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You now use another model as user model, so that means that you also use this to register users, so:
from users.models import User
class Athlete(models.Model):
user = models.OneToOneField(User, blank=True, null=True, on_delete=models.SET_NULL)
coach = models.ForeignKey(Coach, blank=True, null=True, on_delete=models.SET_NULL, related_name='coach')
def save(self, *args, **kwargs, email=None):
try:
self.user = User.objects.get(email=email)
except User.DoesNotExist:
self.user = new_user = User.objects.create_user(email=email)
super().save(*args, **kwargs)
Source:stackexchange.com