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Editorial Team
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Asked: 2026-05-20T10:15:48+00:00

I just encounter a problem similar to http://www.ruby-forum.com/topic/216433 I need to access controller instance

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I just encounter a problem similar to http://www.ruby-forum.com/topic/216433

I need to access controller instance variable from helper.

Here is the code I have done, and it’s not work.

Controller:

class ApplicationController < ActionController::Base
  helper_method :set_background_type #for action only background setting

  #for controller-wise background setting
  def set_background_type(string)
    @background_type = string
  end
end

Helper:

module ApplicationHelper

  def background_type
    @background_type || 'default'
  end

end

Layout:

<body class="<%= background_type %>">
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1 Answer

  1. Editorial Team

    After some searching. I got one solution from

    http://api.rubyonrails.org/classes/ActionController/Helpers/ClassMethods.html

    and the Controller becomes:

    class ApplicationController < ActionController::Base
  helper_method :set_background_type #for action only background setting
  helper_attr :background_type
  attr_accessor :background_type

  #for controller-wise background setting
  def set_background_type(string)
    @background_type = string
  end

  def background_type
    @background_type || 'default'
  end
end

    and remove the method from ApplicationHelper.
    It’s work for this scenario, but I’m still curious,

    is there a way to access controller instance variable for method in ApplicationHelper?

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