django rest框架序列化程序到_表示

我有一个带有

SerializerMethodField

的

ModelSerializer

。我想重写序列化程序的

to_表示法

以获得自定义输出，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

参考：

---

因此我做了以下几点：

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

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