更新了购物车案例的代码

Author: jackfrued

Day31-Day35/shop/cart/admin.py

@@ -6,6 +6,7 @@
 class GoodsAdmin(admin.ModelAdmin):
 
     list_display = ('id', 'name', 'price', 'image')
+    search_fields = ('name', )
 
 
 admin.site.register(Goods, GoodsAdmin)

Day31-Day35/shop/cart/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.0.5 on 2018-05-25 05:11
+# Generated by Django 2.0.5 on 2018-05-25 06:28
 
 from django.db import migrations, models
 

Day31-Day35/shop/cart/models.py

@@ -2,12 +2,14 @@
 
 
 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',)
+        ordering = ('id', )

Day31-Day35/shop/cart/views.py

@@ -1,4 +1,4 @@
-from django.shortcuts import render
+from django.shortcuts import render, redirect
 
 from cart.models import Goods
 
@@ -8,9 +8,68 @@ def index(request):
     return render(request, 'goods.html', {'goods_list': goods_list})
 
 
-def show_cart(request):
-    return render(request, 'cart.html')
+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 add_to_cart(request, no):
-    pass
+    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})

Day31-Day35/shop/manage.py

@@ -1,3 +1,3 @@
 import pymysql
 
-pymysql.install_as_MySQLdb()
+pymysql.install_as_MySQLdb()

Day31-Day35/shop/shop/__init__.py

@@ -20,7 +20,7 @@
 # See https://docs.djangoproject.com/en/2.0/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = '+gqc54!5+uhvc^o0)fjvihmg&5uu^u+#s5m*fc+e+@bw*(+!w*'
+SECRET_KEY = '3(n^av%_kt*^2zhz0!iwkxv6_wp^ed7-dpow*vqr7ck0_6=9^e'
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
@@ -37,7 +37,7 @@
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
-    'cart',
+    'cart.apps.CartConfig',
 ]
 
 MIDDLEWARE = [
@@ -78,7 +78,7 @@
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.mysql',
-        'NAME': 'Shop',
+        'NAME': 'shop',
         'HOST': 'localhost',
         'PORT': 3306,
         'USER': 'root',
@@ -105,11 +105,12 @@
     },
 ]
 
+SESSION_SERIALIZER = 'django.contrib.sessions.serializers.PickleSerializer'
 
 # Internationalization
 # https://docs.djangoproject.com/en/2.0/topics/i18n/
 
-LANGUAGE_CODE = 'en-us'
+LANGUAGE_CODE = 'zh-hans'
 
 TIME_ZONE = 'Asia/Chongqing'
 
@@ -122,5 +123,7 @@
 
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/2.0/howto/static-files/
-STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static')]
+
+STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static'),]
+
 STATIC_URL = '/static/'

Day31-Day35/shop/shop/settings.py

@@ -20,7 +20,7 @@
 
 urlpatterns = [
     path('', views.index),
+    path('add_to_cart/<int:id>', views.add_to_cart),
     path('show_cart', views.show_cart),
-    path('add_to_cart/<int:no>', views.add_to_cart),
     path('admin/', admin.site.urls),
 ]

Day31-Day35/shop/shop/urls.py

@@ -21,9 +21,9 @@ <h1>购物车列表</h1>
 			<hr>
 		</div>
 		<div class="right">
-			<a href="list_goods" class="back">返回</a>
+			<a href="/" class="back">返回</a>
 		</div>
-		{% if cart_items %}
+		{% if cart %}
 		<table style="clear: both;">
 			<tr>
 				<th>商品名称</th>
@@ -32,12 +32,12 @@ <h1>购物车列表</h1>
 				<th>商品总价</th>
 				<th>操作</th>
 			</tr>
-			{% for item in cart_items %}
+			{% for item in cart.cart_items %}
 			<tr>
-				<td class="name">{{ item.name }}</td>
-				<td class="price">&yen;{{ item.unit_price }}</td>
+				<td class="name">{{ item.goods.name }}</td>
+				<td class="price">&yen;{{ item.goods.price }}</td>
 				<td>{{ item.amount }}</td>
-				<td class="price">&yen;{{ item.total_price }}</td>
+				<td class="price">&yen;{{ item.total }}</td>
 				<td>
 					<a href="" class="del">删除</a>
 				</td>
@@ -47,7 +47,7 @@ <h1>购物车列表</h1>
 				<td colspan="5" class="total price">&yen;{{ cart.total }}元</td>
 			</tr>
 		</table>
-		<a href="clear_cart" class="back">清空购物车</a>
+		<a href="" class="back">清空购物车</a>
 		{% else %}
 		<h3 style="clear: both;">购物车中暂时没有商品!</h3>
 		{% endif %}

Day31-Day35/shop/static/images/Thumbs.db

@@ -0,0 +1,11 @@
+from django.contrib import admin
+
+from cart.models import Goods
+
+
+class GoodsAdmin(admin.ModelAdmin):
+
+    list_display = ('id', 'name', 'price', 'image')
+
+
+admin.site.register(Goods, GoodsAdmin)

Day31-Day35/shop/templates/cart.html

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class CartConfig(AppConfig):
+    name = 'cart'

Day31-Day35/shop_origin/cart/__init__.py

@@ -0,0 +1,27 @@
+# Generated by Django 2.0.5 on 2018-05-25 05:11
+
+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',),
+            },
+        ),
+    ]

Day31-Day35/shop_origin/cart/admin.py

@@ -0,0 +1,13 @@
+from django.db import models
+
+
+class Goods(models.Model):
+
+    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',)

Day31-Day35/shop_origin/cart/apps.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

Day31-Day35/shop_origin/cart/migrations/0001_initial.py

@@ -0,0 +1,16 @@
+from django.shortcuts import render
+
+from cart.models import Goods
+
+
+def index(request):
+    goods_list = list(Goods.objects.all())
+    return render(request, 'goods.html', {'goods_list': goods_list})
+
+
+def show_cart(request):
+    return render(request, 'cart.html')
+
+
+def add_to_cart(request, no):
+    pass

Day31-Day35/shop_origin/cart/migrations/__init__.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == "__main__":
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "shop.settings")
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)

Day31-Day35/shop_origin/cart/models.py

@@ -0,0 +1,3 @@
+import pymysql
+
+pymysql.install_as_MySQLdb()