在django休息框架中如何将绝对url字段放入序列化器模型？ [英] how to put absolute url field in serializer model in django rest framework?

问题描述

我有一个这样的模型：

class GiveAbsolute(serializers.Field):
    def to_native(self,value): 
         # this where it give an error (self doesn't have request)
         # what i want it to give full url 
         # like: http://www.blabla.com/othermodel/1
         return reverse('link_to_othermodel',
                         args=[value],
                         request=self.request)

class SomethingSerializer(serializers.ModelSerializer):
    # field with foreign key
    othermodel = GiveAbsolute(source="othermodel.id")
    class Meta:
        model=Something
        fields("fields1","othermodel")

有没有办法实现？
谢谢

is there a way to achieve this ? thanks

推荐答案

DRF中唯一可以访问请求对象的是该视图，因此您需要以了解如何将查询传递给序列化程序，例如在通用ListView中，您可以使用 get_serializer 。

The only thing in DRF, that has an access to request object is the view, so you need to figure out how to pass your request from view to serializer, for example in generic ListView you can use get_serializer.

然后，当你已经在你的序列化程序中，你可以使用 self.parent （它是一个父级序列化程序）从字段本身捕获它：

Then, when you already have it in your serializer, you can use self.parent (which is a parent serializer) to capture it from the field itself:

class GiveAbsolute(serializers.Field):
    def to_native(self,value):
        return reverse('link_to_othermodel',
                     args=[value],
                     request=self.parent.request)


class SomethingSerializer(serializers.ModelSerializer):
    # field with foreign key
    othermodel = GiveAbsolute(source="othermodel.id")
    class Meta:
        model=Something
        fields=("fields1","othermodel")

    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request', None)
        super(SomethingSerializer, self).__init__(*args, **kwargs)


class SomethingView(generics.ListAPIView):
    model = Something
    serializer_class = SomethingSerializer

    def get_serializer(self, instance=None, data=None,
                   files=None, many=False, partial=False):

        serializer_class = self.get_serializer_class()
        context = self.get_serializer_context()
        return serializer_class(instance, data=data, files=files, many=many,
                                partial=partial, context=context, request=self.request)

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