django-rest-framework serializer to_representation

Question

我有一个ModelSerializer与SerializerMethodField。我想重写串行的to_representation方法有自定义输出，但我不知道如何访问SerializerMethodField：

class MySerializer(serializers.ModelSerializer): 

    duration = serializers.SerializerMethodField() 

    def get_duration(self, obj): 
     return obj.time * 1000 

    def to_representation(self, instance): 
     return { 
      'name': instance.name, 
      'duration of cycle': # HOW TO ACCESS DURATION???? 
     } 


    class Meta: 
     model = MyModel 

Answer 1

def to_representation(self, instance): 
    duration = self.fields['duration'] 
    duration_value = duration.to_representation(
     duration.get_attribute(instance) 
    ) 
    return { 
     'name': instance.name, 
     'duration of cycle': duration_value 
    } 

裁判：

• https://github.com/tomchristie/django-rest-framework/blob/master/rest_framework/serializers.py#L417

Answer 2

所以我做了以下工作：

def to_representation(self, instance): 
     rep = super(MySerializer, self).to_representation(instance) 
     duration = rep.pop('duration', '') 
     return { 
      # the rest 
      'duration of cycle': duration, 
     }