#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
-------------------------------+------------------------------------
Comment (by Carsten Fuchs):
Don't know why I didn't see this earlier, but I can reproduce this with
even simpler model definitions: the FK to self is not needed, having a
many2many field is enough:
{{{
#!python
# models.py
from django.db import models
class Kostenstelle(models.Model):
#id = models.AutoField(primary_key=True)
id = models.IntegerField(primary_key=True, help_text="...")
class KalenderEintrag(models.Model):
id = models.AutoField(primary_key=True)
kst = models.ManyToManyField(Kostenstelle, blank=True)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/30152#comment:9>
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