Python Django 使用具有多对多关系的嵌套序列化程序发送发布请求.收到 [400 错误代码]此字段可能不为空] 错误

我是Django的新手，我正在try 用嵌套对象发出POST请求.这是我要发送的数据:

{
   "id":null,
   "deleted":false,
   "publishedOn":2022-11-28,
   "decoratedThumbnail":"https://t3.ftcdn.net/jpg/02/48/42/64/360_F_248426448_NVKLywWqArG2ADUxDq6QprtIzsF82dMF.jpg",
   "rawThumbnail":"https://t3.ftcdn.net/jpg/02/48/42/64/360_F_248426448_NVKLywWqArG2ADUxDq6QprtIzsF82dMF.jpg",
   "videoUrl":"https://www.youtube.com/watch?v=jNQXAC9IVRw",
   "title":"Video with tags",
   "duration":120,
   "visibility":1,
   "tags":[
      {
         "id":null,
         "videoId":null,
         "videoTagId":42
      }
   ]
}

下面是这些对象在数据库上的关系的简图

我想创建一个视频并传入一个嵌套数据数组，这样我就可以创建多个标记，这些标记可以在多对多关系中与视频相关联.正因为如此，当发送数据时，视频的‘id’字段将为空，并且标签对象内的‘avioID’也将为空.然而，我一直收到400 (Bad request)错误，显示为{tags: [{videoId: [This field may not be null.]}]}

我正在try 覆盖VideoManageSerializer中的create方法，这样我就可以提取标签，在创建视频之后，我可以使用该视频来创建那些标签.我甚至不认为我正在进入VideoManageSerializer中的create方法部分，因为视频不是在数据库中创建的.我在这个问题上困了好几天了.如果有人能为我指明正确的方向，我将不胜感激.

我正在使用以下序列化程序:

class VideoManageSerializer(serializers.ModelSerializer):
    tags =  VideoVideoTagSerializer(many=True)

    class Meta:
        model = Video
        fields = ('__all__')
    
    # POST
    def create(self, validated_data):
        tags = validated_data.pop('tags')
        video_instance = Video.objects.create(**validated_data)
        for tag in tags:
            VideoVideoTag.objects.create(video=video_instance, **tag)
        return video_instance

class VideoVideoTagSerializer(serializers.ModelSerializer):
    class Meta:
        model = VideoVideoTag
        fields = ('__all__')

这是使用VideoManageSerializer的视图

class VideoManageViewSet(GenericViewSet,  # generic view functionality
                 CreateModelMixin,  # handles POSTs
                 RetrieveModelMixin,  # handles GETs 
                 UpdateModelMixin,  # handles PUTs and PATCHes
                 ListModelMixin):
    serializer_class = VideoManageSerializer
    queryset = Video.objects.all()

这些都是我正在使用的型号:

class Video(models.Model):
    decoratedThumbnail = models.CharField(max_length=500, blank=True, null=True)
    rawThumbnail = models.CharField(max_length=500, blank=True, null=True)
    videoUrl = models.CharField(max_length=500, blank=True, null=True)
    title = models.CharField(max_length=255, blank=True, null=True)
    duration = models.PositiveIntegerField()
    visibility = models.ForeignKey(VisibilityType, models.DO_NOTHING, related_name='visibility')
    publishedOn = models.DateField()
    deleted = models.BooleanField(default=0)
    
    class Meta:
        managed = True
        db_table = 'video'

class VideoTag(models.Model):
    name = models.CharField(max_length=100, blank=True, null=True)
    deleted = models.BooleanField(default=0)

    class Meta:
        managed = True
        db_table = 'video_tag'

class VideoVideoTag(models.Model):
    videoId = models.ForeignKey(Video, models.DO_NOTHING, related_name='tags', db_column='videoId')
    videoTagId = models.ForeignKey(VideoTag, models.DO_NOTHING, related_name='video_tag', db_column='videoTagId')

    class Meta:
        managed = True
        db_table = 'video_video_tag'