diff options
Diffstat (limited to 'activerecord/lib/active_record/reflection.rb')
| -rw-r--r-- | activerecord/lib/active_record/reflection.rb | 150 |
1 files changed, 118 insertions, 32 deletions
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb index 6b5a592ee5..dab5a502a5 100644 --- a/activerecord/lib/active_record/reflection.rb +++ b/activerecord/lib/active_record/reflection.rb @@ -1,4 +1,5 @@ require 'thread' +require 'active_support/core_ext/string/filters' module ActiveRecord # = Active Record Reflection @@ -38,9 +39,9 @@ module ActiveRecord ar.aggregate_reflections = ar.aggregate_reflections.merge(name.to_s => reflection) end - # \Reflection enables interrogating of Active Record classes and objects - # about their associations and aggregations. This information can, - # for example, be used in a form builder that takes an Active Record object + # \Reflection enables the ability to examine the associations and aggregations of + # Active Record classes and objects. This information, for example, + # can be used in a form builder that takes an Active Record object # and creates input fields for all of the attributes depending on their type # and displays the associations to other objects. # @@ -62,7 +63,7 @@ module ActiveRecord # Returns a Hash of name of the reflection as the key and a AssociationReflection as the value. # - # Account.reflections # => {balance: AggregateReflection} + # Account.reflections # => {"balance" => AggregateReflection} # # @api public def reflections @@ -148,16 +149,19 @@ module ActiveRecord JoinKeys = Struct.new(:key, :foreign_key) # :nodoc: - def join_keys(assoc_klass) + def join_keys(association_klass) JoinKeys.new(foreign_key, active_record_primary_key) end - def source_macro - ActiveSupport::Deprecation.warn("ActiveRecord::Base.source_macro is deprecated and " \ - "will be removed without replacement.") - macro + def constraints + scope_chain.flatten + end + + def alias_candidate(name) + "#{plural_name}_#{name}" end end + # Base class for AggregateReflection and AssociationReflection. Objects of # AggregateReflection and AssociationReflection are returned by the Reflection::ClassMethods. # @@ -273,7 +277,7 @@ module ActiveRecord def initialize(name, scope, options, active_record) super @automatic_inverse_of = nil - @type = options[:as] && "#{options[:as]}_type" + @type = options[:as] && (options[:foreign_type] || "#{options[:as]}_type") @foreign_type = options[:foreign_type] || "#{name}_type" @constructable = calculate_constructable(macro, options) @association_scope_cache = {} @@ -283,7 +287,7 @@ module ActiveRecord def association_scope_cache(conn, owner) key = conn.prepared_statements if polymorphic? - key = [key, owner.read_attribute(@foreign_type)] + key = [key, owner._read_attribute(@foreign_type)] end @association_scope_cache[key] ||= @scope_lock.synchronize { @association_scope_cache[key] ||= yield @@ -339,13 +343,11 @@ module ActiveRecord return unless scope if scope.arity > 0 - ActiveSupport::Deprecation.warn \ - "The association scope '#{name}' is instance dependent (the scope " \ - "block takes an argument). Preloading happens before the individual " \ - "instances are created. This means that there is no instance being " \ - "passed to the association scope. This will most likely result in " \ - "broken or incorrect behavior. Joining, Preloading and eager loading " \ - "of these associations is deprecated and will be removed in the future." + raise ArgumentError, <<-MSG.squish + The association scope '#{name}' is instance dependent (the scope + block takes an argument). Preloading instance dependent scopes is + not supported. + MSG end end alias :check_eager_loadable! :check_preloadable! @@ -494,7 +496,7 @@ module ActiveRecord # returns either nil or the inverse association name that it finds. def automatic_inverse_of if can_find_inverse_of_automatically?(self) - inverse_name = ActiveSupport::Inflector.underscore(options[:as] || active_record.name).to_sym + inverse_name = ActiveSupport::Inflector.underscore(options[:as] || active_record.name.demodulize).to_sym begin reflection = klass._reflect_on_association(inverse_name) @@ -596,8 +598,8 @@ module ActiveRecord def belongs_to?; true; end - def join_keys(assoc_klass) - key = polymorphic? ? association_primary_key(assoc_klass) : association_primary_key + def join_keys(association_klass) + key = polymorphic? ? association_primary_key(association_klass) : association_primary_key JoinKeys.new(key, foreign_key) end @@ -693,6 +695,11 @@ module ActiveRecord @chain ||= begin a = source_reflection.chain b = through_reflection.chain + + if options[:source_type] + b[0] = PolymorphicReflection.new(b[0], self) + end + chain = a + b chain[0] = self # Use self so we don't lose the information from :source_type chain @@ -740,15 +747,8 @@ module ActiveRecord end end - def join_keys(assoc_klass) - source_reflection.join_keys(assoc_klass) - end - - # The macro used by the source association - def source_macro - ActiveSupport::Deprecation.warn("ActiveRecord::Base.source_macro is deprecated and " \ - "will be removed without replacement.") - source_reflection.source_macro + def join_keys(association_klass) + source_reflection.join_keys(association_klass) end # A through association is nested if there would be more than one join table @@ -783,7 +783,7 @@ module ActiveRecord 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 = [name.to_s.singularize, name].collect(&:to_sym).uniq names = names.find_all { |n| through_reflection.klass._reflect_on_association(n) } @@ -821,7 +821,11 @@ module ActiveRecord end if through_reflection.polymorphic? - raise HasManyThroughAssociationPolymorphicThroughError.new(active_record.name, self) + if has_one? + raise HasOneAssociationPolymorphicThroughError.new(active_record.name, self) + else + raise HasManyThroughAssociationPolymorphicThroughError.new(active_record.name, self) + end end if source_reflection.nil? @@ -843,6 +847,12 @@ module ActiveRecord check_validity_of_inverse! end + def constraints + scope_chain = source_reflection.constraints + scope_chain << scope if scope + scope_chain + end + protected def actual_source_reflection # FIXME: this is a horrible name @@ -865,5 +875,81 @@ module ActiveRecord delegate(*delegate_methods, to: :delegate_reflection) end + + class PolymorphicReflection < ThroughReflection # :nodoc: + def initialize(reflection, previous_reflection) + @reflection = reflection + @previous_reflection = previous_reflection + end + + def klass + @reflection.klass + end + + def scope + @reflection.scope + end + + def table_name + @reflection.table_name + end + + def plural_name + @reflection.plural_name + end + + def join_keys(association_klass) + @reflection.join_keys(association_klass) + end + + def type + @reflection.type + end + + def constraints + [source_type_info] + end + + def source_type_info + type = @previous_reflection.foreign_type + source_type = @previous_reflection.options[:source_type] + lambda { |object| where(type => source_type) } + end + end + + class RuntimeReflection < PolymorphicReflection # :nodoc: + attr_accessor :next + + def initialize(reflection, association) + @reflection = reflection + @association = association + end + + def klass + @association.klass + end + + def table_name + klass.table_name + end + + def constraints + @reflection.constraints + end + + def source_type_info + @reflection.source_type_info + end + + def alias_candidate(name) + "#{plural_name}_#{name}_join" + end + + def alias_name + Arel::Table.new(table_name) + end + + def all_includes; yield; end + end end end |