diff options
Diffstat (limited to 'activerecord/lib/active_record/reflection.rb')
| -rw-r--r-- | activerecord/lib/active_record/reflection.rb | 53 |
1 files changed, 34 insertions, 19 deletions
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb index 0e48e229b3..a82e5d7ed1 100644 --- a/activerecord/lib/active_record/reflection.rb +++ b/activerecord/lib/active_record/reflection.rb @@ -1,12 +1,16 @@ module ActiveRecord + # = Active Record Reflection module Reflection # :nodoc: extend ActiveSupport::Concern - # 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 - # fields for all of the attributes depending on their type and displayed the associations to other objects. + # 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 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. + # You can find the interface for the AggregateReflection and AssociationReflection + # classes in the abstract MacroReflection class. module ClassMethods def create_reflection(macro, name, options, active_record) case macro @@ -43,8 +47,11 @@ module ActiveRecord reflections[aggregation].is_a?(AggregateReflection) ? reflections[aggregation] : nil end - # Returns an array of AssociationReflection objects for all the associations in the class. If you only want to reflect on a - # certain association type, pass in the symbol (<tt>:has_many</tt>, <tt>:has_one</tt>, <tt>:belongs_to</tt>) for that as the first parameter. + # Returns an array of AssociationReflection objects for all the + # associations in the class. If you only want to reflect on a certain + # association type, pass in the symbol (<tt>:has_many</tt>, <tt>:has_one</tt>, + # <tt>:belongs_to</tt>) for that as the first parameter. + # # Example: # # Account.reflect_on_all_associations # returns an array of all associations @@ -71,8 +78,9 @@ module ActiveRecord end - # Abstract base class for AggregateReflection and AssociationReflection that describes the interface available for both of - # those classes. Objects of AggregateReflection and AssociationReflection are returned by the Reflection::ClassMethods. + # Abstract base class for AggregateReflection and AssociationReflection that + # describes the interface available for both of those classes. Objects of + # AggregateReflection and AssociationReflection are returned by the Reflection::ClassMethods. class MacroReflection attr_reader :active_record @@ -80,13 +88,15 @@ module ActiveRecord @macro, @name, @options, @active_record = macro, name, options, active_record end - # Returns the name of the macro. For example, <tt>composed_of :balance, :class_name => 'Money'</tt> will return - # <tt>:balance</tt> or for <tt>has_many :clients</tt> it will return <tt>:clients</tt>. + # Returns the name of the macro. For example, <tt>composed_of :balance, + # :class_name => 'Money'</tt> will return <tt>:balance</tt> or for + # <tt>has_many :clients</tt> it will return <tt>:clients</tt>. def name @name end - # Returns the macro type. For example, <tt>composed_of :balance, :class_name => 'Money'</tt> will return <tt>:composed_of</tt> + # Returns the macro type. For example, + # <tt>composed_of :balance, :class_name => 'Money'</tt> will return <tt>:composed_of</tt> # or for <tt>has_many :clients</tt> will return <tt>:has_many</tt>. def macro @macro @@ -132,11 +142,13 @@ module ActiveRecord end - # Holds all the meta-data about an aggregation as it was specified in the Active Record class. + # Holds all the meta-data about an aggregation as it was specified in the + # Active Record class. class AggregateReflection < MacroReflection #:nodoc: end - # Holds all the meta-data about an association as it was specified in the Active Record class. + # Holds all the meta-data about an association as it was specified in the + # Active Record class. class AssociationReflection < MacroReflection #:nodoc: # Returns the target association's class: # @@ -165,14 +177,14 @@ module ActiveRecord klass.new(*options) end - # Creates a new instance of the associated class, and immediates saves it + # Creates a new instance of the associated class, and immediately saves it # with ActiveRecord::Base#save. +options+ will be passed to the class's # creation method. Returns the newly created object. def create_association(*options) klass.create(*options) end - # Creates a new instance of the associated class, and immediates saves it + # Creates a new instance of the associated class, and immediately saves it # with ActiveRecord::Base#save!. +options+ will be passed to the class's # creation method. If the created record doesn't pass validations, then an # exception will be raised. @@ -267,10 +279,10 @@ module ActiveRecord # Returns whether or not the association should be validated as part of # the parent's validation. # - # Unless you explicitely disable validation with + # Unless you explicitly disable validation with # <tt>:validate => false</tt>, it will take place when: # - # * you explicitely enable validation; <tt>:validate => true</tt> + # * you explicitly enable validation; <tt>:validate => true</tt> # * you use autosave; <tt>:autosave => true</tt> # * the association is a +has_many+ association def validate? @@ -306,9 +318,12 @@ module ActiveRecord end end - # Holds all the meta-data about a :through association as it was specified in the Active Record class. + # Holds all the meta-data about a :through association as it was specified + # in the Active Record class. class ThroughReflection < AssociationReflection #:nodoc: - # Gets the source of the through reflection. It checks both a singularized and pluralized form for <tt>:belongs_to</tt> or <tt>:has_many</tt>. + # Gets the source of the through reflection. It checks both a singularized + # and pluralized form for <tt>:belongs_to</tt> or <tt>:has_many</tt>. + # # (The <tt>:tags</tt> association on Tagging below.) # # class Post < ActiveRecord::Base |