#36239: ManyToManyField check error with invalid "to" when passing
through/through_fields
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Reporter: Jordan Hyatt | Owner:
| JaeHyuckSa
Type: Bug | Status: assigned
Component: Core (System | Version: 5.1
checks) |
Severity: Normal | Resolution:
Keywords: check | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Comment (by Tanishq):
Fixes #36239: Prevents `AttributeError: 'str' object has no attribute
'_meta'` in `ManyToManyField` when `to` is invalid with
`through`/`through_fields`.
- **Issue**: The validation framework assumed `related_model` was always
resolved, causing a crash when it remained a string.
- **Fix**: If `related_model` is a string, we handle it gracefully in
`_check_relationship_model`.
- **Test**: Added test in `tests/model_fields/tests.py` to confirm
expected error messages (`E300`, `E339`).
- **Impact**: Prevents crashes and ensures Django correctly raises
validation errors instead.
https://github.com/django/django/pull/19301
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Ticket URL: <https://code.djangoproject.com/ticket/36239#comment:12>
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