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Where to put Ruby helper methods for Rails controllers?

Posted by: admin November 30, 2017 Leave a comment

Questions:

I have some Ruby methods certain (or all) controllers need. I tried putting them in /app/helpers/application_helper.rb. I’ve used that for methods to be used in views. But controllers don’t see those methods. Is there another place I should put them or do I need to access those helper methods differently?

Using latest stable Rails.

Answers:

You should define the method inside ApplicationController.

Questions:
Answers:

For Rails 4 onwards, concerns are the way to go. There is a decent article here
http://richonrails.com/articles/rails-4-code-concerns-in-active-record-models

In essence, if you look in your controllers folder you should see a concerns sub-folder. Create a module in there along these lines

module EventsHelper
  def do_something
  end
end

Then, in the controller just include it

class BadgeController < ApplicationController
  include EventsHelper

  ...
end

Questions:
Answers:

you should define methods inside application controller, if you have few methods then you can do as follow

class ApplicationController < ActionController::Base    
  helper_method :first_method
  helper_method :second_method

  def first_method
    ... #your code
  end

  def second_method
    ... #your code
  end
end

You can also include helper files as follow

class YourController < ApplicationController
  include OneHelper
  include TwoHelper
end

Questions:
Answers:

You can call any helper methods from a controller using the view_context, e.g.

view_context.my_helper_method

Questions:
Answers:

Ryan Bigg response is good.

Other possible solution is add helpers to your controller:

class YourController < ApplicationController
  include OneHelper
  include TwoHelper
end

Best Regards!