Django trying to add "_id" to the primary key OneToOne column - django

Question

Just started Django.
I have 2 models. Radusergroup and expiration. username is primary key on Radusergroup and a OnetoOne Field in expiration with primary_key=True. Django is trying query for username_id in expiration model although the field itself is username only.
When I dont explicitly define Managed=False it also tries to change the username field in expiration table from the database to username_id as well.
What am I doing wrong here ?
class Radusergroup(models.Model):
username = models.CharField(max_length=64,primary_key=True)
groupname = models.CharField(max_length=64)
priority = models.IntegerField()
class Meta:
managed = False
class expiration(models.Model):
username = models.OneToOneField(Radusergroup,on_delete=models.CASCADE, to_field='username', primary_key=True)
expiration = models.DateTimeField()
class Meta:
managed = False
python .\manage.py shell
>>> help(expiration())
Help on expiration in module panel_app.models object:
class expiration(django.db.models.base.Model)
| expiration(*args, **kwargs)
|
| expiration(username, expiration)
|
| Method resolution order:
| expiration
| django.db.models.base.Model
| builtins.object
|
| Methods defined here:
|
| expiration = <django.db.models.query_utils.DeferredAttribute object>
| get_next_by_expiration = _method(self, *, field=<django.db.models.fields.DateTimeField: expiration>, is_next=True, **
kwargs)
|
| get_previous_by_expiration = _method(self, *, field=<django.db.models.fields.DateTimeField: expiration>, is_next=Fals
e, **kwargs)
|
| username_id = <django.db.models.query_utils.DeferredAttribute object>
| ----------------------------------------------------------------------

Answer 1

Thanks dirkgroten for pointing me to the right direction.
Adding db_column solved my problem
class expiration(models.Model):
username = models.OneToOneField(Radusergroup,on_delete=models.PROTECT, to_field='username',db_column="username" , primary_key=True)