DRF IntegrityError:NOT NULL约束失败:user_id

时间:2018-09-26 12:56:23

标签: django rest django-models django-rest-framework django-database

我不知道如何将用户对象传递给以下序列化器:

class ReviewSerializer(serializers.ModelSerializer):
    user = UserSerializer(read_only=True)

    class Meta:
        model = Review
        fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'review_text',)

我有这个观点集:

class ReviewsViewSet(viewsets.ModelViewSet):
    queryset = Review.objects.all()
    serializer_class = ReviewSerializer

和此模型:

class Review(models.Model):
    title = models.CharField(max_length=255)
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='reviews')
    movie = models.ForeignKey(Movie, on_delete=models.CASCADE, related_name='reviews')
    review_text = models.TextField()
    timestamp = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return '{movie} review by {user}'.format(user=self.user, movie=self.movie)

我的JavaScript请求如下:

return axios({
  method: 'post',
  url: 'http://localhost:8000/api/reviews/',
  data: { // Using data from Vue
    title: this.review_title,
    movie: this.id,
    review_text: this.review_text,
    user: JSON.stringify(this.user)
  },
  headers: {
    'Content-Type': 'application/json',
    Authorization: `JWT ${token}`
  }
})

它给了我this traceback

如何将用户对象传递给请求?

谢谢。

1 个答案:

答案 0 :(得分:2)

从序列化程序中删除 read_only=True

class ReviewSerializer(serializers.ModelSerializer):
    user = UserSerializer()

    class Meta:
        model = Review
        fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'review_text',)

如果设置了 read_only=True ,则DRF 将不会从输入源中获取值 ,即使该值存在

From the doc,

  

API输出中包含只读字段,但不应包含   在创建或更新操作期间包含在输入中。任何   错误地包含在序列化器中的“ read_only”字段   输入将被忽略。

     

将此设置为 True ,以确保序列化   表示形式,但在创建或更新实例时不使用   在反序列化期间。

     

默认为 False


更新
您应将 create() ReviewSerializer 方法改写为

class ReviewSerializer(serializers.ModelSerializer):
    user = UserSerializer()

    def create(self, validated_data):
        user_dict = validated_data.pop('user')
        user_obj, created = User.objects.get_or_create(**user_dict)
        return Review.objects.create(user=user_obj, **validated_data)

    class Meta:
        model = Review
        fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'review_text',)



仅用于调试目的

class ReviewsViewSet(viewsets.ModelViewSet):
    queryset = Review.objects.all()
    serializer_class = ReviewSerializer

    def create(self, request, *args, **kwargs):
        print(request.data)  # print here <<<<
        return super(ReviewsViewSet, self).create(request, *args, **kwargs)