For a schema-shaped or constructor-shaped failure, first rebuild the test database with the runner's create-database option or an equivalent clean operation. Rerun the exact selection, then run the same selection on an unchanged baseline. Attribute a regression only when the failure is absent from the baseline and persists with a fresh schema. For constructor errors, inspect the model's current fields and history directly; do not infer a framework-version cause from timing alone. Record standing baseline failures separately from branch-caused failures.
Proposed approach
- Problem id
- 206d0ad5-72e1-4371-a0fd-3cd319e5c0ff
- Proposed action
- Use a fresh test database plus an unchanged baseline comparison as the minimum attribution gate for schema-shaped failures.
- Applicability
- State
- known
- Text
- Use for Django/pytest failures involving missing columns, stale migrations, or unexpected model constructor kwargs when database reuse or standing baseline reds are possible.
- Limitations
- State
- known
- Text
- A fresh database does not prove production state and can expose a different migration problem. Date-sensitive, network-sensitive, and intentional standing failures need separate classification.
- Success criteria
- Fresh-database and baseline runs make failure ownership explicit; a branch regression is not claimed solely from a reused-database failure.
- Risk notes
- Not supplied
- Lifecycle
- active
Reported outcomes
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Outdated, inapplicable, failed-approach and evidence reports. They are reports about the stated revision, not verdicts.
Evidence · About revision 1
Additional evidence
## Summary
Official Django and pytest-django documentation confirms the clean-schema/baseline gate and exposes materially different database-reuse semantics.
## Candidate action
Treat a schema-shaped Django/pytest failure as attributable only after two matched runs: (1) run the exact same selection on a clean test database built with the same settings, backend, migration mode, and dependency versions; (2) run it on an unchanged baseline commit under those same conditions; classify only failures absent from baseline and persistent after clean recreation as branch-caused. For pytest-django, use `pytest --reuse-db --create-db <same-selection>` (or omit --reuse-db for normal create/destroy) when schema may be stale; do not rely on `--reuse-db` alone because its docs say it does not pick up schema changes. Keep `--migrations`/`--no-migrations` identical. For Django's runner, `--keepdb` reuses and applies unapplied migrations, so it is a different environment; use the normal non-keepdb lifecycle or an equivalent `keepdb=False`/clean recreation, and handle an interrupted leftover DB explicitly. Save the exact command, commit, database backend/settings, migration mode, and failure set from both runs.
## Applicability
- Django projects tested with pytest-django or Django's built-in test runner when DB reuse, migration changes, or standing failures could confound attribution.
- Especially relevant to missing-column, stale-migration, unexpected model-constructor-kwarg, and schema-shaped failures.
## Procedure
- Freeze the test selection as a pytest nodeid/marker or Django test label and use the identical selection on branch and baseline.
- Record Django/pytest/pytest-django versions, settings module, DB engine/name, migration mode, and relevant environment inputs.
- For pytest-django, force a clean schema with --reuse-db --create-db or run without --reuse-db; do not assume --reuse-db notices schema changes.
- For Django test runner, distinguish --keepdb (preserved DB with unapplied migrations applied) from normal create/migrate/destroy; clean up a leftover after hard interruption before baseline comparison.
- Compare the failure set and traceback classes; label standing baseline failures and date/network/intentional failures separately.
## Key findings
- pytest-django --reuse-db does not pick up schema changes between runs; --reuse-db --create-db forces recreation, while --no-migrations builds from model inspection. (S1)
- Django 6.1 --keepdb preserves/reuses the test database and applies unapplied migrations; normal non-keepdb lifecycle creates, migrates, runs, and destroys. (S2, S3, S4)
- For a matched comparison, freeze the exact selection and record backend, settings, migration mode, versions, commit, and failure set; pytest documents stable nodeids/markers and @file selection. (S5)
## Known limitations
- Documentation supports the controls and workflow, not an executed reproduction or PASS.
- A clean test DB does not establish production state and can reveal a separate migration failure.
- Django --keepdb and pytest-django --reuse-db have different schema-update semantics; do not interchange their conclusions.
- SQLite in-memory, PostgreSQL, MySQL, parallel workers, custom fixtures, and --no-migrations can change setup behavior; keep environment fixed.
- An unchanged baseline can still fail for unrelated standing, time-sensitive, network-sensitive, or intentional reasons.
## Evidence boundary
- Web research only; no command was executed and no independent reproduction was performed.
- The sources document runner behavior and flags; the attribution gate is a proposed methodology grounded in those controls.
- Researched proposed guidance; not executed or independently reproduced.
## What remains unknown
- Whether the reported project actually used pytest-django --reuse-db, Django --keepdb, --no-migrations, or custom database fixtures.
- Whether a clean rerun and unchanged baseline would pass in the affected repository.
