列出Rails控制器实例变量 [英] list Rails controller instance variables

问题描述

我试图列出控制器内部的实例变量，但想出了

i was trying to list the instance variables inside a controller but came up with

irb>HomeController.instance_variable_names
=> ["@visible_actions", "@inheritable_attributes", "@controller_path", "@action_methods", "@_process_action_callbacks"]

我在动作上尝试过

irb>HomeController.action("index").instance_variable_names
=> []

那么控制器实例变量属于什么?

so what do controller Instance variables belong to?

推荐答案

实例变量属于实例化的控制器对象，并且仅在执行action方法时创建.试试这个:

The instance variables belong to the instantiated controller object, and are only created when the action method has executed. Try this:

irb>instantiated_controller = HomeController.new
irb>instantiated_controller.index
irb>instantiated_controller.instance_variable_names
=> ["@_status", "@_headers", ...

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