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Fix docs (closes #2491)

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2744 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
David Heinemeier Hansson 2005-10-26 13:05:48 +00:00
parent 475bd74168
commit a8eea0b04b
11 changed files with 56 additions and 55 deletions
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2
activerecord/lib/active_record/acts/list.rb
View file

@ -6,7 +6,7 @@ module ActiveRecord
base.extend(ClassMethods)
end
# This act provides the capabilities for sorting and reordering a number of objects in list.
# This act provides the capabilities for sorting and reordering a number of objects in a list.
# The class that has this specified needs to have a "position" column defined as an integer on
# the mapped database table.
#

26
activerecord/lib/active_record/acts/nested_set.rb
View file

@ -7,17 +7,17 @@ module ActiveRecord
end
# This acts provides Nested Set functionality. Nested Set is similiar to Tree, but with
# the added feature that you can select the children and all of it's descendants with
# the added feature that you can select the children and all of their descendents with
# a single query. A good use case for this is a threaded post system, where you want
# to display every reply to a comment without multiple selects.
#
# A google search for "Nested Set" should point you in the direction to explain the
# data base theory. I figured a bunch of this from
# database theory. I figured out a bunch of this from
# http://threebit.net/tutorials/nestedset/tutorial1.html
#
# Instead of picturing a leaf node structure with child pointing back to their parent,
# Instead of picturing a leaf node structure with children pointing back to their parent,
# the best way to imagine how this works is to think of the parent entity surrounding all
# of it's children, and it's parent surrounding it, etc. Assuming that they are lined up
# of its children, and its parent surrounding it, etc. Assuming that they are lined up
# horizontally, we store the left and right boundries in the database.
#
# Imagine:
@ -42,7 +42,7 @@ module ActiveRecord
# | |___________________________| |___________________________| |
# |___________________________________________________________________|
#
# The numbers represent the left and right boundries. The table them might
# The numbers represent the left and right boundries. The table then might
# look like this:
# ID | PARENT | LEFT | RIGHT | DATA
# 1 | 0 | 1 | 14 | root
@ -63,10 +63,10 @@ module ActiveRecord
# There are instance methods for all of these.
#
# The structure is good if you need to group things together; the downside is that
# keeping data integrity is a pain, and both adding and removing and entry
# keeping data integrity is a pain, and both adding and removing an entry
# require a full table write.
#
# This sets up a before_destroy trigger to prune the tree correctly if one of it's
# This sets up a before_destroy trigger to prune the tree correctly if one of its
# elements gets deleted.
#
module ClassMethods
@ -134,10 +134,10 @@ module ActiveRecord
end
# Added a child to this object in the tree. If this object hasn't been initialized,
# Adds a child to this object in the tree. If this object hasn't been initialized,
# it gets set up as a root node. Otherwise, this method will update all of the
# other elements in the tree and shift them to the right. Keeping everything
# balanaced.
# other elements in the tree and shift them to the right, keeping everything
# balanced.
def add_child( child )
self.reload
child.reload
@ -179,17 +179,17 @@ module ActiveRecord
return (self[right_col_name] - self[left_col_name] - 1)/2
end
# Returns a set of itself and all of it's nested children
# Returns a set of itself and all of its nested children
def full_set
self.class.find(:all, :conditions => "#{scope_condition} AND (#{left_col_name} BETWEEN #{self[left_col_name]} and #{self[right_col_name]})" )
end
# Returns a set of all of it's children and nested children
# Returns a set of all of its children and nested children
def all_children
self.class.find(:all, :conditions => "#{scope_condition} AND (#{left_col_name} > #{self[left_col_name]}) and (#{right_col_name} < #{self[right_col_name]})" )
end
# Returns a set of only this entries immediate children
# Returns a set of only this entry's immediate children
def direct_children
self.class.find(:all, :conditions => "#{scope_condition} and #{parent_column} = #{self.id}")
end

