#30431: Migration hangs on non default database.
-------------------------------------+-------------------------------------
Reporter: mandm | Owner: nobody
Type: Bug | Status: closed
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: migrations, uuid, | worksforme
uuidfield, database router, | Triage Stage:
multiple database | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by felixxm):
* status: new => closed
* version: 1.11 => master
* resolution: => worksforme
Comment:
Thanks for the report, but described case works for me.
First of all you should use `schema_editor.connection.alias` in
`gen_uuid()` to fix it for multiple databases (see
[https://docs.djangoproject.com/en/stable/ref/migration-
operations/#runpython RunPython]), .e.g.
{{{#!python
def gen_uuid(apps, schema_editor):
UserModel = apps.get_model('myapp', 'customuser')
db_alias = schema_editor.connection.alias
for row in UserModel.objects.using(db_alias).all():
row.uniq_id = uuid.uuid4()
row.save(update_fields=['uniq_id'])
}}}
Secondly in mentioned documentation we have three separate migrations not
one. It depends on database but in e.g. PostgreSQL you will not be able to
alter column and update date in a single transaction. My advice is to
split migration files and use `schema_editor.connection.alias`.
Please use one of
[https://code.djangoproject.com/wiki/TicketClosingReasons/UseSupportChannels
support channels] if you need furher help.
--
Ticket URL: <https://code.djangoproject.com/ticket/30431#comment:4>
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