X
# others.delete_all | X | X |
# others.destroy_all | X | X | X
# others.find(*args) | X | X | X
# others.find_first | X | |
# others.exists? | X | X | X
# others.uniq | X | X | X
# others.reset | X | X | X
#
# == Cardinality and associations
#
# Active Record associations can be used to describe one-to-one, one-to-many and many-to-many
# relationships between models. Each model uses an association to describe its role in
# the relation. The +belongs_to+ association is always used in the model that has
# the foreign key.
#
# === One-to-one
#
# Use +has_one+ in the base, and +belongs_to+ in the associated model.
#
# class Employee < ActiveRecord::Base
# has_one :office
# end
# class Office < ActiveRecord::Base
# belongs_to :employee # foreign key - employee_id
# end
#
# === One-to-many
#
# Use +has_many+ in the base, and +belongs_to+ in the associated model.
#
# class Manager < ActiveRecord::Base
# has_many :employees
# end
# class Employee < ActiveRecord::Base
# belongs_to :manager # foreign key - manager_id
# end
#
# === Many-to-many
#
# There are two ways to build a many-to-many relationship.
#
# The first way uses a +has_many+ association with the <tt>:through</tt> option and a join model, so
# there are two stages of associations.
#
# class Assignment < ActiveRecord::Base
# belongs_to :programmer # foreign key - programmer_id
# belongs_to :project # foreign key - project_id
# end
# class Programmer < ActiveRecord::Base
# has_many :assignments
# has_many :projects, :through => :assignments
# end
# class Project < ActiveRecord::Base
# has_many :assignments
# has_many :programmers, :through => :assignments
# end
#
# For the second way, use +has_and_belongs_to_many+ in both models. This requires a join table
# that has no corresponding model or primary key.
#
# class Programmer < ActiveRecord::Base
# has_and_belongs_to_many :projects # foreign keys in the join table
# end
# class Project < ActiveRecord::Base
# has_and_belongs_to_many :programmers # foreign keys in the join table
# end
#
# Choosing which way to build a many-to-many relationship is not always simple.
# If you need to work with the relationship model as its own entity,
# use <tt>has_many :through</tt>. Use +has_and_belongs_to_many+ when working with legacy schemas or when
# you never work directly with the relationship itself.
#
# == Is it a +belongs_to+ or +has_one+ association?
#
# Both express a 1-1 relationship. The difference is mostly where to place the foreign key, which goes on the table for the class
# declaring the +belongs_to+ relationship. Example:
#
# class User < ActiveRecord::Base
# # I reference an account.
# belongs_to :account
# end
#
# class Account < ActiveRecord::Base
# # One user references me.
# has_one :user
# end
#
# The tables for these classes could look something like:
#
# CREATE TABLE users (
# id int(11) NOT NULL auto_increment,
# account_id int(11) default NULL,
# name varchar default NULL,
# PRIMARY KEY (id)
# )
#
# CREATE TABLE accounts (
# id int(11) NOT NULL auto_increment,
# name varchar default NULL,
# PRIMARY KEY (id)
# )
#
# == Unsaved objects and associations
#
# You can manipulate objects and associations before they are saved to the database, but there is some special behavior you should be
# aware of, mostly involving the saving of associated objects.
#
# Unless you set the :autosave option on a <tt>has_one</tt>, <tt>belongs_to</tt>,
# <tt>has_many</tt>, or <tt>has_and_belongs_to_many</tt> association. Setting it
# to +true+ will _always_ save the members, whereas setting it to +false+ will
# _never_ save the members.
#
# === One-to-one associations
#
# * Assigning an object to a +has_one+ association automatically saves that object and the object being replaced (if there is one), in
# order to update their primary keys - except if the parent object is unsaved (<tt>new_record? == true</tt>).
# * If either of these saves fail (due to one of the objects being invalid) the assignment statement returns +false+ and the assignment
# is cancelled.
# * If you wish to assign an object to a +has_one+ association without saving it, use the <tt>association.build</tt> method (documented below).
# * Assigning an object to a +belongs_to+ association does not save the object, since the foreign key field belongs on the parent. It
# does not save the parent either.
#
# === Collections
#
# * Adding an object to a collection (+has_many+ or +has_and_belongs_to_many+) automatically saves that object, except if the parent object
# (the owner of the collection) is not yet stored in the database.
# * If saving any of the objects being added to a collection (via <tt>push</tt> or similar) fails, then <tt>push</tt> returns +false+.
# * You can add an object to a collection without automatically saving it by using the <tt>collection.build</tt> method (documented below).
# * All unsaved (<tt>new_record? == true</tt>) members of the collection are automatically saved when the parent is saved.
#
# === Association callbacks
#
# Similar to the normal callbacks that hook into the lifecycle of an Active Record object, you can also define callbacks that get
# triggered when you add an object to or remove an object from an association collection. Example:
#
# class Project
# has_and_belongs_to_many :developers, :after_add => :evaluate_velocity
#
# def evaluate_velocity(developer)
# ...
# end
# end
#
# It's possible to stack callbacks by passing them as an array. Example:
#
# class Project
# has_and_belongs_to_many :developers, :after_add => [:evaluate_velocity, Proc.new { |p, d| p.shipping_date = Time.now}]
# end
#
# Possible callbacks are: +before_add+, +after_add+, +before_remove+ and +after_remove+.
#
# Should any of the +before_add+ callbacks throw an exception, the object does not get added to the collection. Same with
# the +before_remove+ callbacks; if an exception is thrown the object doesn't get removed.
#
# === Association extensions
#
# The proxy objects that control the access to associations can be extended through anonymous modules. This is especially
# beneficial for adding new finders, creators, and other factory-type methods that are only used as part of this association.
# Example:
#
# class Account < ActiveRecord::Base
# has_many :people do
# def find_or_create_by_name(name)
# first_name, last_name = name.split(" ", 2)
# find_or_create_by_first_name_and_last_name(first_name, last_name)
# end
# end
# end
#
# person = Account.find(:first).people.find_or_create_by_name("David Heinemeier Hansson")
# person.first_name # => "David"
# person.last_name # => "Heinemeier Hansson"
#
# If you need to share the same extensions between many associations, you can use a named extension module. Example:
#
# module FindOrCreateByNameExtension
# def find_or_create_by_name(name)
# first_name, last_name = name.split(" ", 2)
# find_or_create_by_first_name_and_last_name(first_name, last_name)
# end
# end
#
# class Account < ActiveRecord::Base
# has_many :people, :extend => FindOrCreateByNameExtension
# end
#
# class Company < ActiveRecord::Base
# has_many :people, :extend => FindOrCreateByNameExtension
# end
#
# If you need to use multiple named extension modules, you can specify an array of modules with the <tt>:extend</tt> option.
# In the case of name conflicts between methods in the modules, methods in modules later in the array supercede
# those earlier in the array. Example:
#
# class Account < ActiveRecord::Base
# has_many :people, :extend => [FindOrCreateByNameExtension, FindRecentExtension]
# end
#
# Some extensions can only be made to work with knowledge of the association proxy's internals.
# Extensions can access relevant state using accessors on the association proxy:
#
# * +proxy_owner+ - Returns the object the association is part of.
# * +proxy_reflection+ - Returns the reflection object that describes the association.
# * +proxy_target+ - Returns the associated object for +belongs_to+ and +has_one+, or the collection of associated objects for +has_many+ and +has_and_belongs_to_many+.
#
# === Association Join Models
#
# Has Many associations can be configured with the <tt>:through</tt> option to use an explicit join model to retrieve the data. This
# operates similarly to a +has_and_belongs_to_many+ association. The advantage is that you're able to add validations,
# callbacks, and extra attributes on the join model. Consider the following schema:
#
# class Author < ActiveRecord::Base
# has_many :authorships
# has_many :books, :through => :authorships
# end
#
# class Authorship < ActiveRecord::Base
# belongs_to :author
# belongs_to :book
# end
#
# @author = Author.find :first
# @author.authorships.collect { |a| a.book } # selects all books that the author's authorships belong to.
# @author.books # selects all books by using the Authorship join model
#
# You can also go through a +has_many+ association on the join model:
#
# class Firm < ActiveRecord::Base
# has_many :clients
# has_many :invoices, :through => :clients
# end
#
# class Client < ActiveRecord::Base
# belongs_to :firm
# has_many :invoices
# end
#
# class Invoice < ActiveRecord::Base
# belongs_to :client
# end
#
# @firm = Firm.find :first
# @firm.clients.collect { |c| c.invoices }.flatten # select all invoices for all clients of the firm
# @firm.invoices # selects all invoices by going through the Client join model.
#
# Similarly you can go through a +has_one+ association on the join model:
#
# class Group < ActiveRecord::Base
# has_many :users
# has_many :avatars, :through => :users
# end
#
# class User < ActiveRecord::Base
# belongs_to :group
# has_one :avatar
# end
#
# class Avatar < ActiveRecord::Base
# belongs_to :user
# end
#
# @group = Group.first
# @group.users.collect { |u| u.avatar }.flatten # select all avatars for all users in the group
# @group.avatars # selects all avatars by going through the User join model.
#
# An important caveat with going through +has_one+ or +has_many+ associations on the join model is that these associations are
# *read-only*. For example, the following would not work following the previous example:
#
# @group.avatars << Avatar.new # this would work if User belonged_to Avatar rather than the other way around.
# @group.avatars.delete(@group.avatars.last) # so would this
#
# === Polymorphic Associations
#
# Polymorphic associations on models are not restricted on what types of models they can be associated with. Rather, they
# specify an interface that a +has_many+ association must adhere to.
#
# class Asset < ActiveRecord::Base
# belongs_to :attachable, :polymorphic => true
# end
#
# class Post < ActiveRecord::Base
# has_many :assets, :as => :attachable # The :as option specifies the polymorphic interface to use.
# end
#
# @asset.attachable = @post
#
# This works by using a type column in addition to a foreign key to specify the associated record. In the Asset example, you'd need
