Django rest_framework serializer.HiddenField(default=serializer.CurrentUser())
在用Dajngo RestFramework时， 有时候需要这么一个场景，前端不需要传一个或多个字段，这些字是直接根据用户登录信息判断自动赋值的，如果用mixin和viewset进行搭配写接口，要么重写create, update等方法，要么就是在serializer_class时就定义默认值，而第二种方法明显简单一些。
具体看代码
# 假如我定义了一个serliazer，shop和status都是自动判断后赋值的
# 用HiddenField定义字段，default方法来写具体赋值函数
# default方法是一个类，需要重写set_context的方法
from rest_framework.compat import (
InvalidTimeError, MaxLengthValidator, MaxValueValidator,
MinLengthValidator, MinValueValidator, unicode_repr, unicode_to_repr
)
class CurrentShopDefault(object):
def set_context(self, serializer_field):
self.shop = serializer_field.context['request'].user.shop
def __call__(self):
return self.shop
def __repr__(self):
return unicode_to_repr('%s()' % self.__class__.__name__)
class CurrentStatus(object):
def set_context(self, serializer_field):
user_info = serializer_field.context['request'].user
if user_info.shop.shop_type == 'SHOP_TYPE_COMCIRCLE':
self.status = 1
else:
self.status = 2
def __call__(self):
return self.status
def __repr__(self):
return unicode_to_repr('%s()' % self.__class__.__name__)
# 定义serializer
class GameSerializer(serializers.ModelSerializer):
class Meta:
model = Game
exclude = ['created_time']
shop = serializers.HiddenField(
default=CurrentShopDefault()
)
status = serializers.HiddenField(
default=CurrentStatus()
)
最后在view文件的class里直接指定serializer_class就好了
class GameOpView(mixins.CreateModelMixin, mixins.UpdateModelMixin, mixins.RetrieveModelMixin, mixins.DestroyModelMixin, viewsets.GenericViewSet): """ retrieve: 获取-游戏详情 create: 创建-游戏 update: 更新-游戏 delete: 删除-游戏 partial_update: 更新游戏状态 total_info: 游戏数据总览 """ permission_classes = [IsShop, ] pagination_class = StandardResultsSetPagination def get_queryset(self): return Game.objects.filter( Q(shop=self.request.user.shop) | Q(shop__com_circle=self.request.user.shop)) def get_serializer_class(self): if self.action == 'partial_update': return GameStatusSerializer elif self.action == 'retrieve': return GameReadSerializer else: return GameSerializer
补充知识：drf 中serializers.HiddenField使用方法
class CurrentUser(object):
def set_context(self, serializer_field):
self.user_obj = serializer_field.context['request'].user
def __call__(self):
return self.user_obj
class GetObjectFlow(object):
def set_context(self, serializer_field):
self.object_flow = serializer_field.context['request'].data.get('object_flow') # 这里需要在views中传进去呀，djangocontext上下文中才能取到
def __call__(self):
return self.object_flow
class AddHolidaySerializer(serializers.ModelSerializer, BaseModelSerializer):
user = serializers.HiddenField(default=CurrentUser()) # 给用户外键赋当前请求的user
object_flow = serializers.HiddenField(default=GetObjectFlow()) # 后端自己处理一些特殊的外键
status = serializers.HiddenField(default=0) # 默认新增时给status赋初值
class Meta:
model = Holiday
exclude = ('deleted',)
以上这篇Django Serializer HiddenField隐藏字段实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
