We can drop use of the old key as we no longer need to read data from
the old key. Either data exists in the new key and we read it from there
or data doesn't exist in the new key and we go to the API to get it and
then set it in redis.
Note, the previous commit is important because it means we aren't at
risk of when this commit is being deployed out, of us getting stale data
from the old key.
We want to change cache keys for templates and broadcasts to include
their service ID. So cache keys should change from
`template-{template_id}-versions` to
`service-{service_id}-template-{template_id}-versions`.
The first step of this which needs to be deployed as a change first is
to delete both keys when updating service templates (even if they key is
not yet set). This means that when we release code in the next PR to
start setting the new key, we won't run into a case where either the old
or the new key can remain set with stale data.
This should make the pages slightly quicker to load, because Redis will
return the JSON string faster than the API.
The only change that can happen to a broadcast which doesn’t go through
the admin app is a broadcast ending at its scheduled time. So this could
result in a cached broadcast having a status of `broadcasting` when it
had in fact finished. We already account for this here though:
b2b58ec044/app/models/broadcast_message.py (L89-L94)
Shows current and previous broadcasts. Does not add a page for viewing
an individual broadcast.
Broadcasts are split into live and previous.
Draft broadcasts are excluded from the dashboard.
This commit removes the code the puts areas into the session and instead
creates and then updates a draft broadcast in the database.
This is so we can avoid session-related bugs, and potentially having a
large session when we start adding personalisation etc.
Once a broadcast is ready to go it is set to `broadcasting` straight
away with no approval. We’ll revisit this as we learn more about how
users might want to manage who can create and approve broadcasts.
The tests are a bit light in terms of checking what’s on the page, but
clicking through the pages is probably good enough for now.
