https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=41950

--- Comment #27 from Tomás Cohen Arazi (tcohen) <[email protected]> ---
Created attachment 199031
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=199031&action=edit
Bug 41950: (follow-up) Add DBIC relationship aliases for +count embeds

Adds DBIC relationship aliases so that +count embeds advertised in
the API specs are backed by actual database relationships, making
them sortable via the SQL COUNT subquery infrastructure.

New aliases:
- Borrower: checkouts (issues)
- Aqbookseller: baskets (aqbaskets), invoices (aqinvoices)
- Ticket: updates (ticket_updates)
- ErmEholdingsPackage: resources (erm_eholdings_resources)
- Biblio: holds (reserves)

Koha methods are updated to use the new relationship names directly,
following the one-liner style: Koha::Foo->_new_from_dbic( scalar ... )

Note: checkouts on Borrower and subscriptions on Aqbookseller already
had matching DBIC relationships. comments on Illrequest, requests on
IllBatch, and items on Biblio also already existed.

Test plan:
1. Apply patch
2. Run:
   $ ktd --shell
   k$ prove t/Koha/REST/Plugin/Query.t \
       t/db_dependent/api/v1/patrons.t \
       t/db_dependent/api/v1/acquisitions_vendors.t \
       t/db_dependent/Koha/REST/Plugin/Objects.t \
       t/db_dependent/Koha/Biblio.t
=> SUCCESS: All tests pass
3. Verify sorting works:
   GET /api/v1/patrons
   x-koha-embed: checkouts+count
   _order_by: -me.checkouts_count
=> SUCCESS: Patrons sorted by checkout count
4. Sign off :-D

Assisted-by: Sonnet 4.6 (Anthropic)

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