method

helper_method

Importance_2
v2.0.3 - Show latest stable - 1 note - Class: ActionController::Helpers::ClassMethods
helper_method(*methods) public

Declare a controller method as a helper. For example, the following makes the current_user controller method available to the view: 

  class ApplicationController < ActionController::Base
    helper_method :current_user
    def current_user
      @current_user ||= User.find(session[:user])
    end
  end
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September 18, 2014 - (<= v4.0.2)
0 thanks

Only in ApplicationController

Seems like we can use helper_method only in ApplicationController. Even if we will create child controller, methods that will be created in child and listed in child’s helper_method will not be accessible from the view.

For example, we have

class SystemController < ApplicationController
 def important_method
   "I am important!"
 end
end

and

class BookController < SystemController
 def index
 end
end

And calling important_method from Book’s index view will raise an NoMethodError.