[Koha-bugs] [Bug 29522] Bib record not correctly updated when merging identical authorities with LinkerModule set to First Match

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=29522

--- Comment #8 from Nick Clemens <nick at bywatersolutions.com> ---
(In reply to Phil Ringnalda from comment #7)
> There is a fourth scenario: when someone is intentionally updating an
> authority in such a way that autolink will realize it should link to
> something else, in order to avoid an actual old->new merge.
> 
> authorities/merge.pl is optimized for merges where you are merging authid 10
> to authid 1, but you are keeping the 100 tag from 10, or you are keeping the
> 008+040$f from 10 to give 1 a different $2 in the linked bib records, so
> that there's a reason to update the headings in bibs linked to the kept
> authority record. Whether or not the merge will make any difference to
> linked bibs, it calls ModAuthority on 1, triggering a 1->1 merge by doing
> so, and then merges 10->1.
> 
> That makes merging Thrillers (Ficition) with 1 linked bib to Thrillers
> (Fiction) with 13534 linked bibs a bad idea (unless you have MergeLimit over
> 13534), since deferred merges aren't particularly robust. Even below
> MergeLimit, it's a waste of time and electrons to update every linked bib
> when you haven't made any changes that will update anything. So all day
> every day, I change "Patterson, James" to "Patterson, James, 1947-" in an
> authority record, expecting the attached bib to realize it should relink to
> the existing authority. My extensive use of something isn't necessarily a
> reason not to break it, but removing relinks for updating a single authority
> would be a huge workflow frustration for me.

It sounds like you are describing related bugs that you have created a
workaround to avoid:
1 - Deferred merges aren't reliable? Could you file a bug with more details on
what the problem is with deferred merges?
2 - Linked biblios should not be updated when the authorized heading, including
indicators and thesaurus values, have not changed 

I don't think it is a general expectation that merging or updating authorities
would end up linking the biblio headings to a different authority.

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