The FK-chain resolution added in the previous patch only handles ONE
level of nesting: it requires $parent_alias to be a direct relationship
of $main_source. This holds for every +count embed currently declared
in api/v1/swagger/ (all exactly one level deep, e.g.
biblio.items+count), but if that assumption is ever violated - a
deeper nested +count, a parent relation with a coderef (custom join)
condition, or no matching FK column name - the previous code silently
fell back to the pre-fix expression ($parent_alias.$fk_self), which can
reference a join alias that isn't available inside DBIC's limiting
subquery, reproducing the original 500 with no diagnostic.
This patch makes _build_count_subquery decline to build a subquery
(return undef) when the correlation can't be safely resolved, instead
of emitting SQL that may be broken. The caller already has an existing,
tested degradation path for "no DBIC relationship info" (prefetch the
association directly; to_api falls back to the Perl-level ->count call;
sorting on it is rejected with a clean 400) - unresolved nested
correlations now go through that same path rather than risking a 500.
Also:
- Extract the repeated "_resultset vs _result" result-source lookup
into a shared _result_source() helper (was duplicated in
dbic_merge_prefetch and _build_count_subquery).
- Document the one-level-deep limitation in _build_count_subquery's POD.
- Add a regression test pinning the 2-level-nested-+count case: it must
fall back to a plain prefetch (no COUNT subquery) rather than error
or emit unsafe SQL.
Test plan:
1. ktd --shell
2. prove t/Koha/REST/Plugin/Query.t t/db_dependent/Koha/Object.t \
t/db_dependent/Koha/REST/Plugin/Objects.t \
t/db_dependent/api/v1/acquisitions_orders.t \
t/db_dependent/api/v1/acquisitions_vendors.t \
t/db_dependent/api/v1/ill_requests.t \
t/db_dependent/api/v1/tickets.t \
t/db_dependent/api/v1/patrons.t
=> All pass, no regressions.
Signed-off-by: Martin Renvoize <martin.renvoize@openfifth.co.uk>
Signed-off-by: Pedro Amorim <pedro.amorim@openfifth.co.uk>
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