#23226: Migrations generated by python2 break when using python3 to migrate
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Reporter: morshed.nader@… | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.7-rc-2
Severity: Release blocker | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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It seems that the use of byte strings in the files generated by `python2
manage.py makemigrations <module>` cause migrations to break when running
`python3 manage.py migrate`. This seems to be caused by the use of byte
strings in the model field names, as replacing all instances of `b''` with
`''` fixes the issue.
I have created a simple demo project that will cause an error to be throw
during migrations. This includes migrations already generated by Python2 +
Django-1.7rc2 + makemigrations:
https://github.com/naderm/django-migrations-test
Which throws the exception:
{{{
$ python3 manage.py migrate
...
django.db.models.fields.FieldDoesNotExist: ModelTest has no field named
b'season'
$ python2 manage.py migrate
Operations to perform:
Apply all migrations: admin, contenttypes, migratemodule, auth, sessions
Running migrations:
Applying migratemodule.0001_initial... OK
Applying sessions.0001_initial... OK
}}}
The case here uses a unique_together constraint that causes the exception
to be thrown, but I have also seen the same error generated by the use of
foreign keys and many to many relations.
--
Ticket URL: <https://code.djangoproject.com/ticket/23226>
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