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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1212 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
136 lines
No EOL
5.5 KiB
Ruby
136 lines
No EOL
5.5 KiB
Ruby
module ActiveRecord
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module Reflection # :nodoc:
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def self.append_features(base)
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super
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base.extend(ClassMethods)
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base.class_eval do
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class << self
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alias_method :composed_of_without_reflection, :composed_of
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def composed_of_with_reflection(part_id, options = {})
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composed_of_without_reflection(part_id, options)
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write_inheritable_array "aggregations", [ AggregateReflection.new(:composed_of, part_id, options, self) ]
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end
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alias_method :composed_of, :composed_of_with_reflection
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end
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end
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for association_type in %w( belongs_to has_one has_many has_and_belongs_to_many )
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base.module_eval <<-"end_eval"
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class << self
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alias_method :#{association_type}_without_reflection, :#{association_type}
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def #{association_type}_with_reflection(association_id, options = {})
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#{association_type}_without_reflection(association_id, options)
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write_inheritable_array "associations", [ AssociationReflection.new(:#{association_type}, association_id, options, self) ]
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end
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alias_method :#{association_type}, :#{association_type}_with_reflection
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end
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end_eval
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end
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end
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# Reflection allows you to interrogate Active Record classes and objects about their associations and aggregations.
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# This information can for example be used in a form builder that took an Active Record object and created input
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# fields for all of the attributes depending on their type and displayed the associations to other objects.
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#
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# You can find the interface for the AggregateReflection and AssociationReflection classes in the abstract MacroReflection class.
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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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read_inheritable_attribute "aggregations"
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end
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# Returns the AggregateReflection object for the named +aggregation+ (use the symbol). Example:
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# Account.reflect_on_aggregation(:balance) # returns the balance AggregateReflection
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def reflect_on_aggregation(aggregation)
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reflect_on_all_aggregations.find { |reflection| reflection.name == aggregation } unless reflect_on_all_aggregations.nil?
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end
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# Returns an array of AssociationReflection objects for all the aggregations in the class.
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def reflect_on_all_associations
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read_inheritable_attribute "associations"
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end
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# Returns the AssociationReflection object for the named +aggregation+ (use the symbol). Example:
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# Account.reflect_on_association(:owner) # returns the owner AssociationReflection
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def reflect_on_association(association)
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reflect_on_all_associations.find { |reflection| reflection.name == association } unless reflect_on_all_associations.nil?
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end
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end
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# Abstract base class for AggregateReflection and AssociationReflection that describes the interface available for both of
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# those classes. Objects of AggregateReflection and AssociationReflection are returned by the Reflection::ClassMethods.
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class MacroReflection
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attr_reader :active_record
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def initialize(macro, name, options, active_record)
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@macro, @name, @options, @active_record = macro, name, options, active_record
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end
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# Returns the name of the macro, so it would return :balance for "composed_of :balance, :class_name => 'Money'" or
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# :clients for "has_many :clients".
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def name
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@name
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end
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# Returns the name of the macro, so it would return :composed_of for
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# "composed_of :balance, :class_name => 'Money'" or :has_many for "has_many :clients".
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def macro
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@macro
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end
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# Returns the hash of options used for the macro, so it would return { :class_name => "Money" } for
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# "composed_of :balance, :class_name => 'Money'" or {} for "has_many :clients".
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def options
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@options
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end
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# Returns the class for the macro, so "composed_of :balance, :class_name => 'Money'" would return the Money class and
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# "has_many :clients" would return the Client class.
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def klass() end
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def ==(other_aggregation)
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name == other_aggregation.name && other_aggregation.options && active_record == other_aggregation.active_record
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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 Active Record class.
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class AggregateReflection < MacroReflection #:nodoc:
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def klass
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Object.const_get(options[:class_name] || name_to_class_name(name.id2name))
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end
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private
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def name_to_class_name(name)
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name.capitalize.gsub(/_(.)/) { |s| $1.capitalize }
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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 Active Record class.
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class AssociationReflection < MacroReflection #:nodoc:
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def klass
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@klass ||= active_record.send(:compute_type, (name_to_class_name(name.id2name)))
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end
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def table_name
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@table_name ||= klass.table_name
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end
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private
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def name_to_class_name(name)
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if name !~ /::/
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class_name = active_record.send(
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:type_name_with_module,
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(options[:class_name] || active_record.class_name(active_record.table_name_prefix + name + active_record.table_name_suffix))
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)
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end
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return class_name || name
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end
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end
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end
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end |