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cd9592959f
Currently `scope_chain` uses same array for building different `scope_chain` for different associations. During processing these arrays are sometimes mutated and because of in-place mutation the changed `scope_chain` impacts other reflections. Fix is to dup the value before adding to the `scope_chain`. Fixes #3882.
697 lines
23 KiB
Ruby
697 lines
23 KiB
Ruby
module ActiveRecord
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# = Active Record Reflection
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module Reflection # :nodoc:
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extend ActiveSupport::Concern
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included do
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class_attribute :reflections
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class_attribute :aggregate_reflections
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self.reflections = {}
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self.aggregate_reflections = {}
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end
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def self.create(macro, name, scope, options, ar)
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case macro
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when :has_many, :belongs_to, :has_one
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klass = options[:through] ? ThroughReflection : AssociationReflection
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when :composed_of
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klass = AggregateReflection
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end
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klass.new(macro, name, scope, options, ar)
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end
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def self.add_reflection(ar, name, reflection)
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ar.reflections = ar.reflections.merge(name => reflection)
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end
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def self.add_aggregate_reflection(ar, name, reflection)
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ar.aggregate_reflections = ar.aggregate_reflections.merge(name => reflection)
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end
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# \Reflection enables to interrogate Active Record classes and objects
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# about their associations and aggregations. This information can,
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# for example, be used in a form builder that takes an Active Record object
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# and creates input fields for all of the attributes depending on their type
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# and displays the associations to other objects.
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#
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# MacroReflection class has info for AggregateReflection and AssociationReflection
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# classes.
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module ClassMethods
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# Returns an array of AggregateReflection objects for all the aggregations in the class.
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def reflect_on_all_aggregations
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aggregate_reflections.values
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end
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# Returns the AggregateReflection object for the named +aggregation+ (use the symbol).
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#
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# Account.reflect_on_aggregation(:balance) # => the balance AggregateReflection
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#
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def reflect_on_aggregation(aggregation)
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aggregate_reflections[aggregation]
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end
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# Returns an array of AssociationReflection objects for all the
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# associations in the class. If you only want to reflect on a certain
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# association type, pass in the symbol (<tt>:has_many</tt>, <tt>:has_one</tt>,
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# <tt>:belongs_to</tt>) as the first parameter.
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#
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# Example:
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#
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# Account.reflect_on_all_associations # returns an array of all associations
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# Account.reflect_on_all_associations(:has_many) # returns an array of all has_many associations
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#
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def reflect_on_all_associations(macro = nil)
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association_reflections = reflections.values
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macro ? association_reflections.select { |reflection| reflection.macro == macro } : association_reflections
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end
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# Returns the AssociationReflection object for the +association+ (use the symbol).
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#
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# Account.reflect_on_association(:owner) # returns the owner AssociationReflection
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# Invoice.reflect_on_association(:line_items).macro # returns :has_many
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#
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def reflect_on_association(association)
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reflections[association]
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end
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# Returns an array of AssociationReflection objects for all associations which have <tt>:autosave</tt> enabled.
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def reflect_on_all_autosave_associations
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reflections.values.select { |reflection| reflection.options[:autosave] }
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end
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end
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# Base class for AggregateReflection and AssociationReflection. Objects of
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# AggregateReflection and AssociationReflection are returned by the Reflection::ClassMethods.
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#
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# MacroReflection
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# AggregateReflection
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# AssociationReflection
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# ThroughReflection
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class MacroReflection
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# Returns the name of the macro.
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#
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# <tt>composed_of :balance, class_name: 'Money'</tt> returns <tt>:balance</tt>
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# <tt>has_many :clients</tt> returns <tt>:clients</tt>
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attr_reader :name
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# Returns the macro type.
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#
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# <tt>composed_of :balance, class_name: 'Money'</tt> returns <tt>:composed_of</tt>
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# <tt>has_many :clients</tt> returns <tt>:has_many</tt>
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attr_reader :macro
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attr_reader :scope
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# Returns the hash of options used for the macro.
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#
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# <tt>composed_of :balance, class_name: 'Money'</tt> returns <tt>{ class_name: "Money" }</tt>
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# <tt>has_many :clients</tt> returns <tt>{}</tt>
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attr_reader :options
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attr_reader :active_record
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attr_reader :plural_name # :nodoc:
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def initialize(macro, name, scope, options, active_record)
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@macro = macro
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@name = name
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@scope = scope
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@options = options
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@active_record = active_record
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@klass = options[:class]
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@plural_name = active_record.pluralize_table_names ?
