          verbose_name = "awesome guest"
  
  
  class EventGuide(models.Model):
      event = models.ForeignKey(Event, on_delete=models.DO_NOTHING)
  
  
  class Vehicle(models.Model):
      pass
  
 
</s> remove     event = models.OneToOneField(Event)
 </s> add     event = models.OneToOneField(Event, models.CASCADE) </s> remove     event = models.OneToOneField(Event, verbose_name='awesome event')
 </s> add     event = models.OneToOneField(Event, models.CASCADE, verbose_name='awesome event') </s> remove     title = models.ForeignKey(Title)
 </s> add     title = models.ForeignKey(Title, models.CASCADE) </s> remove     a1 = models.ForeignKey('lookuperror_a.A1')
 </s> add     a1 = models.ForeignKey('lookuperror_a.A1', models.CASCADE) </s> remove     a1 = models.ForeignKey('lookuperror_a.A1')
 </s> add     a1 = models.ForeignKey('lookuperror_a.A1', models.CASCADE)
    event = models.ForeignKey(Event, models.DO_NOTHING)
          verbose_name = "awesome guest"
  
  
  class EventGuide(models.Model):
    event = models.ForeignKey(Event, models.DO_NOTHING)
  
  
  class Vehicle(models.Model):
      pass
  
keep keep keep keep replace keep keep keep keep keep
 Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField 
tests/admin_utils/models.py