13
activerecord/lib/active_record/acts/tree.rb
View file

@ -6,8 +6,8 @@ module ActiveRecord
base.extend(ClassMethods)
end
# Specify this act if you want to model a tree structure by providing a parent association and an children
# association. This act assumes that requires that you have a foreign key column, which by default is called parent_id.
# Specify this act if you want to model a tree structure by providing a parent association and a children
# association. This act requires that you have a foreign key column, which by default is called parent_id.
#
# class Category < ActiveRecord::Base
# acts_as_tree :order => "name"
@ -30,13 +30,14 @@ module ActiveRecord
#
# In addition to the parent and children associations, the following instance methods are added to the class
# after specifying the act:
# * siblings: Return all the children of the parent excluding the current node ([ subchild2 ] when called from subchild1)
# * ancestors: Returns all the ancestors of the current node ([child1, root] when called from subchild2)
# * root: Returns the root of the current node (root when called from subchild2)
# * siblings : Returns all the children of the parent, excluding the current node ([ subchild2 ] when called from subchild1)
# * self_and_siblings : Returns all the children of the parent, including the current node ([ subchild1, subchild2 ] when called from subchild1)
# * ancestors : Returns all the ancestors of the current node ([child1, root] when called from subchild2)
# * root : Returns the root of the current node (root when called from subchild2)
module ClassMethods
# Configuration options are:
#
# * <tt>foreign_key</tt> - specifies the column name to use for track of the tree (default: parent_id)
# * <tt>foreign_key</tt> - specifies the column name to use for tracking of the tree (default: parent_id)
# * <tt>order</tt> - makes it possible to sort the children according to this SQL snippet.
# * <tt>counter_cache</tt> - keeps a count in a children_count column if set to true (default: false).
def acts_as_tree(options = {})

8
activerecord/lib/active_record/aggregations.rb
View file

@ -7,8 +7,8 @@ module ActiveRecord
# Active Record implements aggregation through a macro-like class method called +composed_of+ for representing attributes
# as value objects. It expresses relationships like "Account [is] composed of Money [among other things]" or "Person [is]
# composed of [an] address". Each call to the macro adds a description on how the value objects are created from the
# attributes of the entity object (when the entity is initialized either as a new object or from finding an existing)
# composed of [an] address". Each call to the macro adds a description of how the value objects are created from the
# attributes of the entity object (when the entity is initialized either as a new object or from finding an existing object)
# and how it can be turned back into attributes (when the entity is saved to the database). Example:
#
# class Customer < ActiveRecord::Base
@ -88,8 +88,8 @@ module ActiveRecord
# == Writing value objects
#
# Value objects are immutable and interchangeable objects that represent a given value, such as a Money object representing
# $5. Two Money objects both representing $5 should be equal (through methods such == and <=> from Comparable if ranking makes
# sense). This is unlike a entity objects where equality is determined by identity. An entity class such as Customer can
# $5. Two Money objects both representing $5 should be equal (through methods such as == and <=> from Comparable if ranking
# makes sense). This is unlike entity objects where equality is determined by identity. An entity class such as Customer can
# easily have two different objects that both have an address on Hyancintvej. Entity identity is determined by object or
# relational unique identifiers (such as primary keys). Normal ActiveRecord::Base classes are entity objects.
#

