How to use same variable across various controllers - ruby on rails

Question

I am using ruby 2.3.1 and rails 3.2.1. I need to initialize a variable called has_sub_menu = false in application controller.

In my application i am using more than 30 controllers and only two controllers contains sub-menu, so i need to assign has_sub_menu = true to these controllers to validate it in layout file.

This is my application.rb

has_sub_menu = false

some_controller01.rb

has_sub_menu = true

some_controller02.rb

has_sub_menu = true

I tried like this in layout.rb,

if controller.has_sub_menu == true
  show_menu_items
end

show_menu_items will be available in that two controller and currently i am not able to access the has_sub_menu value in layout file

I know in c# I can declare the variable as static and access it in any file using object.

Like wise how can i declare a variable in application controller and assign different value to that variable in other two controller and I need to access that value in layout.rb file for sub-menu validation.

shouldnt that go in the application_controller as a method instead of application.rb? — Alok Swain
– Alok Swain, Commented Nov 4, 2016 at 14:32

Andrey Deineko · Accepted Answer · 2016-11-04 14:32:19Z

1

Add an instance method in application_controller.rb and override it in any controller, that should have different value:

class ApplicationController < ActionController::Base
  def has_sub_menu # unless overriden in descending controller, value will be true
    true
  end
end

class OtherController < ApplicationController
  def has_sub_menu
     false
  end
end

This way you have access to has_sub_menu "method" in all controllers.

answered Nov 4, 2016 at 14:32

Andrey Deineko

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Comments

Deepak Mahakale · Accepted Answer · 2016-11-04 14:41:57Z

1

Instead, you can create a helper method and check for controller name

module ApplicationHelper
  CONTROLLERS_LIST = ['UsersController']

  def has_sub_menu
    CONTROLLERS_LIST.exclude?(params[:controller])
  end
end

edited Nov 4, 2016 at 14:41

answered Nov 4, 2016 at 14:36

Deepak Mahakale

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4 Comments

Andrey Deineko Over a year ago

not that straightforward and clear for those, who see controller's code for the first time, but indeed a good option!

Deepak Mahakale Over a year ago

He says he need to check it in layout so it's better to add this logic in helper method

siva Over a year ago

I am looking for a solution to validate it instead of controller_name.

Deepak Mahakale Over a year ago

In that case go for the solution @andrey has posted

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