Rails：助手内的控制器方法或实例变量

发布于 2024-12-06 14:59:07 字数 659 浏览 2 评论 0原文

我正在使用 bitly gem，并且希望能够访问我的辅助方法中的 bitly API（视图和邮件程序调用这些 API 来生成 URL）。

我在我的 ApplicationController 中的这个方法中启动了一个 API 连接：（

顺便说一句，有更合适的地方来执行此操作吗？）

class ApplicationController < ActionController::Base
  before_filter :bitly_connect

  def bitly_connect
    Bitly.use_api_version_3
    @bitly ||= Bitly.new(APP_CONFIG['bitly_username'], APP_CONFIG['bitly_api_key'] )
  end
end

默认情况下，我无权访问我的助手中的 @bitly 。您能建议一种方法来实现这一目标吗？

我发现的唯一相关线程没有帮助：助手内的 Rails 3 和控制器实例变量

谢谢。

原文

I'm using the bitly gem and would like to have access to the bitly API inside my helper methods (which get called by views and mailers to generate URLs).

I initiate an API connection in this method in my ApplicationController:

(is there a more appropriate place to do this BTW?)

class ApplicationController < ActionController::Base
  before_filter :bitly_connect

  def bitly_connect
    Bitly.use_api_version_3
    @bitly ||= Bitly.new(APP_CONFIG['bitly_username'], APP_CONFIG['bitly_api_key'] )
  end
end

By default I don't have access to @bitly in my helpers. Can you suggest a way to accomplish that?

The only related thread I found wasn't helpful:
Rails 3 and Controller Instance Variables Inside a Helper

Thanks.

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零時差 2024-12-13 14:59:07

按照惯例，Rails 将控制器操作（和过滤器）中设置的实例变量传递到视图。辅助方法在这些视图中可用，并且应该可以访问您在控制器操作中设置的实例变量。

或者，您可以通过将变量传递给方法或使用 Object#instance_variable_get 方法在辅助方法中设置局部变量： http://ruby-doc.org/core/classes/Object.html#M001028

# app/controllers/example_controller.rb
class ExampleController
  def index
    @instance_variable = 'foo'
  end
end

# app/helpers/example_helper.rb
module ExampleHelper
  def foo
    # instance variables set in the controller actions can be accessed here
    @instance_variable # => 'foo'
    # alternately using instance_variable_get
    variable = instance_variable_get(:@instance_variable)
    variable # => 'foo'
  end
end

至于您对逻辑放置的担忧，它看起来它不属于控制器。将控制器视为应用程序的路由请求。大多数逻辑应该在模型类内部执行。 “瘦控制器，胖模型。”：http://weblog。 jamisbuck.org/2006/10/18/skinny-controller-fat-model

Rails by convention passes instance variables set in the controller actions (and filters) along to the views. The helper methods are available in these views, and should have access to the instance variables you set inside your controller action.

Alternately, you can set a local variable inside your helper method by passing the variable to the method, or by using the Object#instance_variable_get method: http://ruby-doc.org/core/classes/Object.html#M001028

# app/controllers/example_controller.rb
class ExampleController
  def index
    @instance_variable = 'foo'
  end
end

# app/helpers/example_helper.rb
module ExampleHelper
  def foo
    # instance variables set in the controller actions can be accessed here
    @instance_variable # => 'foo'
    # alternately using instance_variable_get
    variable = instance_variable_get(:@instance_variable)
    variable # => 'foo'
  end
end

As for your concerns with the placement of the logic, it does not look like it belongs in the controller. Think of the controller as routing requests for your application. Most logic should be performed inside of your model classes. "Skinny controller, fat model.": http://weblog.jamisbuck.org/2006/10/18/skinny-controller-fat-model

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↙温凉少女 2024-12-13 14:59:07

如果您需要一个控制器方法作为助手进行访问，您可以使用 helper_method

class ApplicationController < ActionController::Base
  helper_method :bitly_connect

  def bitly_connect
    @bitly ||= begin
      Bitly.use_api_version_3
      Bitly.new(APP_CONFIG['bitly_username'], APP_CONFIG['bitly_api_key'] )
    end
  end
end

请注意，我还更改了该方法，以便每次调用时都不会调用 Bitly.use_api_version_3。

正如本·辛普森（Ben Simpson）指出的那样，您可能应该将其移至模型中。

If you need a controller method to be accessible as a helper, you can use helper_method

class ApplicationController < ActionController::Base
  helper_method :bitly_connect

  def bitly_connect
    @bitly ||= begin
      Bitly.use_api_version_3
      Bitly.new(APP_CONFIG['bitly_username'], APP_CONFIG['bitly_api_key'] )
    end
  end
end

Note that I also altered the method, so that it doesn't call Bitly.use_api_version_3 each time it is called.

As Ben Simpson noted, you should probably move this into a Model though.

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