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module ActiveRecord #:nodoc:
module Reflection #:nodoc:
module ClassMethods #:nodoc:
# Update the default reflection switch so that <tt>:has_many_polymorphs</tt> types get instantiated.
# It's not a composed method so we have to override the whole thing.
def create_reflection(macro, name, options, active_record)
case macro
when :has_many, :belongs_to, :has_one, :has_and_belongs_to_many
klass = options[:through] ? ThroughReflection : AssociationReflection
reflection = klass.new(macro, name, options, active_record)
when :composed_of
reflection = AggregateReflection.new(macro, name, options, active_record)
# added by has_many_polymorphs #
when :has_many_polymorphs
reflection = PolymorphicReflection.new(macro, name, options, active_record)
end
write_inheritable_hash :reflections, name => reflection
reflection
end
end
class PolymorphicError < ActiveRecordError #:nodoc:
end
=begin rdoc
The reflection built by the <tt>has_many_polymorphs</tt> method.
Inherits from ActiveRecord::Reflection::AssociationReflection.
=end
class PolymorphicReflection < ThroughReflection
# Stub out the validity check. Has_many_polymorphs checks validity on macro creation, not on reflection.
def check_validity!
# nothing
end
# Return the source reflection.
def source_reflection
# normally is the has_many to the through model, but we return ourselves,
# since there isn't a real source class for a polymorphic target
self
end
# Set the classname of the target. Uses the join class name.
def class_name
# normally is the classname of the association target
@class_name ||= options[:join_class_name]
end
end
end
end
Version data entries
22 entries across 22 versions & 5 rubygems