define_proxy_call

# File activemodel/lib/active_model/attribute_methods.rb, line 421
        def define_proxy_call(code_generator, name, proxy_target, parameters, *call_args, namespace))
          mangled_name = name
          unless NAME_COMPILABLE_REGEXP.match?(name)
            mangled_name = "__temp__#{name.unpack1("h*")}"
          end

          call_args.map!(&:inspect)
          call_args << parameters if parameters
          namespace = :"#{namespace}_#{proxy_target}_#{call_args.join("_")}}"

          code_generator.define_cached_method(name, as: mangled_name, namespace: namespace) do |batch|
            body = if CALL_COMPILABLE_REGEXP.match?(proxy_target)
              "self.#{proxy_target}(#{call_args.join(", ")})"
            else
              call_args.unshift(":'#{proxy_target}'")
              "send(#{call_args.join(", ")})"
            end

            modifier = parameters == FORWARD_PARAMETERS ? "ruby2_keywords " : ""

            batch <<
              "#{modifier}def #{mangled_name}(#{parameters || ''})" <<
              body <<
              "end"
          end
        end