  
  
  @python_2_unicode_compatible
  class Comment(models.Model):
      article = models.ForeignKey(Article, related_name="comments")
      text = models.TextField()
      pub_date = models.DateTimeField()
      approval_date = models.DateTimeField(null=True)
  
      def __str__(self):
 
</s> remove     article = models.ForeignKey(Article, related_name="comments")
 </s> add     article = models.ForeignKey(Article, models.CASCADE, related_name="comments") </s> remove     article = models.ForeignKey('indexes.Article')
 </s> add     article = models.ForeignKey('indexes.Article', models.CASCADE) </s> remove     content_type = models.ForeignKey(ContentType)
 </s> add     content_type = models.ForeignKey(ContentType, models.CASCADE) </s> remove     author = models.ForeignKey(Author)
 </s> add     author = models.ForeignKey(Author, models.CASCADE) </s> remove     color = models.ForeignKey(Color, limit_choices_to={'warm': True})
 </s> add     color = models.ForeignKey(Color, models.CASCADE, limit_choices_to={'warm': True})
    article = models.ForeignKey(Article, models.CASCADE, related_name="comments")
  
  
  @python_2_unicode_compatible
  class Comment(models.Model):
    article = models.ForeignKey(Article, models.CASCADE, related_name="comments")
      text = models.TextField()
      pub_date = models.DateTimeField()
      approval_date = models.DateTimeField(null=True)
  
      def __str__(self):
keep keep keep keep replace keep keep keep keep keep
 Fixed #21127 -- Started deprecation toward requiring on_delete for ForeignKey/OneToOneField 
tests/datetimes/models.py