22
activerecord/lib/active_record/associations.rb
View file

@ -22,7 +22,7 @@ module ActiveRecord
# 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 was as Ruby's own attr*
# specialized according to the collection or association symbol and the options hash. It works much the same way as Ruby's own attr*
# methods. Example:
#
# class Project < ActiveRecord::Base
@ -80,7 +80,7 @@ module ActiveRecord
#
# === 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
# * 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 (new_record? == true).
# * If either of these saves fail (due to one of the objects being invalid) the assignment statement returns false and the assignment
# is cancelled.
@ -164,8 +164,8 @@ module ActiveRecord
#
# That'll add another join along the lines of: LEFT OUTER JOIN comments ON comments.post_id = posts.id. And we'll be down to 1 query.
# But that shouldn't fool you to think 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 its no
# catch-all for performance problems, but its a great way to cut down on the number of queries in a situation as the one described above.
# 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.
#
# Please note that limited eager loading with has_many and has_and_belongs_to_many associations is not compatible with describing conditions
# on these eager tables. This will work:
@ -240,10 +240,10 @@ module ActiveRecord
# * <tt>collection.find</tt> - finds an associated object according to the same rules as Base.find.
# * <tt>collection.build(attributes = {})</tt> - returns a new object of the collection type that has been instantiated
# with +attributes+ and linked to this object through a foreign key but has not yet been saved. *Note:* This only works if an
# associated object already exists, not if its nil!
# associated object already exists, not if it's nil!
# * <tt>collection.create(attributes = {})</tt> - returns a new object of the collection type that has been instantiated
# with +attributes+ and linked to this object through a foreign key and that has already been saved (if it passed the validation).
# *Note:* This only works if an associated object already exists, not if its nil!
# *Note:* This only works if an associated object already exists, not if it's nil!
#
# 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>)
@ -271,7 +271,7 @@ module ActiveRecord
# 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 foreign_key.
# * <tt>:dependent</tt> - if set to :destroy (or true) all the associated objects are destroyed
# alongside this object. Also accepts :nullify which will set the associated objects foriegn key
# alongside this object. Also accepts :nullify which will set the associated object's foreign key
# field to NULL.
# May not be set if :exclusively_dependent is also set.
# * <tt>:exclusively_dependent</tt> - if set to true all the associated object are deleted in one SQL statement without having their
@ -279,7 +279,7 @@ module ActiveRecord
# clean-up in before_destroy. The upside is that it's much faster, especially if there's a counter_cache involved.
# May not be set if :dependent is also set.
# * <tt>:finder_sql</tt> - specify a complete SQL statement to fetch the association. This is a good way to go for complex
# associations that depends on multiple tables. Note: When this option is used, +find_in_collection+ is _not_ added.
# associations that depend on multiple tables. Note: When this option is used, +find_in_collection+ is _not_ added.
# * <tt>:counter_sql</tt> - specify a complete SQL statement to fetch the size of the association. If +:finder_sql+ is
# specified but +:counter_sql+, +:counter_sql+ will be generated by replacing SELECT ... FROM with SELECT COUNT(*) FROM.
#
@ -369,7 +369,7 @@ module ActiveRecord
# sql fragment, such as "rank = 5".
# * <tt>:order</tt> - specify the order from which the associated object will be picked at the top. Specified as
# an "ORDER BY" sql fragment, such as "last_name, first_name DESC"
# * <tt>:dependent</tt> - if set to :destroy (or true) all the associated object is destroyed when this object is. Also
# * <tt>:dependent</tt> - if set to :destroy (or true) all the associated objects are destroyed when this object is. Also,
# association is assigned.
# * <tt>:foreign_key</tt> - 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"
@ -558,8 +558,8 @@ module ActiveRecord
# of this class in lower-case and "_id" suffixed. So a +Person+ class that makes a has_and_belongs_to_many association
# will use "person_id" as the default foreign_key.
# * <tt>:association_foreign_key</tt> - specify the association foreign key used for the association. By default this is
# guessed to be the name of the associated class in lower-case and "_id" suffixed. So the associated class is +Project+
# that makes a has_and_belongs_to_many association will use "project_id" as the default association foreign_key.
# guessed to be the name of the associated class in lower-case and "_id" suffixed. So if the associated class is +Project+,
# the has_and_belongs_to_many association will use "project_id" as the default association foreign_key.
# * <tt>:conditions</tt> - specify the conditions that the associated object must meet in order to be included as a "WHERE"
# sql fragment, such as "authorized = 1".
# * <tt>:order</tt> - specify the order in which the associated objects are returned as a "ORDER BY" sql fragment, such as "last_name, first_name DESC"

