为什么我的Rails可挂载引擎不能正确加载帮助程序方法？ [英] Why is my Rails mountable engine not loading helper methods correctly?

问题描述

引擎的作用范围是它自己的命名空间。

在引擎中，有一个 MyEngine :: ApplicationHelper 模块，它添加了一堆视图帮助器方法。

在我的应用程序布局中，我引用了其中的一些方法。

当我第一次以开发模式加载任何页面时，我得到一个 NoMethodError ，抱怨该方法（在gem的 ApplicationHelper 中定义）不存在。

一旦我在我的应用程序中编辑 ApplicationController ，问题就会自行解决。

有些东西告诉我这是直至最近Rails自动加载的变化;我使用的是Rails 3.2.2

我不能为我的生活找出为什么这不能正常工作：/ $ / b

解决方案

我认为Rails指南有答案 here 。

要在您的应用中包含引擎中的特定助手：

  class ApplicationController< ActionController :: Base 
 helper MyEngine :: ApplicationHelper 
 end 
  

包含全部

  class ApplicationController< ActionController :: Base 
 helper MyEngine :: Engine.helpers 
 end 
  

I've built a rails gem that mounts as an engine.

The engine is scoped to it's own namespace.

In the engine, there's an MyEngine::ApplicationHelper module which adds a bunch of view helper methods.

In my application layout, I refer to some of these methods.

When I first load any of the pages in development mode I get a NoMethodError, complaining that the method (defined in the gem's ApplicationHelper) doesn't exist.

Once I edit ApplicationController within my app, the problem corrects itself.

Something tells me this is down to the recent changes in Rails's auto-loading; I'm using Rails 3.2.2

I can't for the life of me work out why this isn't working properly though :/

解决方案

I think the Rails guides has the answer here.

To include that particular helper from your Engine in your app:

class ApplicationController < ActionController::Base
  helper MyEngine::ApplicationHelper
end

To include all helpers from your Engine in your app:

class ApplicationController < ActionController::Base
  helper MyEngine::Engine.helpers
end

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