Rails test and ActiveRecord in routes.rb

I would like to know how I could use ActiveRecord in the routes.rb file on my Rails application.

I am creating some optional modules which can be enabled or disabled dynamically. I don't want the routes to exists if the module is disabled so I created a condition around the optional routes. In development it's work properly but in the test environment, my query returns nil even if my fixtures are properly settled.

How can I make tests to use my fixtures when I am using OptionalModule.all ?

Thanks !

Here is my routes.rb file:

Rails.application.routes.draw do
  optional_modules = OptionalModule.all # this returns nil in test mode

  # by_name is a scope defined in the model
  if optional_modules.by_name('GuestBook').enabled?
    get 'toggle_guest_book_validated/:id', to: 'admin/guest_books#toggle_guest_book_validated', as: :toggle_guest_book_validated
  end
end

My fixtures:

guest_book:
  name: GuestBook
  enabled: true

My project:

• Rails 4.2
• Ruby 2.2.0