Rails%203%20In%20Action

490 CHAPTER 17 Engines
NOTE We’re purposely not including validations in this action. This is
mainly to keep the chapter short, but it’s also a good exercise to be left to
you. Remember to write tests that the validations work before implementing
the code!
When you run your spec again using bin/rspec spec/integration/topics_spec.rb,
you’ll get this error:
AbstractController::ActionNotFound:
The action 'show' could not be found for Forem::TopicsController
You’re getting closer to having your spec pass! When it clicks the Create Topic button,
it’s now going through the create action successfully and is then redirecting to the
show action, which you need to define now.
17.5.7 The show action
The show action in Forem::TopicsController will be responsible for displaying a
topic and its posts. Your first step will be defining this action, which you can do by putting
this code inside app/controllers/forem/topics_controller.rb underneath the
create action:
def show
@topic = Forem::Topic.find(params[:id])
end
You’re then going to need to create the view for this action, which goes at app/views/
forem/topics/show.html.erb and contains the short bit of code in the following listing.
Listing 17.8 app/views/forem/topics/show.html.erb
"forem/posts/post", :collection => @topic.posts %>
You’re using a long form of render here again to render the app/views/forem/posts/
_post.html.erb partial for each of the posts. The shorter version goes like this:
Unfortunately, due to the namespacing on your model, Rails will attempt to render
the app/views/forem/forem/posts/_post.html.erb (double “forem”) partial instead.
You therefore have to be explicit. A short note: the long form’s syntax was how it used
to be done in earlier versions of Rails.
The partial that it renders hasn’t been created yet, and so this will be your next
step. Let’s create a new file at app/views/forem/posts/_post.html.erb and fill it with
this content:
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