# an +attachable_id+ integer column and an +attachable_type+ string column.
#
# Using polymorphic associations in combination with single table inheritance (STI) is a little tricky. In order
# for the associations to work as expected, ensure that you store the base model for the STI models in the
# type column of the polymorphic association. To continue with the asset example above, suppose there are guest posts
# and member posts that use the posts table for STI. In this case, there must be a +type+ column in the posts table.
#
# class Asset < ActiveRecord::Base
# belongs_to :attachable, :polymorphic => true
#
# def attachable_type=(sType)
# super(sType.to_s.classify.constantize.base_class.to_s)
# end
# end
#
# class Post < ActiveRecord::Base
# # because we store "Post" in attachable_type now :dependent => :destroy will work
# has_many :assets, :as => :attachable, :dependent => :destroy
# end
#
# class GuestPost < Post
# end
#
# class MemberPost < Post
# end
#
# == Caching
#
# All of the methods are built on a simple caching principle that will keep the result of the last query around unless specifically
# instructed not to. The cache is even shared across methods to make it even cheaper to use the macro-added methods without
# worrying too much about performance at the first go. Example:
#
# project.milestones # fetches milestones from the database
# project.milestones.size # uses the milestone cache
# project.milestones.empty? # uses the milestone cache
# project.milestones(true).size # fetches milestones from the database
# project.milestones # uses the milestone cache
#
# == Eager loading of associations
#
# Eager loading is a way to find objects of a certain class and a number of named associations. This is
# one of the easiest ways of to prevent the dreaded 1+N problem in which fetching 100 posts that each need to display their author
# triggers 101 database queries. Through the use of eager loading, the 101 queries can be reduced to 2. Example:
#
# class Post < ActiveRecord::Base
# belongs_to :author
# has_many :comments
# end
#
# Consider the following loop using the class above:
#
# for post in Post.all
# puts "Post: " + post.title
# puts "Written by: " + post.author.name
# puts "Last comment on: " + post.comments.first.created_on
# end
#
# To iterate over these one hundred posts, we'll generate 201 database queries. Let's first just optimize it for retrieving the author:
#
# for post in Post.find(:all, :include => :author)
#
# This references the name of the +belongs_to+ association that also used the <tt>:author</tt> symbol. After loading the posts, find
# will collect the +author_id+ from each one and load all the referenced authors with one query. Doing so will cut down the number of queries from 201 to 102.
#
# We can improve upon the situation further by referencing both associations in the finder with:
#
# for post in Post.find(:all, :include => [ :author, :comments ])
#
# This will load all comments with a single query. This reduces the total number of queries to 3. More generally the number of queries
# will be 1 plus the number of associations named (except if some of the associations are polymorphic +belongs_to+ - see below).
#
# To include a deep hierarchy of associations, use a hash:
#
# for post in Post.find(:all, :include => [ :author, { :comments => { :author => :gravatar } } ])
#
# That'll grab not only all the comments but all their authors and gravatar pictures. You can mix and match
# symbols, arrays and hashes in any combination to describe the associations you want to load.
#
# All of this power shouldn't fool you into thinking that you can pull out huge amounts of data with no performance penalty just because you've reduced
# the number of queries. The database still needs to send all the data to Active Record and it still needs to be processed. So it's no
# catch-all for performance problems, but it's a great way to cut down on the number of queries in a situation as the one described above.
#
# Since only one table is loaded at a time, conditions or orders cannot reference tables other than the main one. If this is the case
# Active Record falls back to the previously used LEFT OUTER JOIN based strategy. For example
#
# Post.find(:all, :include => [ :author, :comments ], :conditions => ['comments.approved = ?', true])
#
# This will result in a single SQL query with joins along the lines of: <tt>LEFT OUTER JOIN comments ON comments.post_id = posts.id</tt> and
# <tt>LEFT OUTER JOIN authors ON authors.id = posts.author_id</tt>. Note that using conditions like this can have unintended consequences.
# In the above example posts with no approved comments are not returned at all, because the conditions apply to the SQL statement as a whole
# and not just to the association. You must disambiguate column references for this fallback to happen, for example
# <tt>:order => "author.name DESC"</tt> will work but <tt>:order => "name DESC"</tt> will not.
#
# If you do want eager load only some members of an association it is usually more natural to <tt>:include</tt> an association
# which has conditions defined on it:
#
# class Post < ActiveRecord::Base
# has_many :approved_comments, :class_name => 'Comment', :conditions => ['approved = ?', true]
# end
#
# Post.find(:all, :include => :approved_comments)
#
# This will load posts and eager load the +approved_comments+ association, which contains only those comments that have been approved.
#
# If you eager load an association with a specified <tt>:limit</tt> option, it will be ignored, returning all the associated objects:
#
# class Picture < ActiveRecord::Base
# has_many :most_recent_comments, :class_name => 'Comment', :order => 'id DESC', :limit => 10
# end
#
# Picture.find(:first, :include => :most_recent_comments).most_recent_comments # => returns all associated comments.
#
# When eager loaded, conditions are interpolated in the context of the model class, not the model instance. Conditions are lazily interpolated
# before the actual model exists.
#
# Eager loading is supported with polymorphic associations.
#
# class Address < ActiveRecord::Base
# belongs_to :addressable, :polymorphic => true
# end
#
# A call that tries to eager load the addressable model
#
# Address.find(:all, :include => :addressable)
#
# This will execute one query to load the addresses and load the addressables with one query per addressable type.
# For example if all the addressables are either of class Person or Company then a total of 3 queries will be executed. The list of
# addressable types to load is determined on the back of the addresses loaded. This is not supported if Active Record has to fallback
# to the previous implementation of eager loading and will raise ActiveRecord::EagerLoadPolymorphicError. The reason is that the parent
# model's type is a column value so its corresponding table name cannot be put in the +FROM+/+JOIN+ clauses of that query.
#
# == Table Aliasing
#
# Active Record uses table aliasing in the case that a table is referenced multiple times in a join. If a table is referenced only once,
# the standard table name is used. The second time, the table is aliased as <tt>#{reflection_name}_#{parent_table_name}</tt>. Indexes are appended
# for any more successive uses of the table name.
#
# Post.find :all, :joins => :comments
# # => SELECT ... FROM posts INNER JOIN comments ON ...
# Post.find :all, :joins => :special_comments # STI
# # => SELECT ... FROM posts INNER JOIN comments ON ... AND comments.type = 'SpecialComment'
# Post.find :all, :joins => [:comments, :special_comments] # special_comments is the reflection name, posts is the parent table name
# # => SELECT ... FROM posts INNER JOIN comments ON ... INNER JOIN comments special_comments_posts
#
# Acts as tree example:
#
# TreeMixin.find :all, :joins => :children
# # => SELECT ... FROM mixins INNER JOIN mixins childrens_mixins ...
# TreeMixin.find :all, :joins => {:children => :parent}
# # => SELECT ... FROM mixins INNER JOIN mixins childrens_mixins ...
# INNER JOIN parents_mixins ...
# TreeMixin.find :all, :joins => {:children => {:parent => :children}}
# # => SELECT ... FROM mixins INNER JOIN mixins childrens_mixins ...
# INNER JOIN parents_mixins ...
# INNER JOIN mixins childrens_mixins_2
#
# Has and Belongs to Many join tables use the same idea, but add a <tt>_join</tt> suffix:
#
# Post.find :all, :joins => :categories
# # => SELECT ... FROM posts INNER JOIN categories_posts ... INNER JOIN categories ...
# Post.find :all, :joins => {:categories => :posts}
# # => SELECT ... FROM posts INNER JOIN categories_posts ... INNER JOIN categories ...
# INNER JOIN categories_posts posts_categories_join INNER JOIN posts posts_categories
# Post.find :all, :joins => {:categories => {:posts => :categories}}
# # => SELECT ... FROM posts INNER JOIN categories_posts ... INNER JOIN categories ...
# INNER JOIN categories_posts posts_categories_join INNER JOIN posts posts_categories
# INNER JOIN categories_posts categories_posts_join INNER JOIN categories categories_posts_2
#
# If you wish to specify your own custom joins using a <tt>:joins</tt> option, those table names will take precedence over the eager associations:
#
# Post.find :all, :joins => :comments, :joins => "inner join comments ..."
# # => SELECT ... FROM posts INNER JOIN comments_posts ON ... INNER JOIN comments ...
# Post.find :all, :joins => [:comments, :special_comments], :joins => "inner join comments ..."
# # => SELECT ... FROM posts INNER JOIN comments comments_posts ON ...
# INNER JOIN comments special_comments_posts ...
# INNER JOIN comments ...
#
# Table aliases are automatically truncated according to the maximum length of table identifiers according to the specific database.
#
# == Modules
#
# By default, associations will look for objects within the current module scope. Consider:
#
# module MyApplication
# module Business
# class Firm < ActiveRecord::Base
# has_many :clients
# end
#
# class Client < ActiveRecord::Base; end
# end
# end
#
# When <tt>Firm#clients</tt> is called, it will in turn call <tt>MyApplication::Business::Client.find_all_by_firm_id(firm.id)</tt>.
