# django.core.exceptions.FieldError: Cannot resolve keyword 'tags' into field. Choices are: id, title, content

- **ID:** `python/django-many-to-many-relationship-error`
- **Domain:** python
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Attempting to query a many-to-many field that doesn't exist on the model.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   Check model definition: ensure ManyToManyField exists, then run makemigrations and migrate.
   ```
2. **** (85% success)
   ```
   Use the correct related_name: Post.tags.all() if related_name='tags'.
   ```

## Dead Ends

- **** — Adding the field to the model without running migrations doesn't make it available immediately. (60% fail)
- **** — Using the wrong related_name in query leads to same error. (70% fail)