check_validity_of_inverse!

# File activerecord/lib/active_record/reflection.rb, line 233
      def check_validity_of_inverse!
        unless polymorphic?
          if has_inverse? && inverse_of.nil?
            raise InverseOfAssociationNotFoundError.new(self)
          end
          if has_inverse? && inverse_of == self
            raise InverseOfAssociationRecursiveError.new(self)
          end
        end
      end