# If you want to associate with a class in another module scope, this can be done by specifying the complete class name.
# Example:
#
# module MyApplication
# module Business
# class Firm < ActiveRecord::Base; end
# end
#
# module Billing
# class Account < ActiveRecord::Base
# belongs_to :firm, :class_name => "MyApplication::Business::Firm"
# end
# end
# end
#
# == Bi-directional associations
#
# When you specify an association there is usually an association on the associated model that specifies the same
# relationship in reverse. For example, with the following models:
#
# class Dungeon < ActiveRecord::Base
# has_many :traps
# has_one :evil_wizard
# end
#
# class Trap < ActiveRecord::Base
# belongs_to :dungeon
# end
#
# class EvilWizard < ActiveRecord::Base
# belongs_to :dungeon
# end
#
# The +traps+ association on +Dungeon+ and the the +dungeon+ association on +Trap+ are the inverse of each other and the
# inverse of the +dungeon+ association on +EvilWizard+ is the +evil_wizard+ association on +Dungeon+ (and vice-versa). By default,
# Active Record doesn't know anything about these inverse relationships and so no object loading optimisation is possible. For example:
#
# d = Dungeon.first
# t = d.traps.first
# d.level == t.dungeon.level # => true
# d.level = 10
# d.level == t.dungeon.level # => false
#
# The +Dungeon+ instances +d+ and <tt>t.dungeon</tt> in the above example refer to the same object data from the database, but are
# actually different in-memory copies of that data. Specifying the <tt>:inverse_of</tt> option on associations lets you tell
# Active Record about inverse relationships and it will optimise object loading. For example, if we changed our model definitions to:
#
# class Dungeon < ActiveRecord::Base
# has_many :traps, :inverse_of => :dungeon
# has_one :evil_wizard, :inverse_of => :dungeon
# end
#
# class Trap < ActiveRecord::Base
# belongs_to :dungeon, :inverse_of => :traps
# end
#
# class EvilWizard < ActiveRecord::Base
# belongs_to :dungeon, :inverse_of => :evil_wizard
# end
#
# Then, from our code snippet above, +d+ and <tt>t.dungeon</tt> are actually the same in-memory instance and our final <tt>d.level == t.dungeon.level</tt>
# will return +true+.
#
# There are limitations to <tt>:inverse_of</tt> support:
#
# * does not work with <tt>:through</tt> associations.
# * does not work with <tt>:polymorphic</tt> associations.
# * for +belongs_to+ associations +has_many+ inverse associations are ignored.
#
# == Type safety with <tt>ActiveRecord::AssociationTypeMismatch</tt>
#
# If you attempt to assign an object to an association that doesn't match the inferred or specified <tt>:class_name</tt>, you'll
# get an <tt>ActiveRecord::AssociationTypeMismatch</tt>.
#
# == Options
#
# All of the association macros can be specialized through options. This makes cases more complex than the simple and guessable ones
# possible.
module ClassMethods
# Specifies a one-to-many association. The following methods for retrieval and query of
# collections of associated objects will be added:
#
# [collection(force_reload = false)]
# Returns an array of all the associated objects.
# An empty array is returned if none are found.
# [collection<<(object, ...)]
# Adds one or more objects to the collection by setting their foreign keys to the collection's primary key.
# Note that this operation instantly fires update sql without waiting for the save or update call on the
# parent object.
# [collection.delete(object, ...)]
# Removes one or more objects from the collection by setting their foreign keys to +NULL+.
# Objects will be in addition destroyed if they're associated with <tt>:dependent => :destroy</tt>,
# and deleted if they're associated with <tt>:dependent => :delete_all</tt>.
# [collection=objects]
# Replaces the collections content by deleting and adding objects as appropriate. If the <tt>:through</tt>
# option is true callbacks in the join models are triggered except destroy callbacks, since deletion is
# direct.
# [collection_singular_ids]
# Returns an array of the associated objects' ids
# [collection_singular_ids=ids]
# Replace the collection with the objects identified by the primary keys in +ids+. This
# method loads the models and calls <tt>collection=</tt>. See above.
# [collection.clear]
# Removes every object from the collection. This destroys the associated objects if they
# are associated with <tt>:dependent => :destroy</tt>, deletes them directly from the
# database if <tt>:dependent => :delete_all</tt>, otherwise sets their foreign keys to +NULL+.
# If the <tt>:through</tt> option is true no destroy callbacks are invoked on the join models.
# Join models are directly deleted.
# [collection.empty?]
# Returns +true+ if there are no associated objects.
# [collection.size]
# Returns the number of associated objects.
# [collection.find(...)]
# Finds an associated object according to the same rules as ActiveRecord::Base.find.
# [collection.exists?(...)]
# Checks whether an associated object with the given conditions exists.
# Uses the same rules as ActiveRecord::Base.exists?.
# [collection.build(attributes = {}, ...)]
# Returns one or more new objects of the collection type that have been instantiated
# with +attributes+ and linked to this object through a foreign key, but have not yet
# been saved.
# [collection.create(attributes = {})]
# Returns a new object of the collection type that has been instantiated
# with +attributes+, linked to this object through a foreign key, and that has already
# been saved (if it passed the validation). *Note*: This only works if the base model
# already exists in the DB, not if it is a new (unsaved) record!
#
# (*Note*: +collection+ is replaced with the symbol passed as the first argument, so
# <tt>has_many :clients</tt> would add among others <tt>clients.empty?</tt>.)
#
# === Example
#
# Example: A Firm class declares <tt>has_many :clients</tt>, which will add:
# * <tt>Firm#clients</tt> (similar to <tt>Clients.find :all, :conditions => ["firm_id = ?", id]</tt>)
# * <tt>Firm#clients<<</tt>
# * <tt>Firm#clients.delete</tt>
# * <tt>Firm#clients=</tt>
# * <tt>Firm#client_ids</tt>
# * <tt>Firm#client_ids=</tt>
# * <tt>Firm#clients.clear</tt>
# * <tt>Firm#clients.empty?</tt> (similar to <tt>firm.clients.size == 0</tt>)
# * <tt>Firm#clients.size</tt> (similar to <tt>Client.count "firm_id = #{id}"</tt>)
# * <tt>Firm#clients.find</tt> (similar to <tt>Client.find(id, :conditions => "firm_id = #{id}")</tt>)
# * <tt>Firm#clients.exists?(:name => 'ACME')</tt> (similar to <tt>Client.exists?(:name => 'ACME', :firm_id => firm.id)</tt>)
# * <tt>Firm#clients.build</tt> (similar to <tt>Client.new("firm_id" => id)</tt>)
# * <tt>Firm#clients.create</tt> (similar to <tt>c = Client.new("firm_id" => id); c.save; c</tt>)
# The declaration can also include an options hash to specialize the behavior of the association.
#
# === Supported options
# [:class_name]
# Specify the class name of the association. Use it only if that name can't be inferred
# from the association name. So <tt>has_many :products</tt> will by default be linked to the Product class, but
# if the real class name is SpecialProduct, you'll have to specify it with this option.
# [:conditions]
# Specify the conditions that the associated objects must meet in order to be included as a +WHERE+
# SQL fragment, such as <tt>price > 5 AND name LIKE 'B%'</tt>. Record creations from the association are scoped if a hash
# is used. <tt>has_many :posts, :conditions => {:published => true}</tt> will create published posts with <tt>@blog.posts.create</tt>
# or <tt>@blog.posts.build</tt>.
# [:order]
# Specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment,
# such as <tt>last_name, first_name DESC</tt>.
# [:foreign_key]
# Specify the foreign key used for the association. By default this is guessed to be the name
# of this class in lower-case and "_id" suffixed. So a Person class that makes a +has_many+ association will use "person_id"
# as the default <tt>:foreign_key</tt>.
# [:primary_key]
# Specify the method that returns the primary key used for the association. By default this is +id+.
# [:dependent]
# If set to <tt>:destroy</tt> all the associated objects are destroyed
# alongside this object by calling their +destroy+ method. If set to <tt>:delete_all</tt> all associated
# objects are deleted *without* calling their +destroy+ method. If set to <tt>:nullify</tt> all associated
# objects' foreign keys are set to +NULL+ *without* calling their +save+ callbacks. If set to
# <tt>:restrict</tt> this object cannot be deleted if it has any associated object.
#
# *Warning:* This option is ignored when used with <tt>:through</tt> option.
#
# [:finder_sql]
# Specify a complete SQL statement to fetch the association. This is a good way to go for complex
# associations that depend on multiple tables. Note: When this option is used, +find_in_collection+ is _not_ added.
# [:counter_sql]
# Specify a complete SQL statement to fetch the size of the association. If <tt>:finder_sql</tt> is
# specified but not <tt>:counter_sql</tt>, <tt>:counter_sql</tt> will be generated by replacing <tt>SELECT ... FROM</tt> with <tt>SELECT COUNT(*) FROM</tt>.
# [:extend]
# Specify a named module for extending the proxy. See "Association extensions".
# [:include]
# Specify second-order associations that should be eager loaded when the collection is loaded.
# [:group]
# An attribute name by which the result should be grouped. Uses the <tt>GROUP BY</tt> SQL-clause.
# [:having]
# Combined with +:group+ this can be used to filter the records that a <tt>GROUP BY</tt> returns. Uses the <tt>HAVING</tt> SQL-clause.
# [:limit]
# An integer determining the limit on the number of rows that should be returned.
# [:offset]
# An integer determining the offset from where the rows should be fetched. So at 5, it would skip the first 4 rows.
# [:select]
# By default, this is <tt>*</tt> as in <tt>SELECT * FROM</tt>, but can be changed if you, for example, want to do a join
# but not include the joined columns. Do not forget to include the primary and foreign keys, otherwise it will raise an error.
