在rails中，放置需要在任何地方可用的方法的正确位置 [英] in rails, where is right place to put methods that need to be available 'anywhere'

问题描述

我有很多实用工具方法(例如用于重新格式化或解析诸如字符串之类的简单对象的方法).

I have lots of little utility methods (such as for reformatting or parsing simple objects like strings) I have been putting in ApplicationHelper.

但是，显然模型中的类方法无法访问ApplicationHelper方法.

However, ApplicationHelper methods apparently cannot be accessed by class methods in a model.

有一个解决方法，可以在我的整个项目中使用:

There is a workaround, which is to sprinkle thoughout my project:

include ApplicationHelper # needed to use apphelper method in instance method
extend ApplicationHelper # needed to use apphelper method in class method

，它似乎有效.但这似乎是一种矛盾.

and it seems to work. But it seems like a kludge.

是否有放置实用程序方法的更好的地方，以便可以从我的项目中的任何位置访问它们-视图，控制器方法，模型实例方法，模型类方法?

Is there a better place to put utility methods so they can be accessed from anywhere in my project - view, controller method, model instance metho, model class method?

推荐答案

这是lib/的用途.我在lib/deefour.rb中有一个文件，

This is what lib/ is for. I have a file at lib/deefour.rb with

require "deefour/core_ext"

module Deefour; end

我在lib/deefour/helpers.rb

module Deefour
  module Helpers
    extend self

    def some_method
      # ...
    end
  end
end

和lib/deefour/core_ext.rb

class String
  def my_custom_string_method(str)
    # ...
  end
end

在config/initializers/deefour.rb我放入的

require "deefour"

在您的config/application.rb中，请确保您拥有

In your config/application.rb make sure you have

config.autoload_paths += Dir["#{config.root}/lib"]

最后，在ApplicationController (对于控制器)，ApplicationHelper (对于视图)中，以及我需要的其他地方(即特定我只是做

Finally, in ApplicationController (for controllers), ApplicationHelper (for views), and wherever else I need it (ie. a specific model here and there) I simply do

include ::Deefour::Helpers

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