更新

Python-100-Days/Day41-55/shop/cart/admin.py

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+from django.contrib import admin
+
+from cart.models import Goods
+
+
+class GoodsAdmin(admin.ModelAdmin):
+
+    list_display = ('id', 'name', 'price', 'image')
+    search_fields = ('name', )
+
+
+admin.site.register(Goods, GoodsAdmin)

Python-100-Days/Day41-55/shop/cart/apps.py

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+from django.apps import AppConfig
+
+
+class CartConfig(AppConfig):
+    name = 'cart'

Python-100-Days/Day41-55/shop/cart/migrations/0001_initial.py

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+# Generated by Django 2.0.5 on 2018-05-25 06:28
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Goods',
+            fields=[
+                ('id', models.AutoField(db_column='gid', primary_key=True, serialize=False)),
+                ('name', models.CharField(db_column='gname', max_length=50)),
+                ('price', models.DecimalField(db_column='gprice', decimal_places=2, max_digits=10)),
+                ('image', models.CharField(db_column='gimage', max_length=255)),
+            ],
+            options={
+                'db_table': 'tb_goods',
+                'ordering': ('id',),
+            },
+        ),
+    ]

Python-100-Days/Day41-55/shop/cart/models.py

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+from django.db import models
+
+
+class Goods(models.Model):
+    """商品模型类"""
+
+    id = models.AutoField(primary_key=True, db_column='gid')
+    name = models.CharField(max_length=50, db_column='gname')
+    price = models.DecimalField(max_digits=10, decimal_places=2, db_column='gprice')
+    image = models.CharField(max_length=255, db_column='gimage')
+
+    class Meta:
+
+        db_table = 'tb_goods'
+        ordering = ('id', )

Python-100-Days/Day41-55/shop/cart/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

Python-100-Days/Day41-55/shop/cart/views.py

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+from django.shortcuts import render, redirect
+
+from cart.models import Goods
+
+
+def index(request):
+    goods_list = list(Goods.objects.all())
+    return render(request, 'goods.html', {'goods_list': goods_list})
+
+
+class CartItem(object):
+    """购物车中的商品项"""
+
+    def __init__(self, goods, amount=1):
+        self.goods = goods
+        self.amount = amount
+
+    @property
+    def total(self):
+        return self.goods.price * self.amount
+
+
+class ShoppingCart(object):
+    """购物车"""
+
+    def __init__(self):
+        self.items = {}
+
+    def add_item(self, item):
+        if item.goods.id in self.items:
+            self.items[item.goods.id].amount += item.amount
+        else:
+            self.items[item.goods.id] = item
+
+    def remove_item(self, id):
+        if id in self.items:
+            self.items.remove(id)
+
+    def clear_all_items(self):
+        self.items.clear()
+
+    @property
+    def cart_items(self):
+        return self.items.values()
+
+    @property
+    def total(self):
+        val = 0
+        for item in self.items.values():
+            val += item.total
+        return val
+
+
+def add_to_cart(request, id):
+    goods = Goods.objects.get(pk=id)
+    # 通过request对象的session属性可以获取到session
+    # session相当于是服务器端用来保存用户数据的一个字典
+    # session利用了Cookie保存sessionid
+    # 通过sessionid就可以获取与某个用户对应的会话(也就是用户数据)
+    # 如果在浏览器中清除了Cookie那么也就清除了sessionid
+    # 再次访问服务器时服务器会重新分配新的sessionid这也就意味着之前的用户数据无法找回
+    # 默认情况下Django的session被设定为持久会话而非浏览器续存期会话
+    # 通过SESSION_EXPIRE_AT_BROWSER_CLOSE和SESSION_COOKIE_AGE参数可以修改默认设定
+    # Django中的session是进行了持久化处理的因此需要设定session的序列化方式
+    # 1.6版开始Django默认的session序列化器是JsonSerializer
+    # 可以通过SESSION_SERIALIZER来设定其他的序列化器(例如PickleSerializer)
+    cart = request.session.get('cart', ShoppingCart())
+    cart.add_item(CartItem(goods))
+    request.session['cart'] = cart
+    return redirect('/')
+
+
+def show_cart(request):
+    cart = request.session.get('cart', None)
+    return render(request, 'cart.html', {'cart': cart})