[Koha-bugs] [Bug 22437] Subsequent authority merges in cron may cause biblios to lose authority information

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=22437

--- Comment #18 from Phil Ringnalda <phil at chetcolibrary.org> ---
I'm not convinced that the sample data is actually linked in a way that lends
itself to linking tests. At least for me, yes, authid 35 is linked to 9 bibs,
but none of them actually should be linked to it, since it's a uniform title in
Portuguese and the linked bibs are all Perl books, claiming that the subject
heading for Perl is linked to that Saramago uniform title. There might be an
interesting bug in what happens when that authority is merged (and by being
merged, gets relinked), but not this one, exactly.

By cheating and being a cataloger by day (who has burned himself with this bug
without realizing what happened at the time), so I don't mind creating my own
records, I went with the alternate test plan of

1. Create the personal name authorities One, Three, and Four
2. Create one bib linked to One from its author, three linked to Three, four
linked to Four
3. Merge One to Three, then Three to Four
4. run the cronjob

Without the patch, I end up with only four bibs linked to Four; with the patch,
I end up with eight bibs linked to it, all saying in the bib that they are by
Four. So for the C->B->A case when all three are linked to things they should
be linked to, this patch does indeed work perfectly.

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