python - 如何反序列化 django rest 框架中的多个对象列表？

Question

我正在开发一个 rest API，它获取由多个对象组成的请求并将它们保存到数据库中。然后，返回另一个对象数组作为响应。所有对象都只有一个模型。

class Ratings(models.Model):
    id = models.AutoField(primary_key = True)
    userId = models.IntegerField()
    movieId = models.IntegerField()
    rating = models.PositiveIntegerField(validators=[MinValueValidator(1), MaxValueValidator(5)])
    timestamp = models.DateTimeField(auto_now = True)

class RatingsSerializer(serializers.ModelSerializer):
    class Meta:
        model = Ratings
        fields = ('userId','movieId','rating')

class RecommendationGenerator(generics.ListCreateAPIView):
    queryset = Ratings.objects.all()
    serializer_class= RatingsSerializer
    def post(self, request, format='json'):
        serializer= RatingsSerializer(data = request.data, many = True)
        if serializer.is_valid():
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        else:
            return Response(serializer.errors, status=status.HTTP_403_FORBIDDEN)

当我在 Postman 中使用 JSON 测试它时:

[
    {
        "userId": 13,
        "movieId": 1765,
        "rating": 5
    },
    {
        "userId": 13,
        "movieId": 1733,
        "rating": 3
    },
    {
        "userId": 13,
        "movieId": 1713,
        "rating": 2
    },
    {
        "userId": 13,
        "movieId": 963,
        "rating": 2
    }
]

结果是[]。但是对于

{
    "userId": 13,
    "movieId": 1765,
    "rating": 5
}

结果是

{
    "userId": 13,
    "movieId": 1765,
    "rating": 5
}

如何反序列化这些数据？我在这里做错了什么？

Answer 1

观点应该是这样的

class RecommendationGenerator(generics.ListCreateAPIView):
    queryset = Ratings.objects.all()
    serializer_class= RatingsSerializer

    def post(self, request, format='json'):
        serializer= RatingsSerializer(data = request.data, many = True)
        if serializer.is_valid():
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        else:
            return Response(serializer.errors, status=status.HTTP_403_FORBIDDEN)

试试这个