更新了购物车案例的代码

Day31-Day35/shop/cart/admin.py

@@ -6,6 +6,7 @@ from cart.models import Goods
 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

-# 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

@@ -2,6 +2,7 @@ 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')
@@ -9,5 +10,6 @@ class Goods(models.Model):
     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

-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/shop/__init__.py

 import pymysql
 
-pymysql.install_as_MySQLdb()
\ No newline at end of file
+pymysql.install_as_MySQLdb()

Day31-Day35/shop/shop/settings.py

@@ -20,7 +20,7 @@ BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 # 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 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
-    'cart',
+    'cart.apps.CartConfig',
 ]
 
 MIDDLEWARE = [
@@ -78,7 +78,7 @@ WSGI_APPLICATION = 'shop.wsgi.application'
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.mysql',
-        'NAME': 'Shop',
+        'NAME': 'shop',
         'HOST': 'localhost',
         'PORT': 3306,
         'USER': 'root',
@@ -105,11 +105,12 @@ AUTH_PASSWORD_VALIDATORS = [
     },
 ]
 
+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 @@ USE_TZ = True
 
 # 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/urls.py

@@ -20,7 +20,7 @@ from cart import views
 
 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/templates/cart.html

@@ -21,9 +21,9 @@
 			<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 @@
 				<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 @@
 				<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_origin/cart/admin.py

+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_origin/cart/apps.py

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

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

+# 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/models.py

+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/tests.py

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

Day31-Day35/shop_origin/cart/views.py

+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/manage.py

+#!/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/shop/__init__.py

+import pymysql
+
+pymysql.install_as_MySQLdb()
\ No newline at end of file

Day31-Day35/shop_origin/shop/settings.py

+"""
+Django settings for shop project.
+
+Generated by 'django-admin startproject' using Django 2.0.5.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.0/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/2.0/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# 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*'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'cart',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'shop.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [os.path.join(BASE_DIR, 'templates')]
+        ,
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'shop.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/2.0/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.mysql',
+        'NAME': 'Shop',
+        'HOST': 'localhost',
+        'PORT': 3306,
+        'USER': 'root',
+        'PASSWORD': '123456',
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/2.0/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/2.0/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'Asia/Chongqing'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/2.0/howto/static-files/
+STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static')]
+STATIC_URL = '/static/'

Day31-Day35/shop_origin/shop/urls.py

+"""shop URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/2.0/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path
+
+from cart import views
+
+urlpatterns = [
+    path('', views.index),
+    path('show_cart', views.show_cart),
+    path('add_to_cart/<int:no>', views.add_to_cart),
+    path('admin/', admin.site.urls),
+]

Day31-Day35/shop_origin/shop/wsgi.py

+"""
+WSGI config for shop project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.0/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "shop.settings")
+
+application = get_wsgi_application()

Day31-Day35/shop/shop_create_sql.sql → Day31-Day35/shop_origin/shop_create_sql.sql

-drop database if exists Shop;
-create database Shop default charset utf8;
-use Shop;
-create table tb_goods
-(
-gid int not null auto_increment,
-gname varchar(50) not null,
-gprice decimal(10,2) not null,
-gimage varchar(255),
-primary key (gid)
-);
 insert into tb_goods values 
 (default, '乐事（Lay’s）无限薯片', 8.2, 'images/lay.jpg'),
 (default, '旺旺 仙贝 加量装 540g', 18.5, 'images/wang.jpg'),

Day31-Day35/shop_origin/templates/cart.html

+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<style>
+			th, td { margin: 0; padding: 0; width: 180px; text-align: left; }
+			.name { font-size: 14px; font-weight: bolder; width: 280px; }
+			.price { color: red; font-size: 18px; }
+			a { display: inline-block; text-align: center; background-color: red; }
+			.back { width: 120px; height: 30px; line-height: 30px; }
+			.del { width: 60px; height: 20px; line-height: 20px; }
+			a:link, a:visited { color: white; text-decoration: none; }
+			.left { float: left; width: 1000px;}
+			.right { float: right; }
+			.total { text-align: right; }
+		</style>
+	</head>
+	<body>
+		<div class="left">
+			<h1>购物车列表</h1>
+			<hr>
+		</div>
+		<div class="right">
+			<a href="list_goods" class="back">返回</a>
+		</div>
+		{% if cart_items %}
+		<table style="clear: both;">
+			<tr>
+				<th>商品名称</th>
+				<th>商品单价</th>
+				<th>商品数量</th>
+				<th>商品总价</th>
+				<th>操作</th>
+			</tr>
+			{% for item in cart_items %}
+			<tr>
+				<td class="name">{{ item.name }}</td>
+				<td class="price">&yen;{{ item.unit_price }}</td>
+				<td>{{ item.amount }}</td>
+				<td class="price">&yen;{{ item.total_price }}</td>
+				<td>
+					<a href="" class="del">删除</a>
+				</td>
+			</tr>
+			{% endfor %}
+			<tr>
+				<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>
+		{% else %}
+		<h3 style="clear: both;">购物车中暂时没有商品!</h3>
+		{% endif %}
+	</body>
+</html>
\ No newline at end of file

Day31-Day35/shop_origin/templates/goods.html

+<!DOCTYPE html>
+{% load staticfiles %}
+<html>
+	<head>
+		<meta charset="utf-8">
+		<style>
+			img { display: inline-block; width: 150px; height: 150px; border: 1px solid gray; }
+			th, td { margin: 0; padding: 0; width: 250px; text-align: left; }
+			.name { font-size: 14px; font-weight: bolder; }
+			.price { color: red; font-size: 18px; }
+			a { display: inline-block; width: 120px; height: 30px; line-height: 30px; text-align: center; background-color: red; }
+			a:link, a:visited { color: white; text-decoration: none; }
+			.left { float: left; width: 1000px;}
+			.right { float: right; }
+		</style>
+	</head>
+	<body>
+		<div class="left">
+			<h1>商品列表</h1>
+			<hr>
+		</div>
+		<div class="right">
+			<a href="/show_cart">查看购物车</a>
+		</div>
+		<table style="clear:both;">
+			<tr>
+				<th>商品名称</th>
+				<th>商品价格</th>
+				<th>商品图片</th>
+				<th>操作</th>
+			</tr>
+			{% for goods in goods_list %}
+			<tr>
+				<td class="name">{{ goods.name }}</td>
+				<td class="price">&yen;{{ goods.price }}</td>
+				<td>
+					<img src="{% static goods.image %}" alt="{{ goods.name }}">
+				</td>
+				<td>
+					<a href="/add_to_cart/{{ goods.id }}">加入购物车</a>
+				</td>
+			</tr>
+			{% endfor %}
+		</table>
+	</body>
+</html>
\ No newline at end of file