Rails%203%20In%20Action

130 CHAPTER 6 Authentication and basic authorization
intelligently uses the name of the belongs_to association to imply that the fields are
project_id and user_id, respectively. When looking up a user, Active Record performs
a query like this:
SELECT * FROM users WHERE id = #{@ticket.user_id}
This query then returns a row from the database that matches the ID (if there is one),
and Active Record creates a new User object from this result.
With these associations set up, you now need to add a field on the tickets table to
store the ID of the user that a ticket links to. Run this command:
rails g migration add_user_id_to_tickets user_id:integer
Based solely on how you wrote the name of this feature, Rails will understand that you
want to add a particular column to the tickets table. You specify the name and type
of the column after the migration name, and Rails creates the migration with the field
prefilled for you.
If you open the new migration file (it’s the last one in the db/migrate directory),
you’ll see the output in the following listing.
Listing 6.9 db/migrate/[timestamp]_add_user_id_to_tickets.rb
class AddUserIdToTickets < ActiveRecord::Migration
def change
add_column :tickets, :user_id, :integer
end
end
It’s all done for you! You can close this file and then run the migration with rake
db:migrate and prepare the test database by using rake db:test:prepare.
Let’s rerun bin/cucumber features/creating_tickets.feature and see where it
stands now:
Then I should see "Created by user@ticketee.com"
expected there to be content "Created by user@ticketee.com" in "[text]"
Bash migrate alias
If you’re using bash as a shell (which is probably the case if you’re on a UNIX operating
system), you could add an alias to your ~/.bashrc to do both of these steps
for you rather than having to type them out:
alias migrate='rake db:migrate && rake db:test:prepare'
Then type source ~/.bashrc, and the alias will be available to you in your current
terminal window. It’ll also be available in new terminal windows even if you didn’t use
source, because this file is processed every time a new bash session is started. If
you don’t like typing source, then . ~/.bashrc will do.