發送在用戶字段中創建新項目的帖子請求后出現錯誤-它在“user_id”列中返回空值違反了非空約束詳細信息：失敗行包含（61，我的公司，{2,3}，2020-08- 08 10:41:54.355926+00，我的描述，2、2，空）。. 我要以 JSON 格式發送的數據{    "name": "My Company",     "members":[2, 3] ,     "user": 2,     "description": "My desc",     "status": 2,     "theme": 2}serializers.pyclass AccountSerializer(serializers.ModelSerializer):    user=serializers.StringRelatedField(read_only=False)    class Meta:        model=Account        fields='__all__'class UserSerializer(serializers.ModelSerializer):    class Meta:        model = User        fields = '__all__'class CompanySerializer(serializers.ModelSerializer):    user = UserSerializer(read_only=True)    def __init__(self, *args, **kwargs):        super().__init__(*args, **kwargs)        try:            if self.context['request'].method in ['GET']:                self.fields['members'] = serializers.SerializerMethodField()        except KeyError:            pass    class Meta:        model = Company        fields = '__all__'            def get_members(self, obj):        accounts = Account.objects.filter(id__in=obj.members)        return AccountSerializer(accounts, many=True).data        class CompanyListSerializer(serializers.ModelSerializer):    class Meta:         model = Company        fields = '__all__'