Rails%203%20In%20Action

56 CHAPTER 3 Developing a real Rails application
To run all features for your application, run rake cucumber:ok. This command causes
the following error message:
...db/schema.rb doesn't exist yet. Run "rake db:migrate" to
create it then try again. If you do not intend to use a database,
you should instead alter ...ticketee/config/application.rb to limit
the frameworks that will be loaded
The db/schema.rb file referenced here (when generated) will contain a Ruby version
of your database’s schema, which can be used to import the structure of your database.
The great thing is that this file is database agnostic, so if you choose to switch
databases during the life of your project, you won’t have to re-create this schema file.
To generate this file, run this command:
rake db:migrate
For now, this command prints out the standard first line of rake output, the path to
the application:
(in /home/us/ticketee)
When you run any Rake task, the first line will be this line. Its only purpose is to indicate
which directory you’re running inside. When you run this particular task, it generates
the db/schema.rb file your feature required. Therefore, you can run rake
cucumber:ok again to have it fail on the second step of your feature:
When I follow "New Project"
no link with title, id or text 'New Project' found
The first step here passes, but you haven’t written a step definition for it, as you did in
chapter 2! It nevertheless passes because of the features/step_definitions/web_steps.rb
file, which was generated when you ran the rails generate cucumber:install command.
This file contains a step definition that matches your first step:
Given /^(?:|I )am on (.+)$/ do |page_name|
visit path_to(page_name)
end
First, Cucumber interprets this step on the basis of the definition from within this file.
The visit method inside this definition comes from Capybara and emulates going to
a specific path in a virtual browser. The path_to method is also defined, but it’s in the
features/support/paths.rb file inside the NavigationHelpers module, again provided
by Cucumber:
module NavigationHelpers
...
def path_to(page_name)
case page_name
when /the home\s?page/
'/'
...
Therefore, the path that Capybara will visit is /. If you start the server for the application
by running rails server (or rails s) and navigate to http://localhost:3000 in