check_validity!() public

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# File activerecord/lib/active_record/reflection.rb, line 249
      def check_validity!
        check_validity_of_inverse!

        if has_and_belongs_to_many? && association_foreign_key == foreign_key
          raise HasAndBelongsToManyAssociationForeignKeyNeeded.new(self)
        end
      end
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