Rails%203%20In%20Action

Writing your first engine feature
Listing 17.2 spec/support/load_routes.rb
RSpec.configure do |c|
c.include Forem::Engine.routes.url_helpers,
:example_group => {
:file_path => /\bspec\/integration\//
}
end
This will load the URL helpers, such as topics_path, that you need for your test.
One interesting thing to note here is that your topics_path method doesn’t generate
the normal /topics URL as would be expected. Instead, it generates the correct
/forem/topics path. This is because your engine is mounted in spec/dummy/config/
routes.rb under the forem path. When you visit topics_path, you’re actually going
to visit the correct path of this route, like you would in a real application.
The next time you run your spec, you’ll see this error:
ActionController::RoutingError:
uninitialized constant Forem::TopicsController
Now your topics_path helper is working and generating a route to the index action
inside Forem::TopicsController, which you attempt to visit by using the visit
method. This controller doesn’t exist right now, and therefore you get this error. So
let’s generate this controller to proceed.
17.5.3 The topics controller
You’ve come to the stage where you need the first controller for your application,
Forem::TopicsController. To generate this controller, you can run this command:
rails g controller forem/topics
You have to namespace your controller by putting forem before it so that Rails creates
it correctly. This command will generate the normal controller stuff for your engine,
such as the controller itself, a helper, and the app/views/forem/topics directory.
What’s your spec tell you next? Let’s find out with bin/rspec spec/integration/
topics_spec.rb:
AbstractController::ActionNotFound:
The action 'index' could not be found for Forem::TopicsController
You now need to create the index action in Forem::TopicsController.
17.5.4 The index action
Let’s open app/controllers/forem/topics_controller.rb now. Inside this controller,
you’ll see this:
module Forem
class TopicsController < ApplicationController
end
end
485