Rails%203%20In%20Action

290 CHAPTER 11 Tagging
To define the tags_tickets table, put this code in the change section of your db/
migrate/[timestamp]_create_tags.rb migration:
create_table :tags_tickets, :id => false do |t|
t.integer :tag_id, :ticket_id
end
The :id => false option passed to create_table here tells Active Record to create
the table without the id field, because the join table only cares about the link between
tickets and tags, and therefore does not need a unique identifier.
Next, run the migration on your development database by running rake
db:migrate, and on your test database by running rake db:test:prepare. This will
create the tags and tags_tickets tables.
When you run this scenario again with bin/cucumber features/creating
_tickets:48, it is now satisfied that the tags method is defined and moves on to complaining
that it can’t find the tag you specified:
And I should see "browser" within "#ticket #tags"
Failed assertion, no message given. (MiniTest::Assertion)
This failure is because you’re not doing anything to associate the text from the Tags
field to the ticket you’ve created. You need to parse the content from this field into
new Tag objects and then associate them with the ticket you are creating, which you’ll
do right now.
11.1.6 Displaying a ticket’s tags
The params[:tags] in TicketsController’s create is the value from your Tags field
on app/views/tickets/_form.html.erb. This is also the field you need to parse into Tag
objects and associate those tags with the Ticket object you are creating.
To do this, alter the create action in TicketsController by adding this line
directly after@ticket.save:
@ticket.tag!(params[:tags])
This new tag! method will parse the tags from params[:tags], convert them into new
Tag objects, and associate them with the ticket. You can define this new method at the
bottom of your Ticket model like this:
def tag!(tags)
tags = tags.split(" ").map do |tag|
Tag.find_or_create_by_name(tag)
end
self.tags