# [:as]
# Specifies a polymorphic interface (See <tt>belongs_to</tt>).
# [:through]
# Specifies a join model through which to perform the query. Options for <tt>:class_name</tt> and <tt>:foreign_key</tt>
# are ignored, as the association uses the source reflection. You can only use a <tt>:through</tt> query through a <tt>belongs_to</tt>
# <tt>has_one</tt> or <tt>has_many</tt> association on the join model. The collection of join models can be managed via the collection
# API. For example, new join models are created for newly associated objects, and if some are gone their rows are deleted (directly,
# no destroy callbacks are triggered).
# [:source]
# Specifies the source association name used by <tt>has_many :through</tt> queries. Only use it if the name cannot be
# inferred from the association. <tt>has_many :subscribers, :through => :subscriptions</tt> will look for either <tt>:subscribers</tt> or
# <tt>:subscriber</tt> on Subscription, unless a <tt>:source</tt> is given.
# [:source_type]
# Specifies type of the source association used by <tt>has_many :through</tt> queries where the source
# association is a polymorphic +belongs_to+.
# [:uniq]
# If true, duplicates will be omitted from the collection. Useful in conjunction with <tt>:through</tt>.
# [:readonly]
# If true, all the associated objects are readonly through the association.
# [:validate]
# If false, don't validate the associated objects when saving the parent object. true by default.
# [:autosave]
# If true, always save the associated objects or destroy them if marked for destruction, when saving the parent object.
# If false, never save or destroy the associated objects.
# By default, only save associated objects that are new records.
# [:inverse_of]
# Specifies the name of the <tt>belongs_to</tt> association on the associated object that is the inverse of this <tt>has_many</tt>
# association. Does not work in combination with <tt>:through</tt> or <tt>:as</tt> options.
# See ActiveRecord::Associations::ClassMethods's overview on Bi-directional associations for more detail.
#
# Option examples:
# has_many :comments, :order => "posted_on"
# has_many :comments, :include => :author
# has_many :people, :class_name => "Person", :conditions => "deleted = 0", :order => "name"
# has_many :tracks, :order => "position", :dependent => :destroy
# has_many :comments, :dependent => :nullify
# has_many :tags, :as => :taggable
# has_many :reports, :readonly => true
# has_many :subscribers, :through => :subscriptions, :source => :user
# has_many :subscribers, :class_name => "Person", :finder_sql =>
# 'SELECT DISTINCT people.* ' +
# 'FROM people p, post_subscriptions ps ' +
# 'WHERE ps.post_id = #{id} AND ps.person_id = p.id ' +
# 'ORDER BY p.first_name'
def has_many(association_id, options = {}, &extension)
reflection = create_has_many_reflection(association_id, options, &extension)
configure_dependency_for_has_many(reflection)
add_association_callbacks(reflection.name, reflection.options)
if options[:through]
collection_accessor_methods(reflection, HasManyThroughAssociation)
else
collection_accessor_methods(reflection, HasManyAssociation)
end
end
# Specifies a one-to-one association with another class. This method should only be used
# if the other class contains the foreign key. If the current class contains the foreign key,
# then you should use +belongs_to+ instead. See also ActiveRecord::Associations::ClassMethods's overview
# on when to use has_one and when to use belongs_to.
#
# The following methods for retrieval and query of a single associated object will be added:
#
# [association(force_reload = false)]
# Returns the associated object. +nil+ is returned if none is found.
# [association=(associate)]
# Assigns the associate object, extracts the primary key, sets it as the foreign key,
# and saves the associate object.
# [build_association(attributes = {})]
# Returns a new object of the associated type that has been instantiated
# with +attributes+ and linked to this object through a foreign key, but has not
# yet been saved. <b>Note:</b> This ONLY works if an association already exists.
# It will NOT work if the association is +nil+.
# [create_association(attributes = {})]
# Returns a new object of the associated type that has been instantiated
# with +attributes+, linked to this object through a foreign key, and that
# has already been saved (if it passed the validation).
#
# (+association+ is replaced with the symbol passed as the first argument, so
# <tt>has_one :manager</tt> would add among others <tt>manager.nil?</tt>.)
#
# === Example
#
# An Account class declares <tt>has_one :beneficiary</tt>, which will add:
# * <tt>Account#beneficiary</tt> (similar to <tt>Beneficiary.find(:first, :conditions => "account_id = #{id}")</tt>)
# * <tt>Account#beneficiary=(beneficiary)</tt> (similar to <tt>beneficiary.account_id = account.id; beneficiary.save</tt>)
# * <tt>Account#build_beneficiary</tt> (similar to <tt>Beneficiary.new("account_id" => id)</tt>)
# * <tt>Account#create_beneficiary</tt> (similar to <tt>b = Beneficiary.new("account_id" => id); b.save; b</tt>)
#
# === Options
#
# The declaration can also include an options hash to specialize the behavior of the association.
#
# Options are:
# [:class_name]
# Specify the class name of the association. Use it only if that name can't be inferred
# from the association name. So <tt>has_one :manager</tt> will by default be linked to the Manager class, but
# if the real class name is Person, you'll have to specify it with this option.
# [:conditions]
# Specify the conditions that the associated object must meet in order to be included as a +WHERE+
# SQL fragment, such as <tt>rank = 5</tt>. Record creation from the association is scoped if a hash
# is used. <tt>has_one :account, :conditions => {:enabled => true}</tt> will create an enabled account with <tt>@company.create_account</tt>
# or <tt>@company.build_account</tt>.
# [:order]
# Specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment,
# such as <tt>last_name, first_name DESC</tt>.
# [:dependent]
# If set to <tt>:destroy</tt>, the associated object is destroyed when this object is. If set to
# <tt>:delete</tt>, the associated object is deleted *without* calling its destroy method. If set to <tt>:nullify</tt>, the associated
# object's foreign key is set to +NULL+. Also, association is assigned.
# [:foreign_key]
# Specify the foreign key used for the association. By default this is guessed to be the name
# of this class in lower-case and "_id" suffixed. So a Person class that makes a +has_one+ association will use "person_id"
# as the default <tt>:foreign_key</tt>.
# [:primary_key]
# Specify the method that returns the primary key used for the association. By default this is +id+.
# [:include]
# Specify second-order associations that should be eager loaded when this object is loaded.
# [:as]
# Specifies a polymorphic interface (See <tt>belongs_to</tt>).
# [:select]
# By default, this is <tt>*</tt> as in <tt>SELECT * FROM</tt>, but can be changed if, for example, you want to do a join
# but not include the joined columns. Do not forget to include the primary and foreign keys, otherwise it will raise an error.
# [:through]
# Specifies a Join Model through which to perform the query. Options for <tt>:class_name</tt> and <tt>:foreign_key</tt>
# are ignored, as the association uses the source reflection. You can only use a <tt>:through</tt> query through a
# <tt>has_one</tt> or <tt>belongs_to</tt> association on the join model.
# [:source]
# Specifies the source association name used by <tt>has_one :through</tt> queries. Only use it if the name cannot be
# inferred from the association. <tt>has_one :favorite, :through => :favorites</tt> will look for a
# <tt>:favorite</tt> on Favorite, unless a <tt>:source</tt> is given.
# [:source_type]
# Specifies type of the source association used by <tt>has_one :through</tt> queries where the source
# association is a polymorphic +belongs_to+.
# [:readonly]
# If true, the associated object is readonly through the association.
# [:validate]
# If false, don't validate the associated object when saving the parent object. +false+ by default.
# [:autosave]
# If true, always save the associated object or destroy it if marked for destruction, when saving the parent object.
# If false, never save or destroy the associated object.
# By default, only save the associated object if it's a new record.
# [:inverse_of]
# Specifies the name of the <tt>belongs_to</tt> association on the associated object that is the inverse of this <tt>has_one</tt>
# association. Does not work in combination with <tt>:through</tt> or <tt>:as</tt> options.
# See ActiveRecord::Associations::ClassMethods's overview on Bi-directional associations for more detail.
#
# Option examples:
# has_one :credit_card, :dependent => :destroy # destroys the associated credit card
# has_one :credit_card, :dependent => :nullify # updates the associated records foreign key value to NULL rather than destroying it
# has_one :last_comment, :class_name => "Comment", :order => "posted_on"
# has_one :project_manager, :class_name => "Person", :conditions => "role = 'project_manager'"
# has_one :attachment, :as => :attachable
# has_one :boss, :readonly => :true
# has_one :club, :through => :membership
# has_one :primary_address, :through => :addressables, :conditions => ["addressable.primary = ?", true], :source => :addressable
def has_one(association_id, options = {})
if options[:through]
reflection = create_has_one_through_reflection(association_id, options)
association_accessor_methods(reflection, ActiveRecord::Associations::HasOneThroughAssociation)
else
reflection = create_has_one_reflection(association_id, options)
association_accessor_methods(reflection, HasOneAssociation)
association_constructor_method(:build, reflection, HasOneAssociation)
association_constructor_method(:create, reflection, HasOneAssociation)
configure_dependency_for_has_one(reflection)
end
end
# Specifies a one-to-one association with another class. This method should only be used
# if this class contains the foreign key. If the other class contains the foreign key,
# then you should use +has_one+ instead. See also ActiveRecord::Associations::ClassMethods's overview
# on when to use +has_one+ and when to use +belongs_to+.
#
# Methods will be added for retrieval and query for a single associated object, for which
# this object holds an id:
#
# [association(force_reload = false)]
# Returns the associated object. +nil+ is returned if none is found.
# [association=(associate)]
# Assigns the associate object, extracts the primary key, and sets it as the foreign key.
# [build_association(attributes = {})]
# Returns a new object of the associated type that has been instantiated
# with +attributes+ and linked to this object through a foreign key, but has not yet been saved.
# [create_association(attributes = {})]
# Returns a new object of the associated type that has been instantiated
# with +attributes+, linked to this object through a foreign key, and that
# has already been saved (if it passed the validation).
#
# (+association+ is replaced with the symbol passed as the first argument, so
# <tt>belongs_to :author</tt> would add among others <tt>author.nil?</tt>.)
#
# === Example
#
# A Post class declares <tt>belongs_to :author</tt>, which will add:
# * <tt>Post#author</tt> (similar to <tt>Author.find(author_id)</tt>)
# * <tt>Post#author=(author)</tt> (similar to <tt>post.author_id = author.id</tt>)
# * <tt>Post#build_author</tt> (similar to <tt>post.author = Author.new</tt>)
# * <tt>Post#create_author</tt> (similar to <tt>post.author = Author.new; post.author.save; post.author</tt>)
# The declaration can also include an options hash to specialize the behavior of the association.
#
# === Options
#
# [:class_name]
# Specify the class name of the association. Use it only if that name can't be inferred
# from the association name. So <tt>has_one :author</tt> will by default be linked to the Author class, but
# if the real class name is Person, you'll have to specify it with this option.
# [:conditions]
# Specify the conditions that the associated object must meet in order to be included as a +WHERE+
# SQL fragment, such as <tt>authorized = 1</tt>.
# [:select]
# By default, this is <tt>*</tt> as in <tt>SELECT * FROM</tt>, but can be changed if, for example, you want to do a join
# but not include the joined columns. Do not forget to include the primary and foreign keys, otherwise it will raise an error.
