AAP-88287 Prefetch content_object in ResourceViewSet to fix N+1 - #1109
AAP-88287 Prefetch content_object in ResourceViewSet to fix N+1#1109AlanCoding wants to merge 1 commit into
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📝 WalkthroughWalkthroughThe resource view queryset now prefetches each resource’s ChangesResource query loading
Estimated code review effort: 1 (Trivial) | ~2 minutes Merge Risk: 🟡 Moderate · up to This change may reduce N+1 queries for resource_data requests, but it also prefetches content objects for requests that do not use them, adding avoidable database work. Conditional prefetching and query-count validation are needed before merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@ansible_base/resource_registry/views.py`:
- Line 105: Update ResourceListSerializer’s queryset flow so content_object is
prefetched only when the request action enables resource_data and accesses it,
moving that prefetch into get_queryset() while retaining the existing
select_related behavior. Add query-count checks covering list requests with
default fields and with extra_fields=resource_data.
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ansible_base/resource_registry/views.py
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Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## devel #1109 +/- ##
=======================================
Coverage 94.76% 94.77%
=======================================
Files 259 259
Lines 14474 14491 +17
Branches 2218 2219 +1
=======================================
+ Hits 13717 13734 +17
Misses 757 757
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ResourceDataField.to_representation() accesses resource.content_object
(a GenericForeignKey) per row, causing one query per resource in the
page. Conditionally add prefetch_related("content_object") in
get_queryset when extra_fields=resource_data is requested, grouping
lookups by content_type and reducing N extra queries to one per
distinct type.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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DVCS PR Check Results: PR appears valid (JIRA key(s) found) |
…AAP-88287) Replaces the placeholder scaffold test with a real proof-of-concept: a single hard "N queries max" cutoff plus a non-empty-list sanity check, instead of the old 2-vs-20-object delta comparison used in PR ansible#1103. Validated locally: this test FAILS against current devel (29 queries for 27 resources -- the known AAP-88287 N+1 in ResourceDataField.to_representation()) and PASSES once PR ansible#1109's prefetch_related("content_object") fix is applied (verified by temporarily patching ansible_base/resource_registry/views.py locally and reverting -- that fix is not part of this commit). This test is EXPECTED TO FAIL until ansible#1109 merges to devel, same as PR ansible#1103's equivalent old-pattern test. Full shared/non-transactional seeding (AAP-88875) and the generalized, parameterized version of this coverage (AAP-88876) are tracked separately; this is a small, self-contained benchmark to validate the new pattern ahead of that infrastructure. Co-authored-by: Cursor <cursoragent@cursor.com>
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Hello @AlanCoding once this is merge, the following test will pass as well #1103 and #1110. |
…ale tests Per Alan Rominger's guidance: wrapping each test in pytest-django's default atomic()/savepoint isolation (@pytest.mark.django_db) can itself add SAVEPOINT/RELEASE SAVEPOINT queries when the code under test opens its own nested atomic() (e.g. ansible_base/rbac/caching.py's permission-recomputation batches used by bulk_give_permissions()), silently inflating the query counts these tests exist to measure. transaction=True avoids that but truncates all tables after every test, which would erase the AAP-88875 shared dataset after the first test in the session. Replaces the db/django_db-marker dependency chain in this directory with a session-scoped _unblocked_db fixture that calls setup_databases()/ teardown_databases() directly (bypassing pytest-django's marker-based alias detection, which would otherwise skip redirecting to the test database entirely since nothing here carries the django_db marker) and keeps DB access open for the whole session with no enclosing transaction. Adds local, session-scoped, idempotent counterparts to admin_user/local_authenticator/ admin_api_client so they don't pull the db fixture back in. Removes @pytest.mark.django_db from the benchmark test accordingly. Verified against both a cold (freshly created) and warm test database: seeding still completes well within budget, the test still fails on unfixed devel (53 queries for 683 resources) and passes with PR ansible#1109's fix applied locally. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
prefetch_related("content_object")toResourceViewSet.queryset?extra_fields=resource_datais requested — each resource'scontent_object(GenericForeignKey) was loaded individuallyTest plan
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