将请求上下文从Django Rest Framework中的Viewset传递给序列化程序 [英] Pass request context to serializer from Viewset in Django Rest Framework

问题描述

我有一个这样的情况，一个序列化器字段的值取决于当前登录的用户的身份。我已经看到如何在初始化序列化程序时将用户添加到上下文中，但是当使用ViewSet时，我不知道如何执行此操作，因为您只提供序列化器类而不是实际的串行器实例。

基本上我想知道如何从：

  class myModelViewSet（ModelViewSet）： 
 queryset = myModel.objects.all（）
 permission_classes = [DjangoModelPermissions] 
 serializer_class = myModelSerializer 
  

to：

  class myModelSerializer（serializers.ModelSerializer）：
 uploaded_by = serializers。 SerializerMethodField（）
 special_field = serializers.SerializerMethodField（）
 
 class Meta：
 model = myModel 
 
 def get_special_field（self，obj）：
 if self.context ['request']。user.has_perm（'something.add_something'）：
 return something 
  

对不起，如果没有从DOC中清除：
添加额外上下文
哪个说要做

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

但我不知道如何从视图自动执行，因为我只能改变serializer类，而不是Serializer实例本身。

解决方案

GenericViewSet 具有可以覆盖的 get_serializer_context 方法：

 类myModelViewSet（ModelViewSet）：
 queryset = myModel.objects.all（）
 permission_classes = [DjangoModelPermissions] 
 serializer_class = myModelSerializer 
 
 def get_serializer_context（self）：
 return {'request'：self.request} 
  

I have a case where the values for a serializer field depend on the identity of the currently logged in user. I have seen how to add the user to the context when initializing a serializer, but I am not sure how to do this when using a ViewSet, as you only supply the serializer class and not the actual serializer instance.

Basically I would like to know how to go from:

class myModelViewSet(ModelViewSet):
   queryset = myModel.objects.all()
   permission_classes = [DjangoModelPermissions]
   serializer_class = myModelSerializer

to:

class myModelSerializer(serializers.ModelSerializer):
    uploaded_by = serializers.SerializerMethodField()
    special_field = serializers.SerializerMethodField()

    class Meta:
        model = myModel

    def get_special_field(self, obj):
        if self.context['request'].user.has_perm('something.add_something'):
           return something

Sorry if it wasn't clear, from the DOCs: Adding Extra Context Which says to do

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

But I am not sure how to do that automatically from the viewset, as I only can change the serializer class, and not the serializer instance itself.

解决方案

GenericViewSet has the get_serializer_context method you can override:

class myModelViewSet(ModelViewSet):
    queryset = myModel.objects.all()
    permission_classes = [DjangoModelPermissions]
    serializer_class = myModelSerializer

    def get_serializer_context(self):
        return {'request': self.request}

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