Class variables with params values in ApplicationController

In appllication controller i have couple of methods that works with requested controller and action name.

To follow DRY principe, i want to define share variables with those params.

class ApplicationController < ActionController::Base
   @@requested_action     = params[:action]
   @@requested_controller = params[:controller]
end

But i get error: undefined local variable or method "para开发者_JAVA技巧ms" for ApplicationController:Class

Why i can't do this and how can i achieve my goal?

---

I believe you already have controller_name and action_name variables defined by Rails for this purpose.

If you want to do it by your way, you must define it as a before filter as params comes to existence only after the request is made. You can do something like this

class ApplicationController < ActionController::Base
  before_filter :set_action_and_controller

  def set_action_and_controller
    @controller_name = params[:controller]
    @action_name = params[:action]
  end
end

You can access them as @controller_name and @action_name. But controller_name and action_name are already defined in Rails. You can use them directly.

---

Use instance methods instead:

class ApplicationController < ActionController::Base
  def requested_action
    params[:action] if params
  end
end

---

You can use before_filter option.

class ApplicationController < ActionController::Base
  before_filter :set_share_variable

  protected

  def set_share_variable
    @requested_action     = params[:action]
    @requested_controller = params[:controller]
  end
end