https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=37564

--- Comment #20 from Martin Renvoize (ashimema) 
<[email protected]> ---
Created attachment 200731
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=200731&action=edit
Bug 37564: Rebuild holds queue and reindex once per batch, not per item

AddItemBatchFromMarc previously let Koha::Item->store rebuild the holds
queue and reindex the biblio as each item was stored, so importing a
record with N items triggered N holds queue jobs and N reindexes for a
single biblio.

Defer both operations: each item is now stored with skip_record_index
and skip_holds_queue set, and the biblio is reindexed and the holds
queue rebuilt a single time once the whole batch has been added. The
caller can still suppress either step via the $options hashref, and
bulkmarcimport now passes skip_record_index through in line with the
biblio level options (so --skip_indexing and the Elasticsearch batch
indexer also cover the item additions).

This resolves the two TODOs noted on the previous patch. As a result,
updating an existing record now generates a single holds queue job per
record rather than one per item.

Test plan:
1. Enable RealTimeHoldsQueue and clear background_jobs.
2. Import a record with several items, matching and *updating* an
   existing record (see the holds queue patch test plan, step 13).
3. Confirm only a single update_holds_queue_for_biblios job is created
   for the record, regardless of the number of items.
4. Confirm the imported items are searchable (the reindex still happens,
   once).
5. Repeat with --skip_indexing and confirm no reindex is triggered.
6. Repeat on an Elasticsearch system and confirm items are indexed via
   the batch indexer.
7. prove t/db_dependent/Labels/t_Batch.t

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