12
activerecord/lib/active_record/callbacks.rb
View file

@ -86,7 +86,7 @@ module ActiveRecord
#
# There are four types of callbacks accepted by the callback macros: Method references (symbol), callback objects,
# inline methods (using a proc), and inline eval methods (using a string). Method references and callback objects are the
# recommended approaches, inline methods using a proc is some times appropriate (such as for creating mix-ins), and inline
# recommended approaches, inline methods using a proc are sometimes appropriate (such as for creating mix-ins), and inline
# eval methods are deprecated.
#
# The method reference callbacks work by specifying a protected or private method available in the object, like this:
@ -153,7 +153,7 @@ module ActiveRecord
#
# == The after_find and after_initialize exceptions
#
# Because after_find and after_initialize is called for each object instantiated found by a finder, such as Base.find(:all), we've had
# Because after_find and after_initialize are called for each object found and instantiated by a finder, such as Base.find(:all), we've had
# to implement a simple performance constraint (50% more speed on a simple test case). Unlike all the other callbacks, after_find and
# after_initialize will only be run if an explicit implementation is defined (<tt>def after_find</tt>). In that case, all of the
# callback types will be called.
@ -263,10 +263,10 @@ module ActiveRecord
result
end
# Is called _before_ Base.save on existing objects that has a record.
# Is called _before_ Base.save on existing objects that have a record.
def before_update() end
# Is called _after_ Base.save on existing objects that has a record.
# Is called _after_ Base.save on existing objects that have a record.
def after_update() end
def update_with_callbacks #:nodoc:
@ -291,11 +291,11 @@ module ActiveRecord
def after_validation_on_create() end
# Is called _before_ Validations.validate (which is part of the Base.save call) on
# existing objects that has a record.
# existing objects that have a record.
def before_validation_on_update() end
# Is called _after_ Validations.validate (which is part of the Base.save call) on
# existing objects that has a record.
# existing objects that have a record.
def after_validation_on_update() end
def valid_with_callbacks #:nodoc:

8
activerecord/lib/active_record/fixtures.rb
View file

@ -20,7 +20,7 @@ end
# This type of fixture is in YAML format and the preferred default. YAML is a file format which describes data structures
# in a non-verbose, humanly-readable format. It ships with Ruby 1.8.1+.
#
# Unlike single-file fixtures, YAML fixtures are stored in a single file per model, which is place in the directory appointed
# Unlike single-file fixtures, YAML fixtures are stored in a single file per model, which are placed in the directory appointed
# by <tt>Test::Unit::TestCase.fixture_path=(path)</tt> (this is automatically configured for Rails, so you can just
# put your files in <your-rails-app>/test/fixtures/). The fixture file ends with the .yml file extension (Rails example:
# "<your-rails-app>/test/fixtures/web_sites.yml"). The format of a YAML fixture file looks like this:
@ -56,7 +56,7 @@ end
# = CSV fixtures
#
# Fixtures can also be kept in the Comma Separated Value format. Akin to YAML fixtures, CSV fixtures are stored
# in a single file, but, instead end with the .csv file extension (Rails example: "<your-rails-app>/test/fixtures/web_sites.csv")
# in a single file, but instead end with the .csv file extension (Rails example: "<your-rails-app>/test/fixtures/web_sites.csv")
#
# The format of this type of fixture file is much more compact than the others, but also a little harder to read by us
# humans. The first line of the CSV file is a comma-separated list of field names. The rest of the file is then comprised
@ -103,7 +103,7 @@ end
# = Using Fixtures
#
# Since fixtures are a testing construct, we use them in our unit and functional tests. There are two ways to use the
# fixtures, but first lets take a look at a sample unit test found:
# fixtures, but first let's take a look at a sample unit test found:
#
# require 'web_site'
#
@ -139,7 +139,7 @@ end
#
# As seen above, the data hash created from the YAML fixtures would have @web_sites["rubyonrails"]["url"] return
# "http://www.rubyonrails.org" and @web_sites["google"]["name"] would return "Google". The same fixtures, but loaded
# from a CSV fixture file would be accessible via @web_sites["web_site_1"]["name"] == "Ruby on Rails" and have the individual
# from a CSV fixture file, would be accessible via @web_sites["web_site_1"]["name"] == "Ruby on Rails" and have the individual
# fixtures available as instance variables @web_site_1 and @web_site_2.
#
# If you do not wish to use instantiated fixtures (usually for performance reasons) there are two options.

