Rails%203%20In%20Action

506 CHAPTER 17 Engines
This is the element in which you’ll be displaying the user on the page, with the content
being the name of the user that you set up in the sign_in! method. This user
association is actually going to be set both on the topic and its first post. Right now this
element doesn’t exist, and so if you were to run this test it would fail.
Your first step is to associate the topic to a user when you create the topic in
Forem::TopicsController. You can do this by changing this line of the create action
@topic = Forem::Topic.create(params[:topic])
to these two lines:
params[:topic].merge!(:user => current_user)
@topic = Forem::Topic.create(params[:topic])
This will set up the user association for the topic, passing it through with the other
parameters inside params[:topic]. This will not set up the first post for this topic to
have this user associated, which is what you need in order to make your test pass. To
do this, create a before_save callback in the Forem::Topic by using the code from
the following listing, placing it under the accepts_nested_attributes_for :post
line in the model.
Listing 17.16 app/models/forem/topic.rb
before_save :set_post_user
private
def set_post_user
self.posts.first.user = self.user
end
With the user association now set for a topic’s first post, you can display the user’s
name along with the post by putting this line under the small tag already in app/
views/forem/posts/_post.html.erb:
By
Here you use Forem::Engine.user_name, which is the method that you use to display
the user’s name. In this case, it would display the login attribute. When you run bin/
rspec spec/integration/topics_spec.rb, all your tests will pass:
3 examples, 0 failures
That was easy! When a topic is created, the topic and its first post will now belong to
the user who created it. Remember: your User model is in another castle, or rather, it
is in your application, and so this is very cool.
Now you’ll need to check that users are logged in before they create posts too, and
then associate the posts to the users upon creation.
17.7.5 Post authentication
You’ve got the authenticate_forem_user! method defined in the Forem
::ApplicationController, and so it’s available for all controllers that inherit from it.