从User.rb模型访问ApplicationHelper [英] Accessing ApplicationHelper from User.rb model

问题描述

以下一些不起作用的简单代码:

Here's some simple code that isn't working:

module ApplicationHelper
  def industries
    industries = ['Agriculture','Food', etc.]
  end
end

class User < ActiveRecord::Base
  include ApplicationHelper
  validates_inclusion_of :industries, :in => ApplicationHelper.industries
  ...
end

使用undefined method 'industries'运行用户操作时，此代码失败.您知道我怎样才能正确地引用帮助者(或者最好是行业)吗?

This code is failing when a user action is run with undefined method 'industries'. Do you know how I can reference the helper (or preferably just industries) the right way?

基于下面Mauricio的答案中的代码，如何在控制器和视图中访问INDUSTRIES?我在使行业无处不在时确实遇到了麻烦，但这确实需要针对我的应用程序.

Based on the code in Mauricio's answer below, how can INDUSTRIES be accessed in a controller and a view? I'm having real trouble making industries accessible everywhere, but it really needs to be for my application.

推荐答案

您应该从不执行此类操作.不应将ApplicationHelper包含在模型中.最好的解决方案是:

You should never do something like this. ApplicationHelper is not supposed to be included in a model. Best solution would be:

class User < ActiveRecord::Base
    INDUSTRIES = ['Agriculture','Food']
    validates_inclusion_of :industries, :in => INDUSTRIES
end

module ApplicationHelper
    def industries
        User::INDUSTRIES
    end
end

现在，您可以通过一种简单而又不错的方式来完成它.

And now you have it done in a simple and nice way.

编辑

您需要访问任何行业的任何地方:

Anywhere you need to access industries you should use:

User::INDUSTRIES

就是这样.

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