method_missing

# File activerecord/lib/active_record/relation/delegation.rb, line 111
        def method_missing(method, *args, &block)
          if @klass.respond_to?(method)
            self.class.delegate_to_scoped_klass(method)
            scoping { @klass.public_send(method, *args, &block) }
          elsif @delegate_to_klass && @klass.respond_to?(method, true)
            ActiveSupport::Deprecation.warn                "Delegating missing #{method} method to #{@klass}. "                "Accessibility of private/protected class methods in :scope is deprecated and will be removed in Rails 6.0."
            @klass.send(method, *args, &block)
          elsif arel.respond_to?(method)
            ActiveSupport::Deprecation.warn                "Delegating #{method} to arel is deprecated and will be removed in Rails 6.0."
            arel.public_send(method, *args, &block)
          else
            super
          end
        end