Question

我正在使用Django rest framework 3.2.1，GET是完美的，但POST不起作用。

这是模特：

class Sample(models.Model):
    ownerBuilding = models.ForeignKey(Building)
    coordinateX = models.IntegerField(default=0, help_text='X coordinate for this sampling point located in a building')
    coordinateY = models.IntegerField(default=0, help_text='Y coordinate for this sampling point located in a building')
    creation_Time = models.DateTimeField(auto_now_add=True)
    description = models.TextField(null=True,
                               help_text='additional description for this sample point.')

class Meta:
    unique_together = ('ownerBuilding', 'coordinateX','coordinateY')

def __str__(self):
    return "Sample for building " + str(self.ownerBuilding)

The Serializer：

class SampleSerializer(serializers.HyperlinkedModelSerializer):
    ownerBuilding = serializers.HyperlinkedRelatedField(many=False, read_only=True, view_name='building-detail')

class Meta:
    model = Sample
    fields = ('url', 'ownerBuilding', 'coordinateX', 'coordinateY', 'creation_Time','description')

观点：

class SampleList(generics.ListCreateAPIView):
    queryset = Sample.objects.all()
    serializer_class = SampleSerializer
    permission_classes = (permissions.IsAuthenticated, IsTechniciansGroupOrReadOnly,)

    def get_queryset(self):
        queryset = Sample.objects.all()
        ownerBuildingId = self.request.query_params.get('ownerBuildingId', None)

        if ownerBuildingId is not None:
            queryset = queryset.filter(ownerBuilding=ownerBuildingId)

        return queryset

当我使用数据测试POST此API时：

{"ownerBuilding":"http://rest.xxxxxxxx.xyz:8090/buildings/1/","coordinateX":33,"coordinateY":44,"description":"5dfadfasdfsadf5"}

我总是收到这个错误：

{
    "ownerBuilding": [
        "This field is required."
    ]
}

任何人都可以提供帮助吗？

http://rest.xxxxxxxx.xyz:8090/buildings/1/存在。

[edit0]：如果我POST使用：

{"coordinateX":33,"coordinateY":44,"description":"5dfadfasdfsadf5"}

我仍然得到相同的结果。

Answer 1

序列化程序字段为required by default。

此外，DRF ModelSerializer（和HyperlinkedModelSerializer）为所有模型的UniqueTogetherValidator约束添加了unique_together个。这隐式地使得约束中的所有字段都必需，对于设置了默认值的字段除外。请参阅doc。

ownerBuilding仅在序列化程序上读取：

ownerBuilding = serializers.HyperlinkedRelatedField(many=False, \
                            read_only=True, view_name='building-detail')

但是您没有提供defualt也没有手动设置值，因此该字段被视为空，因此出现错误消息。

删除read_only或设置默认值。

发布到Django休息框架API但始终得到“此字段是必需的”错误

1 个答案: