轮播图实现和vue调试
urls viewset serializer (前端还需要相关配置 swiper-pagination 这个开源项目)
新品开发
和热卖商品一样，后台需要控制新品数量
首页商品分类显示功能
有多个一对多关系
context属性为嵌套的serializer传入request数据，在此主要功能为子serializer传入请求的ip网络地址。
class IndexCategorySerializer(serializers.ModelSerializer):
brands = BrandsSerializer(many=True)
goods = serializers.SerializerMethodField()
sub_cat = CategorySerializer2(many=True)
ad_goods = serializers.SerializerMethodField()
def get_ad_goods(self, obj):
goods_json = {}
ad_goods = IndexAd.objects.filter(category_id=obj.id)
if ad_goods:
goods_ins = ad_goods[0].goods
goods_json = GoodsSerializer(goods_ins, many=False,
context={"request": self.context["request"]}).data
return goods_json
def get_goods(self, obj):
all_goods = Goods.objects.filter(Q(category_id=obj.id) |
Q(category__parent_category_id=obj.id) |
Q(category__parent_category__parent_category_id=obj.id))
goods_serializer = GoodsSerializer(all_goods, many=True,
context={"request": self.context["request"]})
# context属性为嵌套的serializer传入request数据，在此主要功能为子serializer传入请求的ip网络地址。
return goods_serializer.data # modelmixin源码当中可查看这种样式的编码。返回serializer对象的data
class Meta:
model = GoodsCategory
fields = "__all__"
models中添加广告models
class IndexAd(models.Model):
category = models.ForeignKey(GoodsCategory, on_delete=models.CASCADE,
verbose_name='商品类目', related_name="category")
goods = models.ForeignKey(Goods, on_delete=models.CASCADE, verbose_name='商品', related_name='goods')
class Meta:
verbose_name = '首页广告'
verbose_name_plural = verbose_name
def __str__(self):
return self.goods.name
xadmin相关配置(mooc项目中)
django获取model中几个字段的数据
pk代表主键的意思
from attendence.models import Employee
from attendence.models import EmployeeIP
#获取一个字段
ipList = EmployeeIP.objects.values("IP").first()
print(type(ipList))
#
print(ipList)
# {'IP': '192.168.1.41'}
#获取多个字段
empList = Employee.objects.values("first_name", "last_name", "email")[0:2]
print(type(empList))
#
print(empList)
# [
# {'last_name': 'Wei', 'first_name': 'Vena', 'email': '[email protected]'},
# {'last_name': 'Wan', 'first_name': 'Mark', 'email': '[email protected]'}
# ]
商品点击数，收藏数修改
点击数
classlistviewset中重载retrieve方法
def retrieve(self, request, *args, **kwargs):
instance = self.get_object()
instance.click_num += 1
instance.save()
serializer = self.get_serializer(instance)
return Response(serializer.data)
收藏数 增加和减少
方法1：view中重写perform_create函数，删除类似
def perform_create(self, serializer):
instance = serializer.save()
goods = instance.goods
goods.fav_num += 1
goods.save()
方法二：signal信号量方式(django每次修改都会传递信号量函数)
apps中配置ready函数
def ready(self):
import user_operation.signals
signal文件中写函数
@receiver(post_save, sender=UserFav)
def create_user_fav(sender, instance=None, created=False, **kwargs): # 此处函数名不影响
if created:
goods = instance.goods
goods.fav_num += 1
goods.save()
@receiver(post_delete, sender=UserFav)
def delete_user_fav(sender, instance=None, created=False, **kwargs): # 此处函数名不影响
goods = instance.goods
goods.fav_num -= 1
goods.save()
商品库存和销量修改
库存修改
在viewset中重载perform方法
此处create方法存在错误，由于create方法对应有创建和添加，不应该在此处重载(应该在serializer中*或者传入信号量中？)。此处已经没有了传入的初始值，而是序列化之后的处理值。
以下在serializer的create重载函数中处理create时的goods数量变化。应该可以
class ShopCartSerializer(serializers.Serializer):
...
def create(self, validated_data):
...
goods.goods_num -= nums
goods.save()
return existed
create方法不可用
#def perform_create(self, serializer):
#shop_cart = serializer.save()
#goods = shop_cart.goods
#goods.goods_num -= shop_cart.nums
#goods.save()
def perform_destroy(self, instance):
goods = instance.goods
goods.goods_num += instance.nums
goods.save()
instance.delete()
def perform_update(self, serializer):
existed_record = ShoppingCart.objects.filter(id=serializer.instance.id)[0]
existed_nums = existed_record.nums
save_record = serializer.save()
nums = save_record.nums - existed_nums
goods = save_record.goods
goods.goods_num -= nums
goods.save()
销量修改
在alipay支付成功后的post处理view中增加以下代码，实际过程中应该是分离处理
# for existed_order in existed_orders: # 上接此处
# 交易成功销量增加
order_goods = existed_order.goods.all()
for order_good in order_goods:
goods = order_good.goods
goods.sold_num += order_good.goods_num
goods.save()