#30152: MySQL: "Cannot change column 'id': used in a foreign key constraint"
when
altering pk of model with ForeignKey to self
-------------------------------+------------------------------------
Reporter: Carsten Fuchs | Owner: Dart
Type: Bug | Status: assigned
Component: Migrations | Version: 2.2
Severity: Normal | Resolution:
Keywords: mysql | 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 Carsten Fuchs):
Hi Dart,
thanks for looking into this!
I too spent some time over the weeked trying to find out what's going on,
but both my knowledge about the Django internals and about databases is
little so that I did not get far.
I wonder why `_alter_field()` skips m2m fields at all? See
https://github.com/django/django/blob/1b8a26efa2e45ac471c969791e8c977e6d633091/django/db/backends/base/schema.py#L573
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Ticket URL: <https://code.djangoproject.com/ticket/30152#comment:8>
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