django - Rest Framework 序列化程序方法字段

Question

class BagSerializer(serializers.ModelSerializer):
    order_date = serializers.SerializerMethodField()

    class Meta:
        model = Bag
        fields = ('order_date')

    def get_order_date(self, obj):
        print('Order date called', obj)

这是 View :

class BagViewSet(viewsets.ModelViewSet):
queryset = Bag.objects.all()
serializer_class = BagSerializer

    def create(self, request):
        try:
            print('Inside create viewset')
            serializer = self.get_serializer(data=request.data)
            if serializer.is_valid():
                print('serializer passed', serializer.validated_data)
            else:
                print('Serializer failed', serializer.errors)
                return Response(serializer.errors)
        except Exception as e:
        print('exception raised--------', e)
    return Response('Boom')

序列化器方法字段未被调用，其数据也未显示在 validated_data 中，序列化器的 is_valid() 方法返回 True。 为什么不考虑序列化程序方法字段

Answer 1

SerializerMethodField是只读字段。来自docs :

Read-only fields are included in the API output, but should not be included in the input during create or update operations. Any 'read_only' fields that are incorrectly included in the serializer input will be ignored.

如果 order_date 与某些模型字段相关，您可以使用 DateField 和 source 参数:

order_date = serializers.DateField(source='model_field_name')