一 模型類的設(shè)計(jì)

• 設(shè)計(jì)兩個數(shù)據(jù)類一個訂單信息表，一個訂單詳情表

  model.py
    from django.db import models
  
    # Create your models here.
    class OrderInfo(models.Model):
        oid = models.CharField(max_length=20,primary_key=True)
        user = models.ForeignKey('df_user.UserInfo')
        odate = models.DateTimeField(auto_now=True)
        oIsPay = models.IntegerField(default=0)
        ototal = models.DecimalField(max_digits=6,decimal_places=2)
        oaddress = models.CharField(max_length=150,default='')
        zhifu = models.IntegerField(default=0)
  
    class OrderDetailInfo(models.Model):
        goods=models.ForeignKey('df_goods.GoodsInfo')
        order=models.ForeignKey(OrderInfo)
        price=models.DecimalField(max_digits=5,decimal_places=2)
        count=models.IntegerField()
  

二 views功能的設(shè)計(jì)

• views中定義了order和order_handle兩個函數(shù)

  views.py
   from django.shortcuts import render
  
   # Create your views here.
   from django.shortcuts import render,redirect
   from django.db import transaction
   from datetime import datetime
   from decimal import Decimal
  
   from df_cart.models import CartInfo
   from .models import OrderInfo,OrderDetailInfo
   from df_user.islogin import islogin
  
   from df_goods.models import GoodsInfo
   from df_user.models import UserInfo
   from django.http import JsonResponse
  
  
   # Create your views here.
   @islogin
   def order(request):
       """
       此函數(shù)用戶給下訂單頁面展示數(shù)據(jù)
       接收購物車頁面GET方法發(fā)過來的購物車中物品的id，構(gòu)造購物車對象供訂單使用
       """
  
       uid = request.session.get('user_id')
       user = UserInfo.objects.get(id=uid)
  
       # 獲取勾選的每一個訂單對象，構(gòu)造成list，作為上下文傳入下單頁面
       orderid = request.GET.getlist('orderid')
       orderlist = []
  
       for id in orderid:
           orderlist.append(CartInfo.objects.get(id=int(id)))
  
       # 判斷用戶手機(jī)號是否為空，分別做展示
       if user.uphone == '':
           uphone = ''
       else:
           uphone = user.uphone[0:4] + \
               '****' + user.uphone[-4:]
  
       # 構(gòu)造上下文
       context = {'title': '提交訂單', 'page_name': 1, 'orderlist': orderlist,
                  'user': user, 'ureceive_phone': uphone}
  
       return render(request, 'df_order/place_order.html', context)
  
  
   #--------------------------------------------什么裝飾器？->事務(wù)   一旦有一步操作失敗，則回滾全部操作
   @transaction.atomic()
   @islogin
   def order_handle(request):
       #保存一個事物點(diǎn)
       tran_id = transaction.savepoint()
       #接收購物車編號
       # 根據(jù)POST和session獲取信息
       # cart_ids=post.get('cart_ids')
       try:
           post = request.POST
           orderlist = post.getlist('id[]')
           total = post.get('total')
           address = post.get('address')
  
           order=OrderInfo()
           now=datetime.now()
           uid = request.session.get('user_id')
           order.oid='%s%d'%(now.strftime('%Y%m%d%H%M%S'),uid)
           order.user_id=uid
           order.odate=now
           order.ototal=Decimal(total)
           order.oaddress = address
           order.save()
  
           # 遍歷購物車中提交信息，創(chuàng)建訂單詳情表
           for orderid in orderlist:
               cartinfo = CartInfo.objects.get(id=orderid)
               # good = GoodsInfo.objects.get(cartinfo__id=cartinfo.id)
               good = GoodsInfo.objects.get(pk=cartinfo.goods_id)
               # print '*'*10
               # print cartinfo.goods_id
               # 判斷庫存是否夠
               if int(good.gkucun) >= int(cartinfo.count):
                   # 庫存夠，移除購買數(shù)量并保存
                   good.gkucun -= int(cartinfo.count)
                   good.save()
  
                   goodinfo = GoodsInfo.objects.get(cartinfo__id=orderid)
  
                   # 創(chuàng)建訂單詳情表
                   detailinfo = OrderDetailInfo()
                   detailinfo.goods_id = int(goodinfo.id)
                   detailinfo.order_id = int(order.oid)
                   detailinfo.price = Decimal(int(goodinfo.gprice))
                   detailinfo.count = int(cartinfo.count)
                   detailinfo.save()
  
                   # 循環(huán)刪除購物車對象
                   cartinfo.delete()
               else:
                   # 庫存不夠出發(fā)事務(wù)回滾
                   transaction.savepoint_rollback(tran_id)
                   # 返回json供前臺提示失敗
                   return JsonResponse({'status': 2})
       except Exception as e:
               print ('==================%s'%e)
               transaction.savepoint_rollback(tran_id)
           # 返回json供前臺提示成功
       return JsonResponse({'status': 1})