      """
      # Avoid validation
      requires_unique_target = False
  
      def __init__(self, to, from_fields, to_fields, **kwargs):
          # Disable reverse relation
          kwargs['related_name'] = '+'
          # Set unique to enable model cache.
          kwargs['unique'] = True
          super(CurrentTranslation, self).__init__(to, from_fields, to_fields, **kwargs)
 
</s> remove         super(CurrentTranslation, self).__init__(to, from_fields, to_fields, **kwargs)
 </s> add         super(CurrentTranslation, self).__init__(to, on_delete, from_fields, to_fields, **kwargs) </s> remove     reporter = models.ForeignKey(ProxyTrackerUser)
    associated_bug = models.ForeignKey(ProxyProxyBug)
 </s> add     reporter = models.ForeignKey(ProxyTrackerUser, models.CASCADE)
    associated_bug = models.ForeignKey(ProxyProxyBug, models.CASCADE) </s> remove             content_type = models.ForeignKey('self')  # should point to ContentType
 </s> add             content_type = models.ForeignKey('self', models.CASCADE)  # should point to ContentType </s> remove     translation = CurrentTranslation(ArticleTranslation, ['id'], ['article'])
 </s> add     translation = CurrentTranslation(ArticleTranslation, models.CASCADE, ['id'], ['article'])
    def __init__(self, to, on_delete, from_fields, to_fields, **kwargs):
      """
      # Avoid validation
      requires_unique_target = False
  
    def __init__(self, to, on_delete, from_fields, to_fields, **kwargs):
          # Disable reverse relation
          kwargs['related_name'] = '+'
          # Set unique to enable model cache.
          kwargs['unique'] = True
          super(CurrentTranslation, self).__init__(to, from_fields, to_fields, **kwargs)
keep keep keep keep replace keep keep keep keep keep
 Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField 
tests/indexes/models.py