Split Ruby on Rails routes into multiple smaller files

One time I faced fact that my application is big enough and routes.rb look like a mess. I’ve managed that this way.

I added routes directory to application config directory and added it in autoload_paths to ensure that routes are reloaded when these files change.

# config/application.rb
config.autoload_paths << Rails.root.join('config/routes')

Then moved necessary routes to small files like this.

# config/routes/api_routes.rb
module ApiRoutes
  def self.extended(router)
    router.instance_exec do
      namespace :api do
        resources :tasks, only: [:index, :show]
      end
    end
  end
end

Use instance_exec inside self.extended to draw routes in the context of router.

After I refactor routes.rb like this.

# config/routes.rb
Rails.application.routes.draw do
  root to: 'home#index'

  extend ApiRoutes
end

*Use extend to include these modules into the main routes.rb (they will be autoloaded, no need to require them).*