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326 CHAPTER 12 Sending email
A
B
creating new ticket
Ticketee
Figure 12.4
Alice creates a ticket.
A Ticket
0 comments
Watchers
Alice
To automatically subscribe a user to a ticket of a new comment, use an after_create,
just as you did in the Ticket model for only the author of that ticket. But first, you
need to ensure that this works!
You’ll add another scenario to the “Ticket notifications” feature, but first let’s consider
the current flow. A couple of diagrams help explain this process.
First, let’s look at figure 12.4. Here, alice@ticketee.com creates a ticket that will
automatically subscribe her to be notified of any comments posted to it.
Next, figure 12.5. Then bob@ticketee.com
comes along and leaves a comment on the
ticket, which should subscribe bob@ticke-
tee.com to these ticket updates. This is the feature
that you’ll code in a short while. After Bob
has commented on the ticket, Alice receives a
notification telling her just that. Now that Bob
is subscribed to the ticket, he should receive
comment notifications every time somebody
else—such as Alice—comments on the ticket,
as shown in figure 12.6.
In this case, alice@ticketee.com shouldn’t
receive a notification about a comment if she’s
the one posting it! With the scenario
explained, you can write it in Cucumber-form
at the bottom of the “Ticket notifications” feature,
as shown in the following listing:
A
B
notified of B’s comment
comments on ...
Ticketee
Figure 12.5 Bob
comments on the ticket.
A
B
comments on ...
notified of
A’s comment
Figure 12.6
Alice comments on
the ticket, too.
B is added to ...
Ticketee
A Ticket
1 comment
Watchers
Alice
Bob
... the ticket
A Ticket
2 comments
Watchers
Alice
Bob