django rest framework serializer中获取request中user方法

views.py

 serializer = self.get_serializer(data=request.data, context={'request': request})
 serializer.is_valid(raise_exception=True)

serializers.py

 from_name = serializers.SerializerMethodField()  # 用户名
 def get_from_name(self, obj):

     return self.context['request'].user.name

 class Meta:
     model = Test
     fields = (
         'id',
         'from_name',)