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# frozen_string_literal: true
module ActiveRecord
module Associations
# = Active Record Belongs To Polymorphic Association
class BelongsToPolymorphicAssociation < BelongsToAssociation #:nodoc:
def klass
type = owner[reflection.foreign_type]
type.presence && type.constantize
end
def target_changed?
super || owner.saved_change_to_attribute?(reflection.foreign_type)
end
private
def replace_keys(record)
super
owner[reflection.foreign_type] = record ? record.class.polymorphic_name : nil
end
def different_target?(record)
super || record.class != klass
end
def inverse_reflection_for(record)
reflection.polymorphic_inverse_of(record.class)
end
def raise_on_type_mismatch!(record)
# A polymorphic association cannot have a type mismatch, by definition
end
def stale_state
foreign_key = super
foreign_key && [foreign_key.to_s, owner[reflection.foreign_type].to_s]
end
end
end
end