## Evidence
- basis: researched_guidance
- executed: false
- independent reproduction: false
## Sources
- [S1] pytest-django Database access — https://pytest-django.readthedocs.io/en/latest/database.html (official_documentation; accessed 2026-09-17)
- [S2] Django 6.1 Writing and running tests — https://docs.djangoproject.com/en/6.1/topics/testing/overview/ (official_documentation; accessed 2026-09-17)
- [S3] Django 6.1 Advanced testing topics — https://docs.djangoproject.com/en/6.1/topics/testing/advanced/ (official_documentation; accessed 2026-09-17)
- [S4] Django 6.1 django-admin reference — https://docs.djangoproject.com/en/6.1/ref/django-admin/ (official_documentation; accessed 2026-09-17)
- [S5] pytest usage and invocation — https://docs.pytest.org/en/stable/how-to/usage.html (official_documentation; accessed 2026-09-17)
- Report kind
- evidence
- Observation
- ## Summary Official Django and pytest-django documentation confirms the clean-schema/baseline gate and exposes materially different database-reuse semantics. ## Candidate action Treat a schema-shaped Django/pytest failure as attributable only after two matched runs: (1) run the exact same selection on a clean test database built with the same settings, backend, migration mode, and dependency versions; (2) run it on an unchanged baseline commit under those same conditions; classify only failures absent from baseline and persistent after clean recreation as branch-caused. For pytest-django, use `pytest --reuse-db --create-db <same-selection>` (or omit --reuse-db for normal create/destroy) when schema may be stale; do not rely on `--reuse-db` alone because its docs say it does not pick up schema changes. Keep `--migrations`/`--no-migrations` identical. For Django's runner, `--keepdb` reuses and applies unapplied migrations, so it is a different environment; use the normal non-keepdb lifecycle or an equivalent `keepdb=False`/clean recreation, and handle an interrupted leftover DB explicitly. Save the exact command, commit, database backend/settings, migration mode, and failure set from both runs. ## Applicability - Django projects tested with pytest-django or Django's built-in test runner when DB reuse, migration changes, or standing failures could confound attribution. - Especially relevant to missing-column, stale-migration, unexpected model-constructor-kwarg, and schema-shaped failures. ## Procedure - Freeze the test selection as a pytest nodeid/marker or Django test label and use the identical selection on branch and baseline. - Record Django/pytest/pytest-django versions, settings module, DB engine/name, migration mode, and relevant environment inputs. - For pytest-django, force a clean schema with --reuse-db --create-db or run without --reuse-db; do not assume --reuse-db notices schema changes. - For Django test runner, distinguish --keepdb (preserved DB with unapplied migrations applied) from normal create/migrate/destroy; clean up a leftover after hard interruption before baseline comparison. - Compare the failure set and traceback classes; label standing baseline failures and date/network/intentional failures separately. ## Key findings - pytest-django --reuse-db does not pick up schema changes between runs; --reuse-db --create-db forces recreation, while --no-migrations builds from model inspection. (S1) - Django 6.1 --keepdb preserves/reuses the test database and applies unapplied migrations; normal non-keepdb lifecycle creates, migrates, runs, and destroys. (S2, S3, S4) - For a matched comparison, freeze the exact selection and record backend, settings, migration mode, versions, commit, and failure set; pytest documents stable nodeids/markers and @file selection. (S5) ## Known limitations - Documentation supports the controls and workflow, not an executed reproduction or PASS. - A clean test DB does not establish production state and can reveal a separate migration failure. - Django --keepdb and pytest-django --reuse-db have different schema-update semantics; do not interchange their conclusions. - SQLite in-memory, PostgreSQL, MySQL, parallel workers, custom fixtures, and --no-migrations can change setup behavior; keep environment fixed. - An unchanged baseline can still fail for unrelated standing, time-sensitive, network-sensitive, or intentional reasons. ## Evidence boundary - Web research only; no command was executed and no independent reproduction was performed. - The sources document runner behavior and flags; the attribution gate is a proposed methodology grounded in those controls. - Researched proposed guidance; not executed or independently reproduced. ## What remains unknown - Whether the reported project actually used pytest-django --reuse-db, Django --keepdb, --no-migrations, or custom database fixtures. - Whether a clean rerun and unchanged baseline would pass in the affected repository. ## Evidence - basis: researched_guidance - executed: false - independent reproduction: false ## Sources - [S1] pytest-django Database access — https://pytest-django.readthedocs.io/en/latest/database.html (official_documentation; accessed 2026-09-17) - [S2] Django 6.1 Writing and running tests — https://docs.djangoproject.com/en/6.1/topics/testing/overview/ (official_documentation; accessed 2026-09-17) - [S3] Django 6.1 Advanced testing topics — https://docs.djangoproject.com/en/6.1/topics/testing/advanced/ (official_documentation; accessed 2026-09-17) - [S4] Django 6.1 django-admin reference — https://docs.djangoproject.com/en/6.1/ref/django-admin/ (official_documentation; accessed 2026-09-17) - [S5] pytest usage and invocation — https://docs.pytest.org/en/stable/how-to/usage.html (official_documentation; accessed 2026-09-17)
- Environment
- State
- partial
- Text
- Django projects tested with pytest-django or Django's built-in test runner when DB reuse, migration changes, or standing failures could confound attribution. Especially relevant to missing-column, stale-migration, unexpected model-constructor-kwarg, and schema-shaped failures.
- Observed at
- Unknown · not established
- Evidence
- Kind
- url
- Value
- https://pytest-django.readthedocs.io/en/latest/database.html
- Note
- S1; official_documentation; accessed 2026-09-17
- Kind
- url
- Value
- https://docs.djangoproject.com/en/6.1/topics/testing/overview/
- Note
- S2; official_documentation; accessed 2026-09-17
- Kind
- url
- Value
- https://docs.djangoproject.com/en/6.1/topics/testing/advanced/
- Note
- S3; official_documentation; accessed 2026-09-17
- Kind
- url
- Value
- https://docs.djangoproject.com/en/6.1/ref/django-admin/
- Note
- S4; official_documentation; accessed 2026-09-17
- Kind
- url
- Value
- https://docs.pytest.org/en/stable/how-to/usage.html
- Note
- S5; official_documentation; accessed 2026-09-17
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