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name.to_s.pluralize : name.to_s
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end
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def autosave=(autosave)
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@automatic_inverse_of = false
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@options[:autosave] = autosave
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end
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# Returns the class for the macro.
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#
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# <tt>composed_of :balance, class_name: 'Money'</tt> returns the Money class
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# <tt>has_many :clients</tt> returns the Client class
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def klass
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@klass ||= class_name.constantize
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end
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# Returns the class name for the macro.
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#
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# <tt>composed_of :balance, class_name: 'Money'</tt> returns <tt>'Money'</tt>
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# <tt>has_many :clients</tt> returns <tt>'Client'</tt>
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def class_name
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@class_name ||= (options[:class_name] || derive_class_name).to_s
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end
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# Returns +true+ if +self+ and +other_aggregation+ have the same +name+ attribute, +active_record+ attribute,
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# and +other_aggregation+ has an options hash assigned to it.
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def ==(other_aggregation)
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super ||
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other_aggregation.kind_of?(self.class) &&
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name == other_aggregation.name &&
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other_aggregation.options &&
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active_record == other_aggregation.active_record
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end
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private
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def derive_class_name
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name.to_s.camelize
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end
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end
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# Holds all the meta-data about an aggregation as it was specified in the
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# Active Record class.
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class AggregateReflection < MacroReflection #:nodoc:
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def mapping
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mapping = options[:mapping] || [name, name]
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mapping.first.is_a?(Array) ? mapping : [mapping]
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end
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end
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# Holds all the meta-data about an association as it was specified in the
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# Active Record class.
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class AssociationReflection < MacroReflection #:nodoc:
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# Returns the target association's class.
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#
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# class Author < ActiveRecord::Base
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# has_many :books
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# end
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#
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# Author.reflect_on_association(:books).klass
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# # => Book
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#
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# <b>Note:</b> Do not call +klass.new+ or +klass.create+ to instantiate
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# a new association object. Use +build_association+ or +create_association+
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# instead. This allows plugins to hook into association object creation.
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def klass
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@klass ||= active_record.send(:compute_type, class_name)
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end
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attr_reader :type, :foreign_type
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def initialize(macro, name, scope, options, active_record)
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super
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@collection = :has_many == macro
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@automatic_inverse_of = nil
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@type = options[:as] && "#{options[:as]}_type"
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@foreign_type = options[:foreign_type] || "#{name}_type"
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@constructable = calculate_constructable(macro, options)
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end
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# Returns a new, unsaved instance of the associated class. +attributes+ will
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# be passed to the class's constructor.
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def build_association(attributes, &block)
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klass.new(attributes, &block)
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end
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def constructable? # :nodoc:
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@constructable
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end
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def table_name
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klass.table_name
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end
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def quoted_table_name
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klass.quoted_table_name
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end
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def join_table
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@join_table ||= options[:join_table] || derive_join_table
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end
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def foreign_key
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@foreign_key ||= options[:foreign_key] || derive_foreign_key
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end
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def primary_key_column
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klass.columns_hash[klass.primary_key]
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end
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def association_foreign_key
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@association_foreign_key ||= options[:association_foreign_key] || class_name.foreign_key
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end
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# klass option is necessary to support loading polymorphic associations
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def association_primary_key(klass = nil)
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options[:primary_key] || primary_key(klass || self.klass)
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end
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def active_record_primary_key
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@active_record_primary_key ||= options[:primary_key] || primary_key(active_record)
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end
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def counter_cache_column
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if options[:counter_cache] == true
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"#{active_record.name.demodulize.underscore.pluralize}_count"
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elsif options[:counter_cache]
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options[:counter_cache].to_s
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end
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end
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def check_validity!
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check_validity_of_inverse!
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end
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def check_validity_of_inverse!
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unless options[:polymorphic]
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if has_inverse? && inverse_of.nil?
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raise InverseOfAssociationNotFoundError.new(self)
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end
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end
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end
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def through_reflection
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nil
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end
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def source_reflection
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self
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end
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# A chain of reflections from this one back to the owner. For more see the explanation in
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# ThroughReflection.
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def chain
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[self]
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end
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def nested?
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false
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end
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# An array of arrays of scopes. Each item in the outside array corresponds to a reflection
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# in the #chain.
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def scope_chain
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scope ? [[scope]] : [[]]
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end
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alias :source_macro :macro
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def has_inverse?
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inverse_name
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end
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def inverse_of
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return unless inverse_name
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@inverse_of ||= klass.reflect_on_association inverse_name
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end
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def polymorphic_inverse_of(associated_class)
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if has_inverse?
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if inverse_relationship = associated_class.reflect_on_association(options[:inverse_of])
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inverse_relationship
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else
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raise InverseOfAssociationNotFoundError.new(self, associated_class)
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end
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end
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end
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# Returns whether or not this association reflection is for a collection
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# association. Returns +true+ if the +macro+ is either +has_many+ or
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# +has_and_belongs_to_many+, +false+ otherwise.
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def collection?
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@collection
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end
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# Returns whether or not the association should be validated as part of
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# the parent's validation.
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#
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# Unless you explicitly disable validation with
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# <tt>validate: false</tt>, validation will take place when:
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#
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# * you explicitly enable validation; <tt>validate: true</tt>
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# * you use autosave; <tt>autosave: true</tt>
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# * the association is a +has_many+ association
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def validate?
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!options[:validate].nil? ? options[:validate] : (options[:autosave] == true || macro == :has_many)
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end
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# Returns +true+ if +self+ is a +belongs_to+ reflection.
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def belongs_to?
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macro == :belongs_to
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end
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def association_class
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case macro
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when :belongs_to
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if options[:polymorphic]
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Associations::BelongsToPolymorphicAssociation
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else
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Associations::BelongsToAssociation
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end
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when :has_many
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if options[:through]
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Associations::HasManyThroughAssociation
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else
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Associations::HasManyAssociation
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end
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when :has_one
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if options[:through]
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Associations::HasOneThroughAssociation
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else
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Associations::HasOneAssociation
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end
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end
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end
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def polymorphic?
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options.key? :polymorphic
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end
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VALID_AUTOMATIC_INVERSE_MACROS = [:has_many, :has_one, :belongs_to]
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INVALID_AUTOMATIC_INVERSE_OPTIONS = [:conditions, :through, :polymorphic, :foreign_key]
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protected
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def actual_source_reflection # FIXME: this is a horrible name
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self
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end
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private
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def calculate_constructable(macro, options)
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case macro
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when :belongs_to
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!options[:polymorphic]
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when :has_one
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!options[:through]
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else
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true
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end
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end
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# Attempts to find the inverse association name automatically.
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# If it cannot find a suitable inverse association name, it returns
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# nil.
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def inverse_name
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options.fetch(:inverse_of) do
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if @automatic_inverse_of == false
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nil
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else
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@automatic_inverse_of ||= automatic_inverse_of
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end
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end
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end
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# returns either nil or the inverse association name that it finds.
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def automatic_inverse_of
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if can_find_inverse_of_automatically?(self)
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inverse_name = ActiveSupport::Inflector.underscore(active_record.name).to_sym
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begin
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reflection = klass.reflect_on_association(inverse_name)
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rescue NameError
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# Give up: we couldn't compute the klass type so we won't be able
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# to find any associations either.
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reflection = false
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end
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if valid_inverse_reflection?(reflection)
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return inverse_name
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end
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end
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false
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end
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# Checks if the inverse reflection that is returned from the
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# +automatic_inverse_of+ method is a valid reflection. We must
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# make sure that the reflection's active_record name matches up
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# with the current reflection's klass name.
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#
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# Note: klass will always be valid because when there's a NameError
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# from calling +klass+, +reflection+ will already be set to false.
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def valid_inverse_reflection?(reflection)
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reflection &&
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klass.name == reflection.active_record.name &&
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can_find_inverse_of_automatically?(reflection)
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end
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# Checks to see if the reflection doesn't have any options that prevent
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# us from being able to guess the inverse automatically. First, the
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# <tt>inverse_of</tt> option cannot be set to false. Second, we must
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# have <tt>has_many</tt>, <tt>has_one</tt>, <tt>belongs_to</tt> associations.
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# Third, we must not have options such as <tt>:polymorphic</tt> or
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# <tt>:foreign_key</tt> which prevent us from correctly guessing the
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# inverse association.
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#
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# Anything with a scope can additionally ruin our attempt at finding an
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# inverse, so we exclude reflections with scopes.
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def can_find_inverse_of_automatically?(reflection)
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reflection.options[:inverse_of] != false &&
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VALID_AUTOMATIC_INVERSE_MACROS.include?(reflection.macro) &&
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!INVALID_AUTOMATIC_INVERSE_OPTIONS.any? { |opt| reflection.options[opt] } &&
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!reflection.scope
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end
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def derive_class_name
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class_name = name.to_s.camelize
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class_name = class_name.singularize if collection?