# [:foreign_key]
# Specify the foreign key used for the association. By default this is guessed to be the name
# of the association with an "_id" suffix. So a class that defines a <tt>belongs_to :person</tt> association will use
# "person_id" as the default <tt>:foreign_key</tt>. Similarly, <tt>belongs_to :favorite_person, :class_name => "Person"</tt>
# will use a foreign key of "favorite_person_id".
# [:primary_key]
# Specify the method that returns the primary key of associated object used for the association. By default this is id.
# [:dependent]
# If set to <tt>:destroy</tt>, the associated object is destroyed when this object is. If set to
# <tt>:delete</tt>, the associated object is deleted *without* calling its destroy method. This option should not be specified when
# <tt>belongs_to</tt> is used in conjunction with a <tt>has_many</tt> relationship on another class because of the potential to leave
# orphaned records behind.
# [:counter_cache]
# Caches the number of belonging objects on the associate class through the use of +increment_counter+
# and +decrement_counter+. The counter cache is incremented when an object of this class is created and decremented when it's
# destroyed. This requires that a column named <tt>#{table_name}_count</tt> (such as +comments_count+ for a belonging Comment class)
# is used on the associate class (such as a Post class). You can also specify a custom counter cache column by providing
# a column name instead of a +true+/+false+ value to this option (e.g., <tt>:counter_cache => :my_custom_counter</tt>.)
# Note: Specifying a counter cache will add it to that model's list of readonly attributes using +attr_readonly+.
# [:include]
# Specify second-order associations that should be eager loaded when this object is loaded.
# [:polymorphic]
# Specify this association is a polymorphic association by passing +true+.
# Note: If you've enabled the counter cache, then you may want to add the counter cache attribute
# to the +attr_readonly+ list in the associated classes (e.g. <tt>class Post; attr_readonly :comments_count; end</tt>).
# [:readonly]
# If true, the associated object is readonly through the association.
# [:validate]
# If false, don't validate the associated objects when saving the parent object. +false+ by default.
# [:autosave]
# If true, always save the associated object or destroy it if marked for destruction, when saving the parent object.
# If false, never save or destroy the associated object.
# By default, only save the associated object if it's a new record.
# [:touch]
# If true, the associated object will be touched (the updated_at/on attributes set to now) when this record is either saved or
# destroyed. If you specify a symbol, that attribute will be updated with the current time instead of the updated_at/on attribute.
# [:inverse_of]
# Specifies the name of the <tt>has_one</tt> or <tt>has_many</tt> association on the associated object that is the inverse of this <tt>belongs_to</tt>
# association. Does not work in combination with the <tt>:polymorphic</tt> options.
# See ActiveRecord::Associations::ClassMethods's overview on Bi-directional associations for more detail.
#
# Option examples:
# belongs_to :firm, :foreign_key => "client_of"
# belongs_to :person, :primary_key => "name", :foreign_key => "person_name"
# belongs_to :author, :class_name => "Person", :foreign_key => "author_id"
# belongs_to :valid_coupon, :class_name => "Coupon", :foreign_key => "coupon_id",
# :conditions => 'discounts > #{payments_count}'
# belongs_to :attachable, :polymorphic => true
# belongs_to :project, :readonly => true
# belongs_to :post, :counter_cache => true
# belongs_to :company, :touch => true
# belongs_to :company, :touch => :employees_last_updated_at
def belongs_to(association_id, options = {})
reflection = create_belongs_to_reflection(association_id, options)
if reflection.options[:polymorphic]
association_accessor_methods(reflection, BelongsToPolymorphicAssociation)
else
association_accessor_methods(reflection, BelongsToAssociation)
association_constructor_method(:build, reflection, BelongsToAssociation)
association_constructor_method(:create, reflection, BelongsToAssociation)
end
add_counter_cache_callbacks(reflection) if options[:counter_cache]
add_touch_callbacks(reflection, options[:touch]) if options[:touch]
configure_dependency_for_belongs_to(reflection)
end
# Specifies a many-to-many relationship with another class. This associates two classes via an
# intermediate join table. Unless the join table is explicitly specified as an option, it is
# guessed using the lexical order of the class names. So a join between Developer and Project
# will give the default join table name of "developers_projects" because "D" outranks "P". Note that this precedence
# is calculated using the <tt><</tt> operator for String. This means that if the strings are of different lengths,
# and the strings are equal when compared up to the shortest length, then the longer string is considered of higher
# lexical precedence than the shorter one. For example, one would expect the tables "paper_boxes" and "papers"
# to generate a join table name of "papers_paper_boxes" because of the length of the name "paper_boxes",
# but it in fact generates a join table name of "paper_boxes_papers". Be aware of this caveat, and use the
# custom <tt>:join_table</tt> option if you need to.
#
# The join table should not have a primary key or a model associated with it. You must manually generate the
# join table with a migration such as this:
#
# class CreateDevelopersProjectsJoinTable < ActiveRecord::Migration
# def self.up
# create_table :developers_projects, :id => false do |t|
# t.integer :developer_id
# t.integer :project_id
# end
# end
#
# def self.down
# drop_table :developers_projects
# end
# end
#
# Deprecated: Any additional fields added to the join table will be placed as attributes when pulling records out through
# +has_and_belongs_to_many+ associations. Records returned from join tables with additional attributes will be marked as
# readonly (because we can't save changes to the additional attributes). It's strongly recommended that you upgrade any
# associations with attributes to a real join model (see introduction).
#
# Adds the following methods for retrieval and query:
#
# [collection(force_reload = false)]
# Returns an array of all the associated objects.
# An empty array is returned if none are found.
# [collection<<(object, ...)]
# Adds one or more objects to the collection by creating associations in the join table
# (<tt>collection.push</tt> and <tt>collection.concat</tt> are aliases to this method).
# Note that this operation instantly fires update sql without waiting for the save or update call on the
# parent object.
# [collection.delete(object, ...)]
# Removes one or more objects from the collection by removing their associations from the join table.
# This does not destroy the objects.
# [collection=objects]
# Replaces the collection's content by deleting and adding objects as appropriate.
# [collection_singular_ids]
# Returns an array of the associated objects' ids.
# [collection_singular_ids=ids]
# Replace the collection by the objects identified by the primary keys in +ids+.
# [collection.clear]
# Removes every object from the collection. This does not destroy the objects.
# [collection.empty?]
# Returns +true+ if there are no associated objects.
# [collection.size]
# Returns the number of associated objects.
# [collection.find(id)]
# Finds an associated object responding to the +id+ and that
# meets the condition that it has to be associated with this object.
# Uses the same rules as ActiveRecord::Base.find.
# [collection.exists?(...)]
# Checks whether an associated object with the given conditions exists.
# Uses the same rules as ActiveRecord::Base.exists?.
# [collection.build(attributes = {})]
# Returns a new object of the collection type that has been instantiated
# with +attributes+ and linked to this object through the join table, but has not yet been saved.
# [collection.create(attributes = {})]
# Returns a new object of the collection type that has been instantiated
# with +attributes+, linked to this object through the join table, and that has already been saved (if it passed the validation).
#
# (+collection+ is replaced with the symbol passed as the first argument, so
# <tt>has_and_belongs_to_many :categories</tt> would add among others <tt>categories.empty?</tt>.)
#
# === Example
#
# A Developer class declares <tt>has_and_belongs_to_many :projects</tt>, which will add:
# * <tt>Developer#projects</tt>
# * <tt>Developer#projects<<</tt>
# * <tt>Developer#projects.delete</tt>
# * <tt>Developer#projects=</tt>
# * <tt>Developer#project_ids</tt>
# * <tt>Developer#project_ids=</tt>
# * <tt>Developer#projects.clear</tt>
# * <tt>Developer#projects.empty?</tt>
# * <tt>Developer#projects.size</tt>
# * <tt>Developer#projects.find(id)</tt>
# * <tt>Developer#projects.exists?(...)</tt>
# * <tt>Developer#projects.build</tt> (similar to <tt>Project.new("project_id" => id)</tt>)
# * <tt>Developer#projects.create</tt> (similar to <tt>c = Project.new("project_id" => id); c.save; c</tt>)
# The declaration may include an options hash to specialize the behavior of the association.
#
# === Options
#
# [:class_name]
# Specify the class name of the association. Use it only if that name can't be inferred
# from the association name. So <tt>has_and_belongs_to_many :projects</tt> will by default be linked to the
# Project class, but if the real class name is SuperProject, you'll have to specify it with this option.
# [:join_table]
# Specify the name of the join table if the default based on lexical order isn't what you want.
# <b>WARNING:</b> If you're overwriting the table name of either class, the +table_name+ method
# MUST be declared underneath any +has_and_belongs_to_many+ declaration in order to work.
# [:foreign_key]
# Specify the foreign key used for the association. By default this is guessed to be the name
# of this class in lower-case and "_id" suffixed. So a Person class that makes a +has_and_belongs_to_many+ association
# to Project will use "person_id" as the default <tt>:foreign_key</tt>.
# [:association_foreign_key]
# Specify the foreign key used for the association on the receiving side of the association.
# By default this is guessed to be the name of the associated class in lower-case and "_id" suffixed.
# So if a Person class makes a +has_and_belongs_to_many+ association to Project,
# the association will use "project_id" as the default <tt>:association_foreign_key</tt>.
# [:conditions]
# Specify the conditions that the associated object must meet in order to be included as a +WHERE+
# SQL fragment, such as <tt>authorized = 1</tt>. Record creations from the association are scoped if a hash is used.
# <tt>has_many :posts, :conditions => {:published => true}</tt> will create published posts with <tt>@blog.posts.create</tt>
# or <tt>@blog.posts.build</tt>.
# [:order]
# Specify the order in which the associated objects are returned as an <tt>ORDER BY</tt> SQL fragment,
# such as <tt>last_name, first_name DESC</tt>
# [:uniq]
# If true, duplicate associated objects will be ignored by accessors and query methods.
# [:finder_sql]
# Overwrite the default generated SQL statement used to fetch the association with a manual statement
# [:counter_sql]
# Specify a complete SQL statement to fetch the size of the association. If <tt>:finder_sql</tt> is
# specified but not <tt>:counter_sql</tt>, <tt>:counter_sql</tt> will be generated by replacing <tt>SELECT ... FROM</tt> with <tt>SELECT COUNT(*) FROM</tt>.
