django 购物系统 - 创建模型

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1. 前置准备

ER图 - 实体关系模型设计

UML类图 - 类的设计

2.Category模型

3.Product模型

4 django常用字段类型

BooleanField

CharField

TextField

DateField

DateTimeField

DecimalField

FileField

FilePathField

FloatField

ImageField 需要安装Pillow

IntegerField

SlugField

安装Pillow

sudo apt-get install libjpeg-dev

pip install --no-cache-dir -I Pillow

生成requirements.txt 用于安装依赖

cd /home/vagrant/shopsys

pyenv activate shopsysenv

pip freeze > requirements.txt

例子

from django.db import modelsfrom django.core.urlresolvers import reverse# Create your models here.class Category(models.Model):    name = models.CharField("名称", max_length=50)    slug = models.SlugField(        "Slug",        max_length=50,        unique=True,        help_text='根据name生成的, 用于生成页面URL,必须唯一'    )    description = models.TextField("描述")    is_active = models.BooleanField("是否激活", default=True)    meta_keywords = models.CharField(        "Meta 关键词",        max_length=255,        help_text="meta关键词, 有利于SEO, 用逗号分隔"    )    meta_description = models.CharField(        "Meta描述", max_length=255,        help_text="Meta描述"    )    created_at = models.DateTimeField("创建时间", auto_now_add=True)    updated_at = models.DateTimeField("更新时间", auto_now=True)    class Meta:        db_table = 'categories'        ordering = ['-created_at']        verbose_name_plural = 'Categories'    def __str__(self):        return self.name    def get_absolute_url(self):        return reverse('catalog_category', args=(self.slug,))class Product(models.Model):    name = models.CharField("名称", max_length=255, unique=True)    slug = models.SlugField(        "Slug",        max_length=255, unique=True,        help_text='根据name生成的, 用于生成页面URL,必须唯一',    )    brand = models.CharField("品牌", max_length=50)    sku = models.CharField("计量单位", max_length=50)    price = models.DecimalField("价格", max_digits=9, decimal_places=2)    old_price = models.DecimalField("旧价格", max_digits=9, decimal_places=2, blank=True, default=0.00)    image = models.ImageField("图片", max_length=50)    is_active = models.BooleanField("设为激活", default=True)    is_bestseller = models.BooleanField("设为畅销", default=False)    is_featured = models.BooleanField("设为推荐", default=False)    quantity = models.IntegerField("数量")    meta_keywords = models.CharField("Meta关键词",                                     max_length=255,                                     help_text='meta 关键词标签 逗号分隔')    meta_description = models.CharField("Meta描述",                                        max_length=255,                                        help_text='Meta描述标签')    created_at = models.DateTimeField("创建时间", auto_now_add=True)    updated_at = models.DateTimeField("更新时间", auto_now=True)    categories = models.ManyToManyField(Category)    class Meta:        db_table = 'products'        ordering = ['-created_at']    def __str__(self):        return self.name    def get_absolute_url(self):        return reverse('catalog_product', args=(self.slug,))    def sale_price(self):        if self.old_price > self.price:            return self.price        else:            return None

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