  
  @python_2_unicode_compatible
  class Parcel(SimpleModel):
      name = models.CharField(max_length=30)
      city = models.ForeignKey(City)
      center1 = models.PointField()
      # Throwing a curveball w/`db_column` here.
      center2 = models.PointField(srid=2276, db_column='mycenter')
      border1 = models.PolygonField()
      border2 = models.PolygonField(srid=2276)
 
</s> remove     city = models.ForeignKey(City)
 </s> add     city = models.ForeignKey(City, models.CASCADE) </s> remove     location = models.ForeignKey(AugmentedLocation)
 </s> add     location = models.ForeignKey(AugmentedLocation, models.CASCADE) </s> remove     city = models.ForeignKey(City)
 </s> add     city = models.ForeignKey(City, models.CASCADE) </s> remove     group = models.ForeignKey(Group)
 </s> add     group = models.ForeignKey(Group, models.CASCADE) </s> remove     owner = models.ForeignKey(User)
 </s> add     owner = models.ForeignKey(User, models.CASCADE)
    city = models.ForeignKey(City, models.CASCADE)
  
  @python_2_unicode_compatible
  class Parcel(SimpleModel):
      name = models.CharField(max_length=30)
    city = models.ForeignKey(City, models.CASCADE)
      center1 = models.PointField()
      # Throwing a curveball w/`db_column` here.
      center2 = models.PointField(srid=2276, db_column='mycenter')
      border1 = models.PolygonField()
      border2 = models.PolygonField(srid=2276)
keep keep keep keep replace keep keep keep keep keep
 Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField 
tests/gis_tests/relatedapp/models.py