      about = models.TextField()
  
  
  class ProfileNetwork(models.Model):
      profile = models.ForeignKey(UserProfile, to_field="user")
      network = models.IntegerField()
      identifier = models.IntegerField()
  
  
  class Place(models.Model):
 
</s> remove     user = models.ForeignKey(User, unique=True, to_field="username")
 </s> add     user = models.ForeignKey(User, models.CASCADE, unique=True, to_field="username") </s> remove     holder = models.ForeignKey(Holder2)
 </s> add     holder = models.ForeignKey(Holder2, models.CASCADE) </s> remove     self_data = models.ForeignKey('self', null=True)
 </s> add     self_data = models.ForeignKey('self', models.SET_NULL, null=True) </s> remove     user = models.ForeignKey(User, to_field="username")
 </s> add     user = models.ForeignKey(User, models.CASCADE, to_field="username") </s> remove     network = models.ForeignKey(Network)
 </s> add     network = models.ForeignKey(Network, models.CASCADE)
    profile = models.ForeignKey(UserProfile, models.CASCADE, to_field="user")
      about = models.TextField()
  
  
  class ProfileNetwork(models.Model):
    profile = models.ForeignKey(UserProfile, models.CASCADE, to_field="user")
      network = models.IntegerField()
      identifier = models.IntegerField()
  
  
  class Place(models.Model):
keep keep keep keep replace keep keep keep keep keep
 Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField 
tests/model_formsets_regress/models.py