check_constraint_exists?

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 1341
      def check_constraint_exists?(table_name, **options)
        if !options.key?(:name) && !options.key?(:expression)
          raise ArgumentError, "At least one of :name or :expression must be supplied"
        end
        check_constraint_for(table_name, **options).present?
      end