4
activerecord/lib/active_record/migration.rb
View file

@ -109,7 +109,7 @@ module ActiveRecord
# end
# end
#
# And some times you need to do something in SQL not abstracted directly by migrations:
# And sometimes you need to do something in SQL not abstracted directly by migrations:
#
# class MakeJoinUnique < ActiveRecord::Migration
# def self.up
@ -123,7 +123,7 @@ module ActiveRecord
#
# == Using the class after changing table
#
# Some times you'll want to add a column in a migration and populate it immediately after. In that case, you'll need
# Sometimes you'll want to add a column in a migration and populate it immediately after. In that case, you'll need
# to make a call to Base#reset_column_information in order to ensure that the class has the latest column data from
# after the new column was added. Example:
#

2
activerecord/lib/active_record/reflection.rb
View file

@ -34,7 +34,7 @@ module ActiveRecord
end
# Reflection allows you to interrogate Active Record classes and objects about their associations and aggregations.
# This information can for example be used in a form builder that took an Active Record object and created input
# This information can, for example, be used in a form builder that took an Active Record object and created input
# fields for all of the attributes depending on their type and displayed the associations to other objects.
#
# You can find the interface for the AggregateReflection and AssociationReflection classes in the abstract MacroReflection class.

4
activerecord/lib/active_record/transactions.rb
View file

@ -24,7 +24,7 @@ module ActiveRecord
# Transactions are protective blocks where SQL statements are only permanent if they can all succeed as one atomic action.
# The classic example is a transfer between two accounts where you can only have a deposit if the withdrawal succeeded and
# vice versa. Transaction enforce the integrity of the database and guards the data against program errors or database break-downs.
# vice versa. Transactions enforce the integrity of the database and guard the data against program errors or database break-downs.
# So basically you should use transaction blocks whenever you have a number of statements that must be executed together or
# not at all. Example:
#
@ -62,7 +62,7 @@ module ActiveRecord
#
# == Object-level transactions
#
# You can enable object-level transactions for Active Record objects, though. You do this by naming the each of the Active Records
# You can enable object-level transactions for Active Record objects, though. You do this by naming each of the Active Records
# that you want to enable object-level transactions for, like this:
#
# Account.transaction(david, mary) do

10
activerecord/lib/active_record/validations.rb
View file

@ -29,8 +29,8 @@ module ActiveRecord
# Adds an error to the base object instead of any particular attribute. This is used
# to report errors that doesn't tie to any specific attribute, but rather to the object
# as a whole. These error messages doesn't get prepended with any field name when iterating
# to report errors that don't tie to any specific attribute, but rather to the object
# as a whole. These error messages don't get prepended with any field name when iterating
# with each_full, so they should be complete sentences.
def add_to_base(msg)
add(:base, msg)
@ -359,7 +359,7 @@ module ActiveRecord
configuration = { :message => ActiveRecord::Errors.default_error_messages[:blank], :on => :save }
configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash)
# can't use validates_each here, because it cannot cope with non-existant attributes,
# can't use validates_each here, because it cannot cope with nonexistent attributes,
# while errors.add_on_empty can
attr_names.each do |attr_name|
send(validation_method(configuration[:on])) do |record|
@ -460,7 +460,7 @@ module ActiveRecord
# validates_uniqueness_of :user_name, :scope => "account_id"
# end
#
# When the record is created, a check is performed to make sure that no record exist in the database with the given value for the specified
# When the record is created, a check is performed to make sure that no record exists in the database with the given value for the specified
# attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself.
#
# Configuration options:
@ -565,7 +565,7 @@ module ActiveRecord
end
end
# Validates whether the associated object or objects are all themselves valid. Works with any kind of association.
# Validates whether the associated object or objects are all valid themselves. Works with any kind of association.
#
# class Book < ActiveRecord::Base
# has_many :pages