How to call ApplicationController methods from ApplicationHelper

Question

I want to provide csv links in a view and I placed the csv generating code in ApplicationHelper. However I\'m getting this error:

undefined method `         


        

Answer 1

Use helper_method.

By default, methods in ApplicationController are only accessible inside the Controllers.

Add a method to the ApplicationController and expose it as a helper method with helper_method:

class ApplicationController < ActionController::Base

  helper_method :foo

  def foo
    "bar"
  end

end

Now the foo method is accessible to both Controllers and Views.