[Koha-bugs] [Bug 13171] Check box for email is missing for hold notifications in patron messaging preferences.

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13171

--- Comment #14 from Barton Chittenden <barton at bywatersolutions.com> ---
Katrin,

I believe that what's happening here is that when rows are deleted from the
letter table, there's a cascading delete on message_transports. There's a
foreign key relationship between letter and message_transports, but the keys
aren't entirely constrained... so deleting *any* row in the letter table will
delete the rows in the message_transports with that letter code.

At the time that this was discussed, this wasn't seen as a big deal, because
the only way this could happen through the GUI was to delete the entire
message, in which case the row would need to be removed from message_transports
anyway.

Unfortunately this didn't take upgradedatabase into account, and I think that
we've seen this happen a couple of times because of that.

--Barton

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