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class_name
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end
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def derive_foreign_key
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if belongs_to?
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"#{name}_id"
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elsif options[:as]
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"#{options[:as]}_id"
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else
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active_record.name.foreign_key
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end
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end
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def derive_join_table
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[active_record.table_name, klass.table_name].sort.join("\0").gsub(/^(.*_)(.+)\0\1(.+)/, '\1\2_\3').gsub("\0", "_")
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end
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def primary_key(klass)
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klass.primary_key || raise(UnknownPrimaryKey.new(klass))
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end
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end
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# Holds all the meta-data about a :through association as it was specified
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# in the Active Record class.
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class ThroughReflection < AssociationReflection #:nodoc:
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delegate :foreign_key, :foreign_type, :association_foreign_key,
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:active_record_primary_key, :type, :to => :source_reflection
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def initialize(macro, name, scope, options, active_record)
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super
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@source_reflection_name = options[:source]
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end
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# Returns the source of the through reflection. It checks both a singularized
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# and pluralized form for <tt>:belongs_to</tt> or <tt>:has_many</tt>.
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#
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# class Post < ActiveRecord::Base
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# has_many :taggings
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# has_many :tags, through: :taggings
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# end
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#
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# class Tagging < ActiveRecord::Base
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# belongs_to :post
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# belongs_to :tag
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# end
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#
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# tags_reflection = Post.reflect_on_association(:tags)
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# tags_reflection.source_reflection
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# # => <ActiveRecord::Reflection::AssociationReflection: @macro=:belongs_to, @name=:tag, @active_record=Tagging, @plural_name="tags">
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#
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def source_reflection
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through_reflection.klass.reflect_on_association(source_reflection_name)
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end
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# Returns the AssociationReflection object specified in the <tt>:through</tt> option
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# of a HasManyThrough or HasOneThrough association.
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#
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# class Post < ActiveRecord::Base
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# has_many :taggings
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# has_many :tags, through: :taggings
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# end
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#
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# tags_reflection = Post.reflect_on_association(:tags)
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# tags_reflection.through_reflection
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# # => <ActiveRecord::Reflection::AssociationReflection: @macro=:has_many, @name=:taggings, @active_record=Post, @plural_name="taggings">
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#
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def through_reflection
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active_record.reflect_on_association(options[:through])
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end
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# Returns an array of reflections which are involved in this association. Each item in the
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# array corresponds to a table which will be part of the query for this association.
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#
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# The chain is built by recursively calling #chain on the source reflection and the through
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# reflection. The base case for the recursion is a normal association, which just returns
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# [self] as its #chain.
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#
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# class Post < ActiveRecord::Base
|
|
# has_many :taggings
|
|
# has_many :tags, through: :taggings
|
|
# end
|
|
#
|
|
# tags_reflection = Post.reflect_on_association(:tags)
|
|
# tags_reflection.chain
|
|
# # => [<ActiveRecord::Reflection::ThroughReflection: @macro=:has_many, @name=:tags, @options={:through=>:taggings}, @active_record=Post>,
|
|
# <ActiveRecord::Reflection::AssociationReflection: @macro=:has_many, @name=:taggings, @options={}, @active_record=Post>]
|
|
#
|
|
def chain
|
|
@chain ||= begin
|
|
a = source_reflection.chain
|
|
b = through_reflection.chain
|
|
chain = a + b
|
|
chain[0] = self # Use self so we don't lose the information from :source_type
|
|
chain
|
|
end
|
|
end
|
|
|
|
# Consider the following example:
|
|
#
|
|
# class Person
|
|
# has_many :articles
|
|
# has_many :comment_tags, through: :articles
|
|
# end
|
|
#
|
|
# class Article
|
|
# has_many :comments
|
|
# has_many :comment_tags, through: :comments, source: :tags
|
|
# end
|
|
#
|
|
# class Comment
|
|
# has_many :tags
|
|
# end
|
|
#
|
|
# There may be scopes on Person.comment_tags, Article.comment_tags and/or Comment.tags,
|
|
# but only Comment.tags will be represented in the #chain. So this method creates an array
|
|
# of scopes corresponding to the chain.
|
|
def scope_chain
|
|
@scope_chain ||= begin
|
|
scope_chain = source_reflection.scope_chain.map(&:dup)
|
|
|
|
# Add to it the scope from this reflection (if any)
|
|
scope_chain.first << scope if scope
|
|
|
|
through_scope_chain = through_reflection.scope_chain.map(&:dup)
|
|
|
|
if options[:source_type]
|
|
through_scope_chain.first <<
|
|
through_reflection.klass.where(foreign_type => options[:source_type])
|
|
end
|
|
|
|
# Recursively fill out the rest of the array from the through reflection
|
|
scope_chain + through_scope_chain
|
|
end
|
|
end
|
|
|
|
# The macro used by the source association
|
|
def source_macro
|
|
source_reflection.source_macro
|
|
end
|
|
|
|
# A through association is nested if there would be more than one join table
|
|
def nested?
