Rails%203%20In%20Action

88 CHAPTER 4 Oh CRUD!
4.2 Editing projects
With the first two parts of CRUD (creating and reading) done, you’re ready for the
third part: updating. Updating is similar to creating and reading in that it has two
actions for each part (creation has new and create, reading has index and show). The
two actions for updating are edit and update. Let’s begin by writing a feature and creating
the edit action.
4.2.1 The edit action
As with the form used for creating new projects, you want a form that allows users to
edit the information of a project that already exists. You first put an Edit Project link
on the show page that takes users to the edit action where they can edit the project.
Write the feature from the following listing into features/editing_projects.feature.
Listing 4.5 features/editing_projects.feature
Feature: Editing Projects
In order to update project information
As a user
I want to be able to do that through an interface
Scenario: Updating a project
Given there is a project called "TextMate 2"
And I am on the homepage
When I follow "TextMate 2"
And I follow "Edit Project"
And I fill in "Name" with "TextMate 2 beta"
And I press "Update Project"
Then I should see "Project has been updated."
Then I should be on the project page for "TextMate 2 beta"
In this story, you again use the bin/cucumber command to run just this one feature:
bin/cucumber features/editing_projects.feature.
The first three steps pass for this feature because of the work you’ve already done,
but it fails on the fourth step when it tries to follow the as-yet nonexistent Edit Project
link on the show page:
no link with title, id or text 'Edit Project' found (Capybara::ElementNotFound)
To add this link, open app/views/projects/show.html.erb and add the link from the
following listing underneath the code currently in that file.
Listing 4.6 app/views/projects/show.html.erb
The edit_project_path method generates the link to the Project object, pointing at
the ProjectsController’s edit action. This method is provided to you because of the
resources :projects line in config/routes.rb.