      name = models.CharField(max_length=100)
  
  
  class FancyDoodad(Doodad):
      owner = models.ForeignKey(Collector)
      expensive = models.BooleanField(default=True)
  
  
  @python_2_unicode_compatible
  class Category(models.Model):
 
</s> remove     owner = models.ForeignKey(Collector)
 </s> add     owner = models.ForeignKey(Collector, models.CASCADE) </s> remove     owner = models.ForeignKey(Collector)
 </s> add     owner = models.ForeignKey(Collector, models.CASCADE) </s> remove     owner = models.ForeignKey(Collector)
 </s> add     owner = models.ForeignKey(Collector, models.CASCADE) </s> remove     owner = models.ForeignKey(Collector)
 </s> add     owner = models.ForeignKey(Collector, models.CASCADE) </s> remove     collector = models.ForeignKey(Collector)
 </s> add     collector = models.ForeignKey(Collector, models.CASCADE)
    owner = models.ForeignKey(Collector, models.CASCADE)
      name = models.CharField(max_length=100)
  
  
  class FancyDoodad(Doodad):
    owner = models.ForeignKey(Collector, models.CASCADE)
      expensive = models.BooleanField(default=True)
  
  
  @python_2_unicode_compatible
  class Category(models.Model):
keep keep keep keep replace keep keep keep keep keep
 Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField 
tests/admin_views/models.py