# [:delete_sql]
# Overwrite the default generated SQL statement used to remove links between the associated
# classes with a manual statement.
# [:insert_sql]
# Overwrite the default generated SQL statement used to add links between the associated classes
# with a manual statement.
# [:extend]
# Anonymous module for extending the proxy, see "Association extensions".
# [:include]
# Specify second-order associations that should be eager loaded when the collection is loaded.
# [:group]
# An attribute name by which the result should be grouped. Uses the <tt>GROUP BY</tt> SQL-clause.
# [:having]
# Combined with +:group+ this can be used to filter the records that a <tt>GROUP BY</tt> returns. Uses the <tt>HAVING</tt> SQL-clause.
# [:limit]
# An integer determining the limit on the number of rows that should be returned.
# [:offset]
# An integer determining the offset from where the rows should be fetched. So at 5, it would skip the first 4 rows.
# [:select]
# By default, this is <tt>*</tt> as in <tt>SELECT * FROM</tt>, but can be changed if, for example, you want to do a join
# but not include the joined columns. Do not forget to include the primary and foreign keys, otherwise it will raise an error.
# [:readonly]
# If true, all the associated objects are readonly through the association.
# [:validate]
# If false, don't validate the associated objects when saving the parent object. +true+ by default.
# [:autosave]
# If true, always save the associated objects or destroy them if marked for destruction, when saving the parent object.
# If false, never save or destroy the associated objects.
# By default, only save associated objects that are new records.
#
# Option examples:
# has_and_belongs_to_many :projects
# has_and_belongs_to_many :projects, :include => [ :milestones, :manager ]
# has_and_belongs_to_many :nations, :class_name => "Country"
# has_and_belongs_to_many :categories, :join_table => "prods_cats"
# has_and_belongs_to_many :categories, :readonly => true
# has_and_belongs_to_many :active_projects, :join_table => 'developers_projects', :delete_sql =>
# 'DELETE FROM developers_projects WHERE active=1 AND developer_id = #{id} AND project_id = #{record.id}'
def has_and_belongs_to_many(association_id, options = {}, &extension)
reflection = create_has_and_belongs_to_many_reflection(association_id, options, &extension)
collection_accessor_methods(reflection, HasAndBelongsToManyAssociation)
# Don't use a before_destroy callback since users' before_destroy
# callbacks will be executed after the association is wiped out.
include Module.new {
class_eval <<-RUBY, __FILE__, __LINE__ + 1
def destroy # def destroy
super # super
#{reflection.name}.clear # posts.clear
end # end
RUBY
}
add_association_callbacks(reflection.name, options)
end
private
# Generates a join table name from two provided table names.
# The names in the join table names end up in lexicographic order.
#
# join_table_name("members", "clubs") # => "clubs_members"
# join_table_name("members", "special_clubs") # => "members_special_clubs"
def join_table_name(first_table_name, second_table_name)
if first_table_name < second_table_name
join_table = "#{first_table_name}_#{second_table_name}"
else
join_table = "#{second_table_name}_#{first_table_name}"
end
table_name_prefix + join_table + table_name_suffix
end
def association_accessor_methods(reflection, association_proxy_class)
define_method(reflection.name) do |*params|
force_reload = params.first unless params.empty?
association = association_instance_get(reflection.name)
if association.nil? || force_reload
association = association_proxy_class.new(self, reflection)
retval = force_reload ? reflection.klass.uncached { association.reload } : association.reload
if retval.nil? and association_proxy_class == BelongsToAssociation
association_instance_set(reflection.name, nil)
return nil
end
association_instance_set(reflection.name, association)
end
association.target.nil? ? nil : association
end
define_method("loaded_#{reflection.name}?") do
association = association_instance_get(reflection.name)
association && association.loaded?
end
define_method("#{reflection.name}=") do |new_value|
association = association_instance_get(reflection.name)
if association.nil? || association.target != new_value
association = association_proxy_class.new(self, reflection)
end
association.replace(new_value)
association_instance_set(reflection.name, new_value.nil? ? nil : association)
end
define_method("set_#{reflection.name}_target") do |target|
return if target.nil? and association_proxy_class == BelongsToAssociation
association = association_proxy_class.new(self, reflection)
association.target = target
association_instance_set(reflection.name, association)
end
end
def collection_reader_method(reflection, association_proxy_class)
define_method(reflection.name) do |*params|
force_reload = params.first unless params.empty?
association = association_instance_get(reflection.name)
unless association
association = association_proxy_class.new(self, reflection)
association_instance_set(reflection.name, association)
end
reflection.klass.uncached { association.reload } if force_reload
association
end
define_method("#{reflection.name.to_s.singularize}_ids") do
if send(reflection.name).loaded? || reflection.options[:finder_sql]
send(reflection.name).map(&:id)
else
if reflection.through_reflection && reflection.source_reflection.belongs_to?
through = reflection.through_reflection
primary_key = reflection.source_reflection.primary_key_name
send(through.name).select("DISTINCT #{through.quoted_table_name}.#{primary_key}").map!(&:"#{primary_key}")
else
send(reflection.name).select("#{reflection.quoted_table_name}.#{reflection.klass.primary_key}").except(:includes).map!(&:id)
end
end
end
end
def collection_accessor_methods(reflection, association_proxy_class, writer = true)
collection_reader_method(reflection, association_proxy_class)
if writer
define_method("#{reflection.name}=") do |new_value|
# Loads proxy class instance (defined in collection_reader_method) if not already loaded
association = send(reflection.name)
association.replace(new_value)
association
end
define_method("#{reflection.name.to_s.singularize}_ids=") do |new_value|
ids = (new_value || []).reject { |nid| nid.blank? }.map(&:to_i)
send("#{reflection.name}=", reflection.klass.find(ids).index_by(&:id).values_at(*ids))
end
end
end
def association_constructor_method(constructor, reflection, association_proxy_class)
define_method("#{constructor}_#{reflection.name}") do |*params|
attributees = params.first unless params.empty?
replace_existing = params[1].nil? ? true : params[1]
association = association_instance_get(reflection.name)
unless association
association = association_proxy_class.new(self, reflection)
association_instance_set(reflection.name, association)
end
if association_proxy_class == HasOneAssociation
association.send(constructor, attributees, replace_existing)
else
association.send(constructor, attributees)
end
end
end
def add_counter_cache_callbacks(reflection)
cache_column = reflection.counter_cache_column
method_name = "belongs_to_counter_cache_after_create_for_#{reflection.name}".to_sym
define_method(method_name) do
association = send(reflection.name)
association.class.increment_counter(cache_column, association.id) unless association.nil?
end
after_create(method_name)
method_name = "belongs_to_counter_cache_before_destroy_for_#{reflection.name}".to_sym
define_method(method_name) do
association = send(reflection.name)
association.class.decrement_counter(cache_column, association.id) unless association.nil?
end
before_destroy(method_name)
module_eval(
"#{reflection.class_name}.send(:attr_readonly,\"#{cache_column}\".intern) if defined?(#{reflection.class_name}) && #{reflection.class_name}.respond_to?(:attr_readonly)", __FILE__, __LINE__
)
end
def add_touch_callbacks(reflection, touch_attribute)
method_name = "belongs_to_touch_after_save_or_destroy_for_#{reflection.name}".to_sym
define_method(method_name) do
association = send(reflection.name)
if touch_attribute == true
association.touch unless association.nil?
else
association.touch(touch_attribute) unless association.nil?
end
end
after_save(method_name)
after_destroy(method_name)
end
# Creates before_destroy callback methods that nullify, delete or destroy
# has_many associated objects, according to the defined :dependent rule.
# If the association is marked as :dependent => :restrict, create a callback
# that prevents deleting entirely.
#
# See HasManyAssociation#delete_records. Dependent associations
# delete children, otherwise foreign key is set to NULL.
# See HasManyAssociation#delete_records. Dependent associations
# delete children if the option is set to :destroy or :delete_all, set the
# foreign key to NULL if the option is set to :nullify, and do not touch the
# child records if the option is set to :restrict.
#
# The +extra_conditions+ parameter, which is not used within the main
# Active Record codebase, is meant to allow plugins to define extra
# finder conditions.
def configure_dependency_for_has_many(reflection, extra_conditions = nil)
if reflection.options.include?(:dependent)
case reflection.options[:dependent]
when :destroy
method_name = "has_many_dependent_destroy_for_#{reflection.name}".to_sym
define_method(method_name) do
send(reflection.name).each do |o|
# No point in executing the counter update since we're going to destroy the parent anyway
counter_method = ('belongs_to_counter_cache_before_destroy_for_' + self.class.name.downcase).to_sym
if(o.respond_to? counter_method) then
class << o
self
end.send(:define_method, counter_method, Proc.new {})
end
o.destroy
end
end
before_destroy method_name
when :delete_all
before_destroy do |record|
self.class.send(:delete_all_has_many_dependencies,
record,
reflection.name,
reflection.klass,
reflection.dependent_conditions(record, self.class, extra_conditions))
end
when :nullify
before_destroy do |record|
self.class.send(:nullify_has_many_dependencies,
record,
reflection.name,
reflection.klass,
reflection.primary_key_name,
reflection.dependent_conditions(record, self.class, extra_conditions))
end
when :restrict
method_name = "has_many_dependent_restrict_for_#{reflection.name}".to_sym
define_method(method_name) do
unless send(reflection.name).empty?
