如何通过一次 post，保存到 2 个表？

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这是一个创建于 2784 天前的主题，其中的信息可能已经有所发展或是发生改变。

目前我通过爬虫获取到了商品详情信息，想通过 post 提交保存到我的商品表，并且在保存数据的同时将其放入到购物车里，购物车里的商品信息是通过与商品表关联获取。应该怎么实现呢？

新手求指点。。

# 购物车模型 from django.db import models from goods.models import Goods class Cart(models.Model): cart_id = models.CharField(max_length=250, blank=True, verbose_name="购物车 id") add_time = models.DateField(auto_now_add=True, verbose_name="创建时间") class Meta: db_table = "Cart" ordering = ['add_time'] verbose_name ='购物车' verbose_name_plural = verbose_name def __str__(self): return self.cart_id class CartItem(models.Model): goods = models.ForeignKey(Goods, on_delete=models.CASCADE, verbose_name="商品名") cart = models.ForeignKey(Cart, on_delete=models.CASCADE, verbose_name="购物车 id") quantity = models.IntegerField(verbose_name="商品数量") active = models.BooleanField(default=True) class Meta: db_table = "CartItem" verbose_name = "购物车商品" verbose_name_plural = verbose_name def sub_total(self): return self.goods.good_price * self.quantity def __str__(self): return self.goods

# from 提交保存到商品表 def post(self, request): user = UserProfile.objects.get(username=request.user) new_goods = Goods(goods_user=user) goods_from = goodsForm(request.POST, instance=new_goods) if goods_from.is_valid(): goods_from.save() return redirect('cart:cart_detail') else: goods_from =goodsForm() return redirect('index')

# 添加到购物车 def add_cart(request, goods_id): goods = Goods.object.get(id=goods_id) try: cart = Cart.object.get(cart_id=_cart_id) except Cart.DoseNotExist: cart = Cart.object.create( cart_id = _cart_id(request) ) cart.save(), try: cart_item = CartItem.object.get(goods=goods, cart=cart) cart_item.quantity +=1 cart_item.save() except CartItem.DoseNotExist: cart_item = CartItem.object.create( goods = goods, quantity = 1, cart = cart ) cart_item.save() return redirect('cart:cart_detail')

第 1 条附言 2018-05-11 00:17:12 +08:00

@virusdefender

''' def post(self, request): user = UserProfile.objects.get(username=request.user) new_goods = Goods(goods_user=user) goods_from = DaikouForm(request.POST, instance=new_goods) if goods_from.is_valid(): goods_from.save() goods = Goods.object.get(id=new_goods.id) try: cart = Cart.object.get(cart_id=_cart_id) except Cart.DoseNotExist: cart = Cart.object.create( cart_id = _cart_id(request) ) cart.save(), try: cart_item = CartItem.object.get(goods=goods, cart=cart) cart_item.quantity += 1 cart_item.save() except CartItem.DoseNotExist: cart_item = CartItem.object.create( goods = goods, quantity = 1, cart = cart ) cart_item.save() return redirect('cart:cart_detail') else: goods_from =DaikouForm() return redirect('index') '''

第 2 条附言 2018-05-11 00:22:16 +08:00

 def post(self, request): user = UserProfile.objects.get(username=request.user) new_goods = Goods(goods_user=user) goods_from = DaikouForm(request.POST, instance=new_goods) if goods_from.is_valid(): goods_from.save() goods = Goods.object.get(id=new_goods.id) try: cart = Cart.object.get(cart_id=_cart_id) except Cart.DoseNotExist: cart = Cart.object.create( cart_id = _cart_id(request) ) cart.save(), try: cart_item = CartItem.object.get(goods=goods, cart=cart) cart_item.quantity += 1 cart_item.save() except CartItem.DoseNotExist: cart_item = CartItem.object.create( goods = goods, quantity = 1, cart = cart ) cart_item.save() return redirect('cart:cart_detail') else: goods_from =DaikouForm() return redirect('index')

13 条回复 2018-05-11 01:00:08 +08:00

Kilerd

2018-05-10 23:05:15 +08:00

抽象出 Service 层

myung

2018-05-10 23:07:24 +08:00

@Kilerd 能稍微具体些吗。。。我是新手

virusdefender

2018-05-11 00:02:18 +08:00

没懂你是什么问题，合并一下两个函数的代码不就可以了么

myung

2018-05-11 00:05:42 +08:00

@virusdefender。。我合并了但是没反应。。

myung

2018-05-11 00:08:51 +08:00

@virusdefender 合并 post 提交俩函数都不起作用了。。。

virusdefender

2018-05-11 00:10:15 +08:00

@myung #5 那就是你写错了，贴一下代码看看

myung

2018-05-11 00:11:10 +08:00

@virusdefender

'''
def post(self, request):
user = UserProfile.objects.get(username=request.user)
new_goods = Goods(goods_user=user)
goods_from = DaikouForm(request.POST, instance=new_goods)
if goods_from.is_valid():
goods_from.save()
goods = Goods.object.get(id=new_goods.id)
try:
cart = Cart.object.get(cart_id=_cart_id)
except Cart.DoseNotExist:
cart = Cart.object.create(
cart_id = _cart_id(request)
)
cart.save(),
try:
cart_item = CartItem.object.get(goods=goods, cart=cart)
cart_item.quantity += 1
cart_item.save()
except CartItem.DoseNotExist:
cart_item = CartItem.object.create(
goods = goods,
quantity = 1,
cart = cart
)
cart_item.save()
return redirect('cart:cart_detail')
else:
goods_from =DaikouForm()
return redirect('index')
'''

myung

2018-05-11 00:12:16 +08:00

@virusdefender 就是直接把添加到购物那个函数内容贴到保存数据库的后面了

myung

2018-05-11 00:21:38 +08:00

```
def post(self, request):
user = UserProfile.objects.get(username=request.user)
new_goods = Goods(goods_user=user)
goods_from = DaikouForm(request.POST, instance=new_goods)
if goods_from.is_valid():
goods_from.save()
goods = Goods.object.get(id=new_goods.id)
try:
cart = Cart.object.get(cart_id=_cart_id)
except Cart.DoseNotExist:
cart = Cart.object.create(
cart_id = _cart_id(request)
)
cart.save(),
try:
cart_item = CartItem.object.get(goods=goods, cart=cart)
cart_item.quantity += 1
cart_item.save()
except CartItem.DoseNotExist:
cart_item = CartItem.object.create(
goods = goods,
quantity = 1,
cart = cart
)
cart_item.save()
return redirect('cart:cart_detail')
else:
goods_from =DaikouForm()
return redirect('index')
```

myung

2018-05-11 00:23:18 +08:00

@virusdefender 贴到第 2 个附言了。。。贴错 3 次。

WordTian

2018-05-11 00:45:02 +08:00 via Android

python 不太熟，反正代码没看出问题，你发 post 的 url 接口是对应你改完的方法吗

myung

2018-05-11 00:50:59 +08:00

@WordTian 是的

myung

2018-05-11 01:00:08 +08:00

@WordTian 单独用都好用合并到一起就都不好使了