DRF总结（五）Django Rest FrameWork中一些自带的功能的使用

使用token和session

https://blog.youkuaiyun.com/weixin_42142216/article/details/91345957

使用信号量

栗子1：加密保存密码

• singals.py

post_save 该信号在保存到数据库之前触发

from django.db.models.signals import post_save
from django.dispatch import receiver
from rest_framework.authtoken.models import Token
from django.contrib.auth import get_user_model

User = get_user_model()
# sender就是一个要操作的Model
@receiver(post_save, sender=User)
def create_user(sender, instance=None, created=False, **kwargs):
    # 判断这个操作是不是新建
    if created:
        password = instance.password
        instance.set_password(password)
        instance.save()

这里的instance就是将要保存的User对象，由于User继承了abstractUser，所有可以使用set_password用来加密密码

栗子2：使用信号量完成增减收藏数量的操作

post_delete 在每次执行删除操作之前触发

from django.db.models.signals import post_delete, post_save
from django.dispatch import receiver

from user_operation.models import UserFav


@receiver(post_save, sender=UserFav)
def create_userfav(sender, instance=None, created=False, **kwargs):
    if created:
        goods = instance.goods
        goods.fav_num += 1
        goods.save()


@receiver(post_delete, sender=UserFav)
def delete_userfav(sender, instance=None, created=False, **kwargs):
    goods = instance.goods
    goods.fav_num -= 1
    goods.save()

class UserOperationConfig(AppConfig):
    name = 'user_operation'

    def ready(self):
        import user_operation.signals

• apps.py注册

from django.apps import AppConfig

class ConsumersConfig(AppConfig):
    name = 'consumers'

    def ready(self):
        import users.signals

获取用户模块

from django.contrib.auth import get_user_model
User = get_user_model()

使用DRF提供的缓冲拓展

GoodsListViewSet中继承CacheResponseMixin

from rest_framework_extensions.cache.mixins import CacheResponseMixin


class GoodsListViewSet(CacheResponseMixin,mixins.ListModelMixin,mixins.RetrieveModelMixin,viewsets.GenericViewSet):
    '''

注意，一定要放在第一个位置

配置缓存过期时间

#缓存配置
REST_FRAMEWORK_EXTENSIONS = {
    'DEFAULT_CACHE_RESPONSE_TIMEOUT': 10   #5s过期，时间自己可以随便设定
}