id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27338	Running an AlterField to change a CharField primary key to AutoField crashes.	Tim Graham	nobody	"For example: change `id = models.CharField(max_length=20, primary_key=True)` to `id = models.AutoField(primary_key=True)`. It generates this operation:
{{{
migrations.AlterField(
    model_name='foo',
    name='id',
    field=models.AutoField(primary_key=True, serialize=False),
),
}}}
Running it on PostgreSQL gives: `django.db.utils.ProgrammingError: operator class ""varchar_pattern_ops"" does not accept data type integer`. I'm not sure if this can be made to work sensibly. Is it possible to autopopulate the `AutoField`? I ran into this situation while investigating #27267."	Cleanup/optimization	closed	Migrations	dev	Normal	fixed			Accepted	0	0	0	0	0	0