Question

models.py

class BaseComment(models.Model):
    comment_author = models.ForeignKey(MyUser, related_name='written_comments')
    comment_content = models.CharField(max_length=500)
    comment_date = models.DateTimeField(auto_now_add=True)
    rating = models.IntegerField(default=0)
    users_voted = models.ManyToManyField(MyUser, related_name='voted_comments')

    class Meta:
        abstract = True
        ordering = ['-comment_date']        

    def __unicode__(self):
        return self.comment_author.email

class QuestionComment(BaseComment):
    question = models.ForeignKey(Question, related_name='comments')

class AnswerComment(BaseComment):
    answer = models.ForeignKey(Answer, related_name='comments')

这是我的models.py。当我运行syncdb时，我收到此错误：

CommandError: One or more models did not validate:

app_quora.questioncomment: Accessor for field 'comment_author' clashes with rela
ted field 'MyUser.written_comments'. Add a related_name argument to the definiti
on for 'comment_author'.
app_quora.questioncomment: Reverse query name for field 'comment_author' clashes
 with related field 'MyUser.written_comments'. Add a related_name argument to th
e definition for 'comment_author'.
app_quora.questioncomment: Accessor for m2m field 'users_voted' clashes with rel
ated m2m field 'MyUser.voted_comments'. Add a related_name argument to the defin
ition for 'users_voted'.
app_quora.questioncomment: Reverse query name for m2m field 'users_voted' clashe
s with related m2m field 'MyUser.voted_comments'. Add a related_name argument to
 the definition for 'users_voted'.
app_quora.answercomment: Accessor for field 'comment_author' clashes with relate
d field 'MyUser.written_comments'. Add a related_name argument to the definition
 for 'comment_author'.
app_quora.answercomment: Reverse query name for field 'comment_author' clashes w
ith related field 'MyUser.written_comments'. Add a related_name argument to the 
definition for 'comment_author'.
app_quora.answercomment: Accessor for m2m field 'users_voted' clashes with relat
ed m2m field 'MyUser.voted_comments'. Add a related_name argument to the definit
ion for 'users_voted'.
app_quora.answercomment: Reverse query name for m2m field 'users_voted' clashes 
with related m2m field 'MyUser.voted_comments'. Add a related_name argument to t
he definition for 'users_voted'.

好吧，错误告诉我为“comment_author”和“users_voted”添加“related_name”，我已经做过了！我在stackoverflow上查找了类似的问题，但通常问题是人们没有用于冲突字段的“related_name”。

我添加了这些字段，但仍然收到此错误...有人可以解释原因吗？

谢谢:(（

Answer 1

您看到的问题是由于ForeignKey模型中的ManyToManyField和BaseComment字段。因为它是一个抽象模型，所以django不会为它创建一个表。

但是，继承字段的派生模型QuestionComment和AnswerComment会尝试添加related_name（written_comments，voted_comments）定义的相同字段MyUser模型。因为您只能有一个具有相同名称的字段，所以会为您提供这些错误。

解决方案是不要将BaseComment作为抽象模型，让它拥有自己的表/模型。

或者，您可以在派生模型中添加这些字段。

您也可以尝试不指定related_name并让django决定名称，但我不确定这是否有效。

Django“将”related_name“参数添加到定义”错误

1 个答案: