如何从 ApplicationHelper 调用 ApplicationController 方法 [英] How to call ApplicationController methods from ApplicationHelper

问题描述

我想在视图中提供 csv 链接，并将 csv 生成代码放在 ApplicationHelper 中.但是我收到此错误:

I want to provide csv links in a view and I placed the csv generating code in ApplicationHelper. However I'm getting this error:

undefined method `send_data' for #<#<Class:0x0000010151c708>:0x0000010151a070>

参考:

send_data content, :type => "text/plain",
  :filename => filename,
  :disposition => 'attachment'

如果我将 csv 代码放在控制器中，它就可以正常工作.我希望使用帮助程序来避免为我想为其提供 csv 选项的每个控制器定义路由(我有一堆).我怎样才能让 send_data(和其他必要的方法)对帮助者可用?

If I place the csv code in a controller it works fine. I was hoping to use the helper to avoid having to define routes for every controller I want to provide csv options for (I have a bunch). How can I make send_data (and other necessary methods) available to the helper?

推荐答案

使用helper_method.

默认情况下，ApplicationController 中的方法只能在控制器内部访问.

Use helper_method.

By default, methods in ApplicationController are only accessible inside the Controllers.

向 ApplicationController 添加一个方法，并使用 helper_method 将其作为辅助方法公开:

Add a method to the ApplicationController and expose it as a helper method with helper_method:

class ApplicationController < ActionController::Base

  helper_method :foo

  def foo
    "bar"
  end

end

现在 foo 方法对控制器 和 视图都可以访问.

Now the foo method is accessible to both Controllers and Views.

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