Rails%203%20In%20Action

Subscribing to updates
Great, so now your users will receive multipart emails; their email clients should
attempt to render the HTML part of these first and, if they can’t, then fall back to the
text part. Such is the beauty of email these days.
Now is the time to commit these changes, but not before running your tests by running
rake cucumber:ok spec:
60 scenarios (60 passed)
679 steps (679 passed)
# and
40 examples, 0 failures, 20 pending
Awesome! Everything is still going. Commit this change:
git add .
git commit -m "Send HTML ticket notification emails"
git push
Your ticket notification email will be sent out with two parts: an HTML version and a
text version. This provides a way for email applications of all ages to render your
email. Hopefully, more people will see the HTML version than the text version.
You learned how to generate a mailer and create a mailer method to it, and now
you’re going to move into how you can let people subscribe to receive these emails.
You’re currently only subscribing the ticket’s author to the list of watchers associated
with this ticket, but other people may also wish to be notified of ticket updates. You
can do this in two separate ways: through a watch button and through automatic subscription.
12.2 Subscribing to updates
You’ll provide other users with two ways to stay informed
of ticket updates. The first will be very similar to the
automatic subscription of a user when they create the
ticket, but this time you’ll automatically subscribe users
who comment on a ticket. You’ll reuse the same code that
Figure 12.3 The watch button
you used in the previous section to achieve this, but not in the way you might think.
The second will be a watch button on the ticket page, which will display either
Watch This Ticket or Stop Watching This Ticket, depending on if the user is watching
the ticket or not, as shown in figure 12.3.
We’ll first look at implementing the automatic subscription when a user posts a
comment to a ticket.
12.2.1 Testing comment subscription
You’ll now implement a feature to make users automatically watch a ticket when they
create a comment on it. This is useful because your users will want to keep up-to-date
with tickets that they have commented on. Later on, you’ll implement a way for these
users to opt out.
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