[Koha-bugs] [Bug 31925] New: AutoCreateAuthorities needs to preserve subject heading thesaurus to not create duplicate authority records

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

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

            Bug ID: 31925
           Summary: AutoCreateAuthorities needs to preserve subject
                    heading thesaurus to not create duplicate authority
                    records
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P5 - low
         Component: MARC Authority data support
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: phil at chetcolibrary.org
        QA Contact: testopia at bugs.koha-community.org
                CC: nick at bywatersolutions.com
        Depends on: 30280

Bug 30280 taught the linker that "650 _ 0 $aFeminism" and "650 _ 7
$aFeminism$2sao" are not the same heading, so a bib record containing the
latter should not be linked to the authority record which matches the former.

However, AutoCreateAuthorities just creates LCSH authority records from
anything, no matter what the values of indicator 2 and subfield 2 are.

As a result, if you have an LCSH authority record for a term, and you
import/create a non-LCSH term in a bib record and save it,
AutoCreateAuthorities will create a new duplicate LCSH authority record and
link to that. Every single time, a new duplicate.

Steps to reproduce:

1. Use ElasticSearch, since the patch for bug 30280 only expected to work
there, and in fact broke linking on Zebra, bug 31924.
2. Enable the preferences AutoCreateAuthorities, AutoLinkBiblios,
CatalogModuleRelink
3. Edit any bib record, add a 650 tag, set the second indicator to 7, type
Feminism in subfield a and type sao in subfield 2.
4. Save the record, edit it again, note the authority record id in subfield 9
of the Feminism heading.
5. Edit any other bib record, add a 650 tag, set the second indicator to 7,
type Feminism in subfield a and type sao in subfield 2.
6. Save the record, edit it again, note the authority record id in subfield 9
of the Feminism heading.

The two authority record ids should be the same, since the headings are
identical, but instead one will be linked to, say, 1708 and the next to 1709,
an identical duplicate record. Rather than setting position 11 of field 008 in
the authority record to "a" for LCSH, AutoCreateAuthorities should have set it
to "z" for Other and put sao in subfield f of field 040 (and for non-7, non-0
values of indicator 2, it should be setting 008/11 to the correct letter for
that indicator value).


Referenced Bugs:

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=30280
[Bug 30280] Support authority records with common subject headings from
different thesaurus
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