Django REST Fram中序列化程序“包括额外上下文”需要澄清

Question

根据：https://www.django-rest-framework.org/api-guide/serializers/#including-extra-context

我可以写：

serializer = AccountSerializer(account, context={'request': request})

然后serializer.data将看起来像：

# {'id': 6, 'owner': 'denvercoder9', 'created': datetime.datetime(2013, 2, 12, 09, 44, 56, 678870), 'details': 'http://example.com/accounts/6/details'}

但它没有说明我将如何实施它。我的意思是，它必须基于对rest_framework.reverse的调用，有点像在这个示例中：

class CompleteTaskModelSerializer(rest_serializers.ModelSerializer):

    resultLocation = rest_serializers.SerializerMethodField()

    class Meta:
        model = TaskModel
        fields = ('id', 'resultLocation')

    def get_resultLocation(self, obj):
        return reverse('model', obj.model, request=request)

但它不会承认在我的方法get_resultLocation中有任何东西被称为request。这个魔法应该如何工作

Answer 1

在同一份文件中，它还说：

The context dictionary can be used within any serializer field logic, such as a custom .to_representation() method, by accessing the self.context attribute.

所以我猜示例类可以更改为这样工作

class CompleteTaskModelSerializer(rest_serializers.ModelSerializer):

    resultLocation = rest_serializers.SerializerMethodField()

    class Meta:
        model = TaskModel
        fields = ('id', 'resultLocation')

    def get_resultLocation(self, obj):
        return reverse('model', obj.model, request=self.context['request'])