#30966: Migration crashes due to foreign key issue, depending on otherwise
irrelevant order on MySQL.
---------------------------------+------------------------------------
     Reporter:  Peter Thomassen  |                    Owner:  nobody
         Type:  Bug              |                   Status:  new
    Component:  Migrations       |                  Version:  master
     Severity:  Normal           |               Resolution:
     Keywords:  migration mySQL  |             Triage Stage:  Accepted
    Has patch:  0                |      Needs documentation:  0
  Needs tests:  0                |  Patch needs improvement:  0
Easy pickings:  0                |                    UI/UX:  0
---------------------------------+------------------------------------
Changes (by felixxm):

 * keywords:  migration => migration mySQL
 * version:  2.2 => master
 * component:  Database layer (models, ORM) => Migrations
 * stage:  Unreviewed => Accepted


Comment:

 Thanks for this report, I confirmed this issue on MySQL. Scenario is
 really tricky, without the last operation i.e.
 {{{
         migrations.AlterField(
             model_name='rrset',
             name='subname',
             field=models.CharField(blank=False, max_length=178),
         ),
 }}}
 everything works fine. When we take it into account, migrations don't drop
 a `FOREIGN KEY` constraint from `desecapi_token`.

 Reproduced at 85efc14a2edac532df1a9ad4dd9b6d4a4dcf583e.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30966#comment:2>
Django <https://code.djangoproject.com/>
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