如何在Django中映射对象?

假设我的POST方法中有三个字段- field1 , field2 , field3 和 字段3 在添加到数据库期间应具有相同的值。因此不需要添加例如 field2=2 , field3=2 手动。我只能补充 field1=1 , 字段2=2 然后 字段3=2

意见。py:

class UserObject(GenericAPIView):

    def get_serializer_class(self, *args, **kwargs):
        if self.request.method == 'POST':
            return ObjectPostSerializer
        return ObjectSerializer

    def post(self, request, user_id):

        serializer = ObjectPostSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save(user_id=user_id)
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

序列化程序。py:

class ObjectPostSerializer(serializers.ModelSerializer):

    def __init__(self, *args, **kwargs):
        super(ObjectPostSerializer, self).__init__(*args, **kwargs)

        for key in self.fields:
            self.fields['field3'].required = False

    class Meta:

        model=Object
        field3 = model.field2

        fields = ('__all__')