I'm writing a data migration in south to fix some denormalized data I screwed up in earlier code. The way to figure out the right value for the incorrect field is to call a static method on the django model class. The code looks like this:
class Account(models.Model):
name = models.CharField()
@staticmethod
def lookup_by_name(name):
# There's actually more to it than this
return Account.objects.get(name=name)
class Record(models.Model):
account_name = models.CharField()
acct = models.ForeignKey('Account')
...
class Migration(DataMigration):
def forwards(self, orm):
# Fixing Records with the wrong FK to Account
for record in orm.Record.objects.all():
record.acct = orm.Account.lookup_by_name(record.account_name)
record.save()
But this fails with
AttributeError: type object 'Account' has no attribute 'lookup_name'
I'm guessing south just doesn't support @staticmethod
s on model classes?
Trying to import Account directly fails, unless I also import Record directly and completley ignore the orm object. Is that a safe option, since it's a data migration and the schema isn't changing? Or should I just run this fix by hand rather than in the context of a south migration.