#24506: Proxying User model creates an invalid migration
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Reporter: tinloaf | Owner:
| marcofucci
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Ernest0x):
I added an example project as an attachment. Running 'migrate' reproduces
the problem. The traceback above is shown when running the 'migrate'
command for a second time as well as for subsequent runs. The first run
also produces a traceback, which seems to be the same error but triggered
in a different code path.
The project's history/migrations:
1) 'myapp' application has a MyModel model with a text field / The
Django's default user model is being used (no AUTH_USER_MODEL is set).
2) 'myapp' application's MyModel gets a foreign key to 'auth.Group'
3) 'users' application is added to INSTALLED_APPS. It contains a custom
User model.
4) 'users' application gets a new Group model as a proxy to auth.Group and
MyModel's foreign key is changed to point to 'users.Group'.
AUTH_USER_MODEL is changed to 'users.User'
5) 'myapp' application's MyModel gets a new text field. Migration file for
this change is created without problems, but running 'migrate' fails with
the trace above.
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Ticket URL: <https://code.djangoproject.com/ticket/24506#comment:8>
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