https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=31925

--- Comment #34 from Martin Renvoize (ashimema) 
<[email protected]> ---
Created attachment 204582
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=204582&action=edit
Bug 31925: Don't override 008/11 when the heading's thesaurus wasn't identified

QA (comments 23-30) flagged a regression in the previous patches: the
guard around coding a new authority's 008/11 (and 040$f) from the source
heading's thesaurus was `if ( $heading->{thesaurus} )`, but
C4::Heading::MARC21::_get_subject_thesaurus() never returns a false
value - a heading with a blank/unrecognised indicator 2 (by far the
commonest real-world case) comes back as the placeholder string
"notdefined", and indicator 2 = 4 comes back as "notspecified". Both are
truthy, so the override always fired, unconditionally coding every new
authority's 008/11 as 'z' or '|' instead of respecting the site's
MARCAuthorityControlField008 default (which defaults to 'a'/LCSH) - a
disruptive behaviour change for the majority of headings, not just the
non-LCSH ones this bug is meant to fix.

Adds Koha::Authority::$MARC21_UNDEFINED_THESAURUS_VALUES, the subset of
the existing thesaurus table's keys ('notdefined', 'notspecified') that
mean "no thesaurus could be identified" rather than a genuine one, and
uses it in LinkBibHeadingsToAuthorities()'s guard so those two values now
fall through to the site's own syspref default, unchanged, exactly as
before this bug's patches.

Test plan:
1. prove t/db_dependent/Biblio.t
   Note the two new cases in the "codes new authorities with the source
   thesaurus" subtest: a blank-indicator-2 heading now keeps 008/11 at
   the syspref default ('a') instead of being forced to 'z', and an
   indicator-2=4 heading respects a customised syspref default instead
   of being forced to '|'.
2. Librarian-facing regression check: with AutoLinkBiblios and
   AutoCreateAuthorities on, catalogue a 650 with a blank/space
   indicator 2 (e.g. `650 __ $a Some topic`, no $2) and save. The new
   authority's 008 position 11 should read whatever
   MARCAuthorityControlField008 says (LCSH 'a' by default), not 'z'.
3. Confirm the non-LCSH cases from the earlier patches are unaffected:
   a FAST heading (ind2=7, $2=fast) still codes 008/11='z' with
   040$f=fast, and a MeSH heading (ind2=2) still codes 008/11='c'.

Sponsored-by: Heythrop Library <https://heythroplibrary.co.uk/>

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