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module ActiveRecord
# = Active Record Belongs To Polymorphic Association
module Associations
class BelongsToPolymorphicAssociation < BelongsToAssociation #:nodoc:
def stale_target?
if @target && @target.persisted?
target_id = @target.send(@reflection.association_primary_key).to_s
foreign_key = @owner.send(@reflection.primary_key_name).to_s
target_type = @target.class.base_class.name
foreign_type = @owner.send(@reflection.options[:foreign_type]).to_s
target_id != foreign_key || target_type != foreign_type
else
false
end
end
private
def replace_keys(record)
super
@owner[@reflection.options[:foreign_type]] = record && record.class.base_class.name
end
def different_target?(record)
super || record.class != target_klass
end
def inverse_reflection_for(record)
@reflection.polymorphic_inverse_of(record.class)
end
def target_klass
type = @owner[@reflection.options[:foreign_type]]
type && type.constantize
end
def raise_on_type_mismatch(record)
# A polymorphic association cannot have a type mismatch, by definition
end
end
end
end
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