#28862: Removing a field from index_together/unique_together and from the model
generates a migration that crashes
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Reporter: Artem Maslovskiy | Owner: Jeff
Type: Bug | Status: assigned
Component: Migrations | Version: 1.9
Severity: Normal | Resolution:
Keywords: models migrations | 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 Jeff):
Looking into overwriting the `FieldRelatedOptionOperation`'s reduce method
to additionally:
1) check if the current operation is a `RemoveField` (and maybe
`RenameField`, I need to confirm if it is also problematic)
2) if it is a `RemoveField` operation, to look into the model (as it
exists in the DB) and if the field being removed is in `unique_together`,
`index_together`, or `order_with_respect_to`, to skip the operation.
This would correct the optimizer's erroneous migrations and I do not think
would cause any other tests to fail.
I am still new to the codebase, could anyone point me in the right
direction on how I can get the current state of the table in the DB? Using
`apps.config`'s `get_model()` is returning the state of the model from
`models.py`, not the current state of the model as it exists in the DB. I
am trying to use `ProjectState` at the moment. I plan to continue down
this path, but please let me know if you can guide me to a more correct
method of inspecting the current DB table as a model.
--
Ticket URL: <https://code.djangoproject.com/ticket/28862#comment:17>
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