[FIX]: Fix get_test_results() lazy-load crashes and missing-result guard

[x15sr71]

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Description

get_test_results() — Production Bug Report & Fix

get_test_results() crashes with HTTP 500 on test detail pages. Production access.log contains 3,087 HTTP 500 responses on /test/ URLs. error.log contains 5697 stack-trace frames involving SQLAlchemy lazy-loading, plus 57 confirmed AttributeError crashes from a missing null check.

Evidence — commands run on production VM

All commands run on the production VM at /var/www/sample-platform/.

5697 SQLAlchemy lazy-load stack-trace frames

grep -n "_emit_lazyload\|_load_for_state" /var/www/sample-platform/logs/error.log | wc -l
# 5697

Bug 1 stack trace (category.regression_tests)

grep -A 10 "line 76, in <listcomp>" /var/www/sample-platform/logs/error.log | grep -A 5 "category.regression_tests" | head -40

57 NoneType crashes (Bug 3)

grep -n "line 94" /var/www/sample-platform/logs/error.log | grep "controllers.py" | wc -l
# 57

Bug 3 stack trace with test IDs

grep -A 10 "line 94, in get_test_results" /var/www/sample-platform/logs/error.log | head -40

3087 confirmed HTTP 500 responses on test detail pages

grep " 500 " /var/www/sample-platform/logs/access.log | grep "/test/" | wc -l
# 3087

Bug 4 — 19 regression tests with non-zero expected_rc

SELECT COUNT(*) FROM regression_test WHERE expected_rc != 0;
# 19

# All 19 have regression_test_output rows confirming comparison was intended
SELECT rt.id, rt.expected_rc, rto.correct, rto.correct_extension
FROM regression_test rt
JOIN regression_test_output rto ON rto.regression_id = rt.id
WHERE rt.expected_rc != 0
ORDER BY rt.id;
# 19 rows returned, all with defined correct hashes

---

Bug 1 — Lazy-load crash on category.regression_tests (line 76)

Stack trace appearing thousands of times in logs/error.log (verified with grep -A 10 "line 76, in <listcomp>"):

mod_test/controllers.py, line 68, in get_test_results
    results = [{
mod_test/controllers.py, line 76, in <listcomp>
    } for rt in category.regression_tests if rt.id in test.get_customized_regressiontests()]
sqlalchemy/orm/attributes.py, line 482, in __get__
sqlalchemy/orm/strategies.py, line 912, in _load_for_state
sqlalchemy/orm/strategies.py, line 1046, in _emit_lazyload

Cause: Category.regression_tests uses SQLAlchemy's default lazy='select' (no explicit lazy= in mod_regression/models.py line 38). The lazy SELECT fires inside the list comprehension when SQLAlchemy attempts a lazy load outside a usable session context.

Fix: selectinload(Category.regression_tests) on the Category query loads all regression tests in one batched query within the active session.

---

Bug 2 — Lazy-load on regression_test_output.multiple_files (lines 93–94)

result_file.regression_test_output and .multiple_files are both lazy-loaded relationships (mod_regression/models.py lines 148 and 153). They are accessed inside the same list comprehension that triggers Bug 1, making them structurally identical failure points in the same session context. A separately isolated stack trace for this specific relationship was not extracted from logs during this investigation.

Fix: joinedload(TestResultFile.regression_test_output).selectinload(RegressionTestOutput.multiple_files) applied to the TestResultFile query — joinedload for the scalar relationship (uselist=False), selectinload for the collection hanging off it.

---

Bug 3 — result is None crash (line 94)

57 confirmed occurrences in error.log at controllers.py line 94:

mod_test/controllers.py, line 94, in get_test_results
    if result_file.got is not None and result.exit_code == 0:
AttributeError: 'NoneType' object has no attribute 'exit_code'

Three example occurrences with test IDs:

• Test 4936 (2024-05-16)
• Test 5132 (2024-07-03)
• Test 5736 (2025-05-28)

Cause: TestResultFile rows are created by equality_type_request and TestResult rows by finish_type_request — separate HTTP calls from the VM. When a TestResultFile exists with got IS NOT NULL but no TestResult row was written, result is None and .exit_code raises AttributeError.

Fix: (result is None or result.exit_code == 0) — treats a missing result as worth checking for file mismatches rather than crashing. If the hash matches an accepted variant in multiple_files, it clears correctly even when result is None.

---

Bug 4 — File comparison skipped for non-zero expected_rc tests (line 91)

19 confirmed affected tests (SELECT COUNT(*) FROM regression_test WHERE expected_rc != 0 = 19, all expected_rc = 10).

Cause: result.exit_code == 0 skips the multiple-file variant check for any test where expected_rc != 0. All 19 affected tests have regression_test_output rows with defined correct hashes — proving comparison was always intended. The outer guard result_file.got is not None already ensures this block only runs when a mismatch was uploaded; the == 0 check was an undocumented additional gate with no semantic justification.

Fix: result.exit_code == result.expected_rc — runs the file check whenever the exit code matched expectation, zero or non-zero. Zero behavior change for all tests where expected_rc = 0.

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Test update — test_data_for_test

Category is mocked in the existing test. Our change inserted .options(...) before .filter(...) in the query chain, making mock_category.query.filter.assert_called_once() invalid — .filter() is now called on the return value of .options(), not directly on .query. The assertion is updated to mock_category.query.options.assert_called_once() to reflect the new call chain. selectinload is also patched to prevent SQLAlchemy from rejecting MagicMock attributes when validating loader options in newer versions. No business logic or expected behavior changed.

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Impact

Issue	Before	After
HTTP 500s on test detail pages	3,087 confirmed	Prevented for these code paths
Lazy-load failures (category.regression_tests)	Observed	Prevented by eager loading
NoneType crashes at line 94	57 confirmed	Prevented by null guard
Query pattern	N+1 per category	Batched (selectinload)

No behavior change for any test where data is complete.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud