Rails%203%20In%20Action

92 CHAPTER 4 Oh CRUD!
4.3.1 Writing a feature
You’re going to need a feature to get going: a Delete Project link on the show page
that, when clicked, prompts the user for confirmation. You put the feature at features/
deleting_projects.feature using the following listing.
Listing 4.13 features/deleting_projects.feature
Feature: Deleting projects
In order to remove needless projects
As a project manager
I want to make them disappear
Scenario: Deleting a project
Given there is a project called "TextMate 2"
And I am on the homepage
When I follow "TextMate 2"
And I follow "Delete Project"
Then I should see "Project has been deleted."
Then I should not see "TextMate 2"
When you run this feature using bin/cucumber features/deleting_projects
.feature, the first three steps pass, and the fourth fails:
And I follow "Delete Project"
no link with title, id or text 'Delete Project' found ...
4.3.2 Adding a destroy action
Of course, you need to create a Delete Project link for the show action’s template,
app/views/projects/show.html.erb. You put this on the line after the Edit Project link
using the following listing.
Listing 4.14 app/views/projects/show.html.erb
:delete,
:confirm => "Are you sure you want to delete this project?" %>
Here you pass two new options to the link_to method, :method and :confirm.
The :method option tells Rails what HTTP method this link should be using, and
here’s where you specify the :delete method. In the previous chapter, the four HTTP
methods were mentioned; the final one is DELETE. When you developed your first
application, chapter 1 explained why you use the DELETE method, but let’s review why.
If all actions are available by GET requests, then anybody can send you a link to, say,
the destroy action for one of your controllers, and if you click that, it’s bye-bye precious
data.
By using DELETE, you protect an important route for your controller by ensuring
that you have to follow the link from the site to make the proper request to delete this
resource.
The :confirm option brings up a prompt, using JavaScript, that asks users if
they’re sure of what they clicked. Because Capybara doesn’t support JavaScript by