#35589: AlterField should raise an error when changing primary key
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     Reporter:  Csirmaz Bendegúz  |                     Type:  New feature
       Status:  new               |                Component:  Migrations
      Version:  dev               |                 Severity:  Normal
     Keywords:  primary key       |             Triage Stage:  Unreviewed
    Has patch:  0                 |      Needs documentation:  0
  Needs tests:  0                 |  Patch needs improvement:  0
Easy pickings:  0                 |                    UI/UX:  0
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 At the moment, AlterField doesn't do anything if changing
 `primary_key=False` -> `primary_key=True` or
 `primary_key=True` -> `primary_key=False`.

 The same goes for `CompositePrimaryKey` fields (when/if they are merged
 #373).

 Since changing the primary key is not supported by Django, AlterField
 should raise an error instead of silently failing.
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Ticket URL: <https://code.djangoproject.com/ticket/35589>
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