|
|
chain.length > 2
|
|
end
|
|
|
|
# We want to use the klass from this reflection, rather than just delegate straight to
|
|
# the source_reflection, because the source_reflection may be polymorphic. We still
|
|
# need to respect the source_reflection's :primary_key option, though.
|
|
def association_primary_key(klass = nil)
|
|
# Get the "actual" source reflection if the immediate source reflection has a
|
|
# source reflection itself
|
|
actual_source_reflection.options[:primary_key] || primary_key(klass || self.klass)
|
|
end
|
|
|
|
# Gets an array of possible <tt>:through</tt> source reflection names in both singular and plural form.
|
|
#
|
|
# class Post < ActiveRecord::Base
|
|
# has_many :taggings
|
|
# has_many :tags, through: :taggings
|
|
# end
|
|
#
|
|
# tags_reflection = Post.reflect_on_association(:tags)
|
|
# tags_reflection.source_reflection_names
|
|
# # => [:tag, :tags]
|
|
#
|
|
def source_reflection_names
|
|
(options[:source] ? [options[:source]] : [name.to_s.singularize, name]).collect { |n| n.to_sym }.uniq
|
|
end
|
|
|
|
def source_reflection_name # :nodoc:
|
|
return @source_reflection_name if @source_reflection_name
|
|
|
|
names = [name.to_s.singularize, name].collect { |n| n.to_sym }.uniq
|
|
names = names.find_all { |n|
|
|
through_reflection.klass.reflect_on_association(n)
|
|
}
|
|
|
|
if names.length > 1
|
|
example_options = options.dup
|
|
example_options[:source] = source_reflection_names.first
|
|
ActiveSupport::Deprecation.warn <<-eowarn
|
|
Ambiguous source reflection for through association. Please specify a :source
|
|
directive on your declaration like:
|
|
|
|
class #{active_record.name} < ActiveRecord::Base
|
|
#{macro} :#{name}, #{example_options}
|
|
end
|
|
|
|
eowarn
|
|
end
|
|
|
|
@source_reflection_name = names.first
|
|
end
|
|
|
|
def source_options
|
|
source_reflection.options
|
|
end
|
|
|
|
def through_options
|
|
through_reflection.options
|
|
end
|
|
|
|
def check_validity!
|
|
if through_reflection.nil?
|
|
raise HasManyThroughAssociationNotFoundError.new(active_record.name, self)
|
|
end
|
|
|
|
if through_reflection.options[:polymorphic]
|
|
raise HasManyThroughAssociationPolymorphicThroughError.new(active_record.name, self)
|
|
end
|
|
|
|
if source_reflection.nil?
|
|
raise HasManyThroughSourceAssociationNotFoundError.new(self)
|
|
end
|
|
|
|
if options[:source_type] && source_reflection.options[:polymorphic].nil?
|
|
raise HasManyThroughAssociationPointlessSourceTypeError.new(active_record.name, self, source_reflection)
|
|
end
|
|
|
|
if source_reflection.options[:polymorphic] && options[:source_type].nil?
|
|
raise HasManyThroughAssociationPolymorphicSourceError.new(active_record.name, self, source_reflection)
|
|
end
|
|
|
|
if macro == :has_one && through_reflection.collection?
|
|
raise HasOneThroughCantAssociateThroughCollection.new(active_record.name, self, through_reflection)
|
|
end
|
|
|
|
check_validity_of_inverse!
|
|
end
|
|
|
|
protected
|
|
|
|
def actual_source_reflection # FIXME: this is a horrible name
|
|
source_reflection.actual_source_reflection
|
|
end
|
|
|
|
private
|
|
def derive_class_name
|
|
# get the class_name of the belongs_to association of the through reflection
|
|
options[:source_type] || source_reflection.class_name
|
|
end
|
|
end
|
|
end
|
|
end
|