# 缓存
CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1/5",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    }
}
#默认
# SESSION_CACHE_ALIAS = "default"

#首页 设置缓存
class Index(View):
    def get(self,request):
        #先获取缓存
        cache_data = cache.get('index_page_data')
        #如果 没有缓存
        if cache_data is None:
            #获取商品种类(所有对象)
            categorys = GoodsCategory.objects.all()

            #轮播信息 横幅
            banners = IndexGoodsBanner.objects.all()

            #活动 促销 信息
            promotions = IndexPromotionBanner.objects.all()

            # 商品列表 关联
            for category in categorys:
                titles = IndexCategoryGoodsBanner.objects.filter(category=category,display_type=0)
                category.display_titles = titles   #GoodsCategory类 category对象动态添加属性
                dispiay_images = IndexCategoryGoodsBanner.objects.filter(category=category,display_type=1)
                category.display_images = dispiay_images  #便于在 模板中调用
            
            #上下文
            context = {
                'categorys':categorys,'banners':banners,'promotions':promotions
            }
            # 设置缓存key、内容、有效时间
            cache.set('index_page_data',context,3600)
            #再次获取缓存
            cache_data = cache.get('index_page_data')return render(request,'index.html',cache_data)