Save with update_fields did not affect any rows (while changing class)
Let's have a model with decorator: def upgradable(model): #classmethod def upgrade(cls, base, **kwargs): base.__class__ = cls for attr, value in kwargs.items(): setattr(base, attr, value) return base setattr(model, "upgrade", upgrade) return model class Person(models.Model): name = models.CharField(max_length=50) def save(self, *args, **kwargs): self.name = self.name.upper() super(Person, self).save(*args, **kwargs) and inherited model: #upgradable class User(Person): email = models.EmailField(); and I'm trying to upgrade person = Person.objects.get(...) user = User.upgrade(person, email="example#example.com") user.save() But the error appears: Save with update_fields did not affect any rows. in connection to super(Person, self).save(*args, **kwargs) (in method save of model person) It isn't total wrong, because indeed I don't want to change anything in table person, I just want to add something to table user (pointer to person and email). So how to skip this warning?
The answer wasn't obvious - I tried to add user.save(force_update = True) but it isn't work. But user.save(force_insert = True) do the job. Strange, but works.
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