instance method method_missing

# File activerecord/lib/active_record/attribute_methods.rb, line 475
      def method_missing(name, ...)
        # We can't know whether some method was defined or not because
        # multiple thread might be concurrently be in this code path.
        # So the first one would define the methods and the others would
        # appear to already have them.
        self.class.define_attribute_methods

        # So in all cases we must behave as if the method was just defined.
        method = begin
          self.class.public_instance_method(name)
        rescue NameError
          nil
        end

        # The method might be explicitly defined in the model, but call a generated
        # method with super. So we must resume the call chain at the right step.
        method = method.super_method while method && !method.owner.is_a?(GeneratedAttributeMethods)
        if method
          method.bind_call(self, ...)
        else
          super
        end
      end