#30691: Change uuid field to FK does not create dependency
     Reporter:  Dart        |                    Owner:  nobody
         Type:  Bug         |                   Status:  new
    Component:  Migrations  |                  Version:  master
     Severity:  Normal      |               Resolution:
     Keywords:  UUID, FK    |             Triage Stage:  Accepted
    Has patch:  0           |      Needs documentation:  0
  Needs tests:  0           |  Patch needs improvement:  0
Easy pickings:  0           |                    UI/UX:  0
Changes (by Carlton Gibson):

 * version:  2.2 => master
 * component:  Uncategorized => Migrations
 * stage:  Unreviewed => Accepted


 There's a lot of history in here, so it may turn out this is a duplicate,
 but I'll accept this for now, as there's certainly a bug.

 `makemigrations` generats this:

     dependencies = [
         ('testapp1', '0002_app1_another_app'),

     operations = [
             field=models.ForeignKey(blank=True, null=True,
 on_delete=django.db.models.deletion.SET_NULL, to='testapp2.App2',
 verbose_name='another app'),

 But that gives the `ValueError` as you say.

 Adjusting `dependencies` allows the test to pass:

     dependencies = [
         ('testapp1', '0002_app1_another_app'),
         ('testapp2', '0001_initial'),

 Thus, `AlterField` should pick this up.

 (Note for later: SQLite raised will required disabling constraint
 checking, ref #30023.)

Ticket URL: <https://code.djangoproject.com/ticket/30691#comment:1>
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