DRF IntegrityError: NOT NULL constraint failed: user_id

Question

我不知道如何将用户对象传递给以下序列化程序：

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

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

我有这个视图集：

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

和这个模型：

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 请求如下所示：

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.

我应该如何将用户对象传递给请求？

提前致谢。

Answer 1

从序列化器

中删除read_only=True

class ReviewSerializer(serializers.ModelSerializer):
    <b>user = UserSerializer()</b>

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

如果您设置read_only=True，DRF 将不会从输入源[获取值=45=] 即使它在那里

From the doc,

Read-only fields are included in the API output, but should not be included in the input during create or update operations. Any 'read_only' fields that are incorrectly included in the serializer input will be ignored.

Set this to True to ensure that the field is used when serializing a representation, but is not used when creating or updating an instance during deserialization.

Defaults to False

更新
您应该将 ReviewSerializer 的 create() 方法重写为

class ReviewSerializer(serializers.ModelSerializer): <b>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)</b> 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)

DRF IntegrityError: NOT NULL constraint failed: user_id

DRF IntegrityError: NOT NULL constraint failed: user_id

django

rest

django-models

django-database

django-rest-framework