raise DeleteRestrictionError.new(reflection)
end
end
before_destroy method_name
else
raise ArgumentError, "The :dependent option expects either :destroy, :delete_all, :nullify or :restrict (#{reflection.options[:dependent].inspect})"
end
end
end
# Creates before_destroy callback methods that nullify, delete or destroy
# has_one associated objects, according to the defined :dependent rule.
# If the association is marked as :dependent => :restrict, create a callback
# that prevents deleting entirely.
def configure_dependency_for_has_one(reflection)
if reflection.options.include?(:dependent)
name = reflection.options[:dependent]
method_name = :"has_one_dependent_#{name}_for_#{reflection.name}"
case name
when :destroy, :delete
class_eval <<-eoruby, __FILE__, __LINE__ + 1
def #{method_name}
association = #{reflection.name}
association.#{name} if association
end
eoruby
when :nullify
class_eval <<-eoruby, __FILE__, __LINE__ + 1
def #{method_name}
association = #{reflection.name}
association.update_attribute(#{reflection.primary_key_name.inspect}, nil) if association
end
eoruby
when :restrict
method_name = "has_one_dependent_restrict_for_#{reflection.name}".to_sym
define_method(method_name) do
unless send(reflection.name).nil?
raise DeleteRestrictionError.new(reflection)
end
end
before_destroy method_name
else
raise ArgumentError, "The :dependent option expects either :destroy, :delete, :nullify or :restrict (#{reflection.options[:dependent].inspect})"
end
before_destroy method_name
end
end
def configure_dependency_for_belongs_to(reflection)
if reflection.options.include?(:dependent)
name = reflection.options[:dependent]
unless [:destroy, :delete].include?(name)
raise ArgumentError, "The :dependent option expects either :destroy or :delete (#{reflection.options[:dependent].inspect})"
end
method_name = :"belongs_to_dependent_#{name}_for_#{reflection.name}"
class_eval <<-eoruby, __FILE__, __LINE__ + 1
def #{method_name}
association = #{reflection.name}
association.#{name} if association
end
eoruby
after_destroy method_name
end
end
def delete_all_has_many_dependencies(record, reflection_name, association_class, dependent_conditions)
association_class.delete_all(dependent_conditions)
end
def nullify_has_many_dependencies(record, reflection_name, association_class, primary_key_name, dependent_conditions)
association_class.update_all("#{primary_key_name} = NULL", dependent_conditions)
end
mattr_accessor :valid_keys_for_has_many_association
@@valid_keys_for_has_many_association = [
:class_name, :table_name, :foreign_key, :primary_key,
:dependent,
:select, :conditions, :include, :order, :group, :having, :limit, :offset,
:as, :through, :source, :source_type,
:uniq,
:finder_sql, :counter_sql,
:before_add, :after_add, :before_remove, :after_remove,
:extend, :readonly,
:validate, :inverse_of
]
def create_has_many_reflection(association_id, options, &extension)
options.assert_valid_keys(valid_keys_for_has_many_association)
options[:extend] = create_extension_modules(association_id, extension, options[:extend])
create_reflection(:has_many, association_id, options, self)
end
mattr_accessor :valid_keys_for_has_one_association
@@valid_keys_for_has_one_association = [
:class_name, :foreign_key, :remote, :select, :conditions, :order,
:include, :dependent, :counter_cache, :extend, :as, :readonly,
:validate, :primary_key, :inverse_of
]
def create_has_one_reflection(association_id, options)
options.assert_valid_keys(valid_keys_for_has_one_association)
create_reflection(:has_one, association_id, options, self)
end
def create_has_one_through_reflection(association_id, options)
options.assert_valid_keys(
:class_name, :foreign_key, :remote, :select, :conditions, :order, :include, :dependent, :counter_cache, :extend, :as, :through, :source, :source_type, :validate
)
create_reflection(:has_one, association_id, options, self)
end
mattr_accessor :valid_keys_for_belongs_to_association
@@valid_keys_for_belongs_to_association = [
:class_name, :primary_key, :foreign_key, :foreign_type, :remote, :select, :conditions,
:include, :dependent, :counter_cache, :extend, :polymorphic, :readonly,
:validate, :touch, :inverse_of
]
def create_belongs_to_reflection(association_id, options)
options.assert_valid_keys(valid_keys_for_belongs_to_association)
reflection = create_reflection(:belongs_to, association_id, options, self)
if options[:polymorphic]
reflection.options[:foreign_type] ||= reflection.class_name.underscore + "_type"
end
reflection
end
mattr_accessor :valid_keys_for_has_and_belongs_to_many_association
@@valid_keys_for_has_and_belongs_to_many_association = [
:class_name, :table_name, :join_table, :foreign_key, :association_foreign_key,
:select, :conditions, :include, :order, :group, :having, :limit, :offset,
:uniq,
:finder_sql, :counter_sql, :delete_sql, :insert_sql,
:before_add, :after_add, :before_remove, :after_remove,
:extend, :readonly,
:validate
]
def create_has_and_belongs_to_many_reflection(association_id, options, &extension)
options.assert_valid_keys(valid_keys_for_has_and_belongs_to_many_association)
options[:extend] = create_extension_modules(association_id, extension, options[:extend])
reflection = create_reflection(:has_and_belongs_to_many, association_id, options, self)
if reflection.association_foreign_key == reflection.primary_key_name
raise HasAndBelongsToManyAssociationForeignKeyNeeded.new(reflection)
end
reflection.options[:join_table] ||= join_table_name(undecorated_table_name(self.to_s), undecorated_table_name(reflection.class_name))
if connection.supports_primary_key? && (connection.primary_key(reflection.options[:join_table]) rescue false)
raise HasAndBelongsToManyAssociationWithPrimaryKeyError.new(reflection)
end
reflection
end
def add_association_callbacks(association_name, options)
callbacks = %w(before_add after_add before_remove after_remove)
callbacks.each do |callback_name|
full_callback_name = "#{callback_name}_for_#{association_name}"
defined_callbacks = options[callback_name.to_sym]
if options.has_key?(callback_name.to_sym)
class_inheritable_reader full_callback_name.to_sym
write_inheritable_attribute(full_callback_name.to_sym, [defined_callbacks].flatten)
else
write_inheritable_attribute(full_callback_name.to_sym, [])
end
end
end
def create_extension_modules(association_id, block_extension, extensions)
if block_extension
extension_module_name = "#{self.to_s.demodulize}#{association_id.to_s.camelize}AssociationExtension"
silence_warnings do
self.parent.const_set(extension_module_name, Module.new(&block_extension))
end
Array.wrap(extensions).push("#{self.parent}::#{extension_module_name}".constantize)
else
Array.wrap(extensions)
end
end
class JoinDependency # :nodoc:
attr_reader :joins, :reflections, :table_aliases
def initialize(base, associations, joins)
@joins = [JoinBase.new(base, joins)]
@associations = associations
@reflections = []
@base_records_hash = {}
@base_records_in_order = []
@table_aliases = Hash.new { |aliases, table| aliases[table] = 0 }
@table_aliases[base.table_name] = 1
build(associations)
end
def graft(*associations)
associations.each do |association|
join_associations.detect {|a| association == a} ||
build(association.reflection.name, association.find_parent_in(self), association.join_class)
end
self
end
def join_associations
@joins[1..-1].to_a
end
def join_base
@joins[0]
end
def count_aliases_from_table_joins(name)
# quoted_name should be downcased as some database adapters (Oracle) return quoted name in uppercase
quoted_name = join_base.active_record.connection.quote_table_name(name.downcase).downcase
join_sql = join_base.table_joins.to_s.downcase
join_sql.blank? ? 0 :
# Table names
join_sql.scan(/join(?:\s+\w+)?\s+#{quoted_name}\son/).size +
# Table aliases
join_sql.scan(/join(?:\s+\w+)?\s+\S+\s+#{quoted_name}\son/).size
end
def instantiate(rows)
rows.each_with_index do |row, i|
primary_id = join_base.record_id(row)
unless @base_records_hash[primary_id]
@base_records_in_order << (@base_records_hash[primary_id] = join_base.instantiate(row))
end
construct(@base_records_hash[primary_id], @associations, join_associations.dup, row)
end
remove_duplicate_results!(join_base.active_record, @base_records_in_order, @associations)
return @base_records_in_order
end
def remove_duplicate_results!(base, records, associations)
case associations
when Symbol, String
reflection = base.reflections[associations]
if reflection && reflection.collection?
records.each { |record| record.send(reflection.name).target.uniq! }
end
when Array
associations.each do |association|
remove_duplicate_results!(base, records, association)
end
when Hash
associations.keys.each do |name|
reflection = base.reflections[name]
parent_records = []
records.each do |record|
if descendant = record.send(reflection.name)
if reflection.collection?
parent_records.concat descendant.target.uniq
else
parent_records << descendant
end
end
end
remove_duplicate_results!(reflection.klass, parent_records, associations[name]) unless parent_records.empty?
end
end
end
protected
def build(associations, parent = nil, join_class = Arel::InnerJoin)
parent ||= @joins.last
case associations
when Symbol, String
reflection = parent.reflections[associations.to_s.intern] or
raise ConfigurationError, "Association named '#{ associations }' was not found; perhaps you misspelled it?"
@reflections << reflection
@joins << build_join_association(reflection, parent).with_join_class(join_class)
when Array
associations.each do |association|
build(association, parent, join_class)
end
when Hash
associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name|
build(name, parent, join_class)
build(associations[name], nil, join_class)
end
else
raise ConfigurationError, associations.inspect
end
end
def build_join_association(reflection, parent)
JoinAssociation.new(reflection, self, parent)
end
def construct(parent, associations, joins, row)
case associations
when Symbol, String
join = joins.detect{|j| j.reflection.name.to_s == associations.to_s && j.parent_table_name == parent.class.table_name }
raise(ConfigurationError, "No such association") if join.nil?
joins.delete(join)
construct_association(parent, join, row)
when Array
associations.each do |association|
construct(parent, association, joins, row)
end
when Hash
associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name|
join = joins.detect{|j| j.reflection.name.to_s == name.to_s && j.parent_table_name == parent.class.table_name }
raise(ConfigurationError, "No such association") if join.nil?
association = construct_association(parent, join, row)
joins.delete(join)
construct(association, associations[name], joins, row) if association
end
else
raise ConfigurationError, associations.inspect
end
end
def construct_association(record, join, row)
case join.reflection.macro
when :has_many, :has_and_belongs_to_many
collection = record.send(join.reflection.name)
collection.loaded
return nil if record.id.to_s != join.parent.record_id(row).to_s or row[join.aliased_primary_key].nil?
association = join.instantiate(row)
collection.target.push(association)
collection.__send__(:set_inverse_instance, association, record)
when :has_one
return if record.id.to_s != join.parent.record_id(row).to_s
return if record.instance_variable_defined?("@#{join.reflection.name}")
association = join.instantiate(row) unless row[join.aliased_primary_key].nil?
set_target_and_inverse(join, association, record)
when :belongs_to
return if record.id.to_s != join.parent.record_id(row).to_s or row[join.aliased_primary_key].nil?
association = join.instantiate(row)
set_target_and_inverse(join, association, record)
else
raise ConfigurationError, "unknown macro: #{join.reflection.macro}"
end
return association
end
def set_target_and_inverse(join, association, record)
association_proxy = record.send("set_#{join.reflection.name}_target", association)
association_proxy.__send__(:set_inverse_instance, association, record)
end
class JoinBase # :nodoc:
attr_reader :active_record, :table_joins
delegate :table_name, :column_names, :primary_key, :reflections, :sanitize_sql, :arel_engine, :to => :active_record
def initialize(active_record, joins = nil)
@active_record = active_record
@cached_record = {}
@table_joins = joins
end
def ==(other)
other.class == self.class &&
other.active_record == active_record &&
other.table_joins == table_joins
end
def aliased_prefix
"t0"
end
def aliased_primary_key
"#{aliased_prefix}_r0"
end
def aliased_table_name
active_record.table_name
end
def column_names_with_alias
unless defined?(@column_names_with_alias)
@column_names_with_alias = []
([primary_key] + (column_names - [primary_key])).each_with_index do |column_name, i|
@column_names_with_alias << [column_name, "#{aliased_prefix}_r#{i}"]
end
end
@column_names_with_alias
end
def extract_record(row)
column_names_with_alias.inject({}){|record, (cn, an)| record[cn] = row[an]; record}
end
def record_id(row)
row[aliased_primary_key]
end
def instantiate(row)
@cached_record[record_id(row)] ||= active_record.send(:instantiate, extract_record(row))
end
end
class JoinAssociation < JoinBase # :nodoc:
attr_reader :reflection, :parent, :aliased_table_name, :aliased_prefix, :aliased_join_table_name, :parent_table_name
delegate :options, :klass, :through_reflection, :source_reflection, :to => :reflection
def initialize(reflection, join_dependency, parent = nil)
reflection.check_validity!
if reflection.options[:polymorphic]
raise EagerLoadPolymorphicError.new(reflection)
end
super(reflection.klass)
@join_dependency = join_dependency
@parent = parent
@reflection = reflection
@aliased_prefix = "t#{ join_dependency.joins.size }"
@parent_table_name = parent.active_record.table_name
@aliased_table_name = aliased_table_name_for(table_name)
@join = nil
if reflection.macro == :has_and_belongs_to_many
@aliased_join_table_name = aliased_table_name_for(reflection.options[:join_table], "_join")
end
if [:has_many, :has_one].include?(reflection.macro) && reflection.options[:through]
@aliased_join_table_name = aliased_table_name_for(reflection.through_reflection.klass.table_name, "_join")
end
end
def ==(other)
other.class == self.class &&
other.reflection == reflection &&
other.parent == parent
end
def find_parent_in(other_join_dependency)
other_join_dependency.joins.detect do |join|
self.parent == join
end
end
def join_class
@join_class ||= Arel::InnerJoin
end
def with_join_class(join_class)
@join_class = join_class
self
end
def association_join
return @join if @join
aliased_table = Arel::Table.new(table_name, :as => @aliased_table_name, :engine => arel_engine)
parent_table = Arel::Table.new(parent.table_name, :as => parent.aliased_table_name, :engine => arel_engine)
@join = case reflection.macro
when :has_and_belongs_to_many
join_table = Arel::Table.new(options[:join_table], :as => aliased_join_table_name, :engine => arel_engine)
fk = options[:foreign_key] || reflection.active_record.to_s.foreign_key
klass_fk = options[:association_foreign_key] || klass.to_s.foreign_key
[
join_table[fk].eq(parent_table[reflection.active_record.primary_key]),
aliased_table[klass.primary_key].eq(join_table[klass_fk])
]
when :has_many, :has_one
if reflection.options[:through]
join_table = Arel::Table.new(through_reflection.klass.table_name, :as => aliased_join_table_name, :engine => arel_engine)
jt_foreign_key = jt_as_extra = jt_source_extra = jt_sti_extra = nil
first_key = second_key = as_extra = nil
if through_reflection.options[:as] # has_many :through against a polymorphic join
jt_foreign_key = through_reflection.options[:as].to_s + '_id'
jt_as_extra = join_table[through_reflection.options[:as].to_s + '_type'].eq(parent.active_record.base_class.name)
else
jt_foreign_key = through_reflection.primary_key_name
end
case source_reflection.macro
when :has_many
if source_reflection.options[:as]
first_key = "#{source_reflection.options[:as]}_id"
second_key = options[:foreign_key] || primary_key
as_extra = aliased_table["#{source_reflection.options[:as]}_type"].eq(source_reflection.active_record.base_class.name)
else
first_key = through_reflection.klass.base_class.to_s.foreign_key
second_key = options[:foreign_key] || primary_key
end
unless through_reflection.klass.descends_from_active_record?
jt_sti_extra = join_table[through_reflection.active_record.inheritance_column].eq(through_reflection.klass.sti_name)
end
when :belongs_to
first_key = primary_key
if reflection.options[:source_type]
second_key = source_reflection.association_foreign_key
jt_source_extra = join_table[reflection.source_reflection.options[:foreign_type]].eq(reflection.options[:source_type])
else
second_key = source_reflection.primary_key_name
end
end
[
[parent_table[parent.primary_key].eq(join_table[jt_foreign_key]), jt_as_extra, jt_source_extra, jt_sti_extra].reject{|x| x.blank? },
aliased_table[first_key].eq(join_table[second_key])
]
elsif reflection.options[:as]
id_rel = aliased_table["#{reflection.options[:as]}_id"].eq(parent_table[parent.primary_key])
type_rel = aliased_table["#{reflection.options[:as]}_type"].eq(parent.active_record.base_class.name)
[id_rel, type_rel]
else
foreign_key = options[:foreign_key] || reflection.active_record.name.foreign_key
[aliased_table[foreign_key].eq(parent_table[reflection.options[:primary_key] || parent.primary_key])]
end
when :belongs_to
[aliased_table[options[:primary_key] || reflection.klass.primary_key].eq(parent_table[options[:foreign_key] || reflection.primary_key_name])]
end
unless klass.descends_from_active_record?
sti_column = aliased_table[klass.inheritance_column]
sti_condition = sti_column.eq(klass.sti_name)
klass.descendants.each {|subclass| sti_condition = sti_condition.or(sti_column.eq(subclass.sti_name)) }
@join << sti_condition
end
[through_reflection, reflection].each do |ref|
if ref && ref.options[:conditions]
@join << interpolate_sql(sanitize_sql(ref.options[:conditions], aliased_table_name))
end
end
@join
end
def relation
aliased = Arel::Table.new(table_name, :as => @aliased_table_name, :engine => arel_engine)
if reflection.macro == :has_and_belongs_to_many
[Arel::Table.new(options[:join_table], :as => aliased_join_table_name, :engine => arel_engine), aliased]
elsif reflection.options[:through]
[Arel::Table.new(through_reflection.klass.table_name, :as => aliased_join_table_name, :engine => arel_engine), aliased]
else
aliased
end
end
def join_relation(joining_relation, join = nil)
joining_relation.joins(self.with_join_class(Arel::OuterJoin))
end
protected
def aliased_table_name_for(name, suffix = nil)
if @join_dependency.table_aliases[name].zero?
@join_dependency.table_aliases[name] = @join_dependency.count_aliases_from_table_joins(name)
end
if !@join_dependency.table_aliases[name].zero? # We need an alias
name = active_record.connection.table_alias_for "#{pluralize(reflection.name)}_#{parent_table_name}#{suffix}"
@join_dependency.table_aliases[name] += 1
if @join_dependency.table_aliases[name] == 1 # First time we've seen this name
# Also need to count the aliases from the table_aliases to avoid incorrect count
@join_dependency.table_aliases[name] += @join_dependency.count_aliases_from_table_joins(name)
end
table_index = @join_dependency.table_aliases[name]
name = name[0..active_record.connection.table_alias_length-3] + "_#{table_index}" if table_index > 1
else
@join_dependency.table_aliases[name] += 1
end
name
end
def pluralize(table_name)
ActiveRecord::Base.pluralize_table_names ? table_name.to_s.pluralize : table_name
end
def table_alias_for(table_name, table_alias)
"#{table_name} #{table_alias if table_name != table_alias}".strip
end
def table_name_and_alias
table_alias_for table_name, @aliased_table_name
end
def interpolate_sql(sql)
instance_eval("%@#{sql.gsub('@', '\@')}@", __FILE__, __LINE__)
end
end
end
end
end
end
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