如何在序列化器中设置默认值？

我有这些序列化器:

>---id = serializers.IntegerField()
>---name = serializers.CharField()
>---age = serializers.IntegerField()  

现在,我给序列化器这个数据:

{'id': 1, 'name': 'cc'}

我没有给出价值age.如何age在序列化器中设置默认值？

我想得到这个,这12是一个默认值:

{'id': 1, 'name': 'cc', 'age': 12}

小智.. 10

你想在序列化器中设置吗？

class PersonSerializer(serializers.ModelSerializer):
   age = serializers.SerializerMethodField()

   def get_age(self, obj):
       return getattr(obj, 'age', 12)

   class Meta:
       model = Person
       field = ('id', 'name', 'age')

Satyajeet.. 9

age = serializers.IntegerField(default=12, initial=12)

初始化为预填充html表单.查看文档

你想在序列化器中设置吗？

class PersonSerializer(serializers.ModelSerializer):
   age = serializers.SerializerMethodField()

   def get_age(self, obj):
       return getattr(obj, 'age', 12)

   class Meta:
       model = Person
       field = ('id', 'name', 'age')

age = serializers.IntegerField(default=12, initial=12)

初始化为预填充html表单.查看文档

如您所说，您没有模特

1.serializer.py

class UserSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    name = serializers.CharField()
    age = serializers.IntegerField(default=12) #if key age is missing, value of age become 12

    def validate(self,data):
        #other wise you can set default value of age here,
        if data.get('age',None)==None: #this conditon will be true only when age = serializer.IntergerField(required=False)
            data['age']=12
        return data

views.py

serializer = UserSerializer(data={'id': 1, 'name': 'cc', 'age': 14})
serializer.is_valid()
# True
serializer.validated_data
# {'id': 1, 'name': 'cc', 'age': 14} 

或者，如果您错过了在views.py中指定年龄的信息

serializer = UserSerializer(data={'id': 1, 'name': 'cc'})
serializer.is_valid()
# True
serializer.validated_data
# {'id': 1, 'name': 'cc', 'age': 12} 

希望这可以帮助某人:)