#23422: Cannot add Permission to Group in data migration
----------------------------+--------------------------------------
Reporter: tjwalch | Owner: nobody
Type: Bug | Status: closed
Component: Migrations | Version: 1.7
Severity: Normal | Resolution: wontfix
Keywords: | 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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Comment (by frnhr):
The solution jwhitlock proposes with calling `create_permissions` from
migration fixed one of my problematic migration, but not another. The
other migration is calling `loaddata` command to do a one-time fixture
import, and it was failing because required `ContentType` objects haven't
been created. So it seems to be another face of the same problem.
Here is a more dirty workaround until an official solution becomes
available. I think it has better changes of fixing the problem in case
solution with `create_permissions` fails:
{{{
if ContentType.objects.filter(**whats_needed_for_this_migration).count() <
1:
print("Running another migrate command from migration to create
ContentType objects:")
call_command('migrate', 'users', '0002') # this should cite migration
from the same app, just prior to this one
print("Finished with the migrate command.")
}}}
I'm guessing the only thing really needed from the `migrate` management
command in this situation is:
{{{
emit_post_migrate_signal(created_models, self.verbosity, self.interactive,
connection.alias)
}}}
but not sure how to populate the arguments.
I have no idea if using `call_command("migrate")` from a migration (of all
places...) can be problematic, but in my particular case there don't seem
to be any problems.
The lengths we have to go to... Please **willfix** this.
--
Ticket URL: <https://code.djangoproject.com/ticket/23422#comment:18>
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