Rails%203%20In%20Action

258 CHAPTER 10 Tracking state
class Comment < ActiveRecord::Base
after_create :set_ticket_state
belongs_to :ticket
belongs_to :user
belongs_to :state
validates :text, :presence => true
end
While you’re here, you can also set it up so that you can access the project association
that the ticket association has in this model by using the delegates method:
delegate :project, :to => :ticket
If you call the project method on a Comment object, this method will “delegate” the
project method to the ticket object, making a call exactly like ticket .project. This
makes your code shorter and will come in handy later on.
The symbol passed to the after_create method here is the name of the method
to call for this callback. You can define this method at the bottom of your Comment
model using the code from the following listing.
class Comment < ActiveRecord::Base
...
private
end
Listing 10.12 app/models/comment.rb
Listing 10.13 app/models/comment.rb
def set_ticket_state
self.ticket.state = self.state
self.ticket.save!
end
With this callback and associated method now in place, the associated ticket’s state will
be set to the comment’s state after the comment is created. When you run your feature
again by running bin/cucumber features/creating_comments.feature, it still fails:
And I should see "Open" within "#ticket .state"
Failed assertion, no message given. (MiniTest::Assertion)
Even though you’re correctly assigning the state to the ticket, it still doesn’t display as
the state in the view. But why is this? You can attempt to duplicate this issue by running
the server using the rails server. By visiting http://localhost:3000, you can
follow the steps inside the scenario to attempt to duplicate the behavior you’ve seen
in your feature.
Because you have no states in the development database, you won’t be able to
reproduce this problem right away. Your feature uses the “Given there is a state
called...” steps to define states, but you can’t use these in your development environment.
It would be better if you added seed data to your database because then you’ll
have a repeatable way of setting up the states in your application’s database.