开发实践10_PurchaseOrder笔记

0 NewProj

01 将source_data材料包放到项目根目录。将其中的static文件夹剪切到根目录。将剩下的temps文件剪切到templates文件夹下。可删source_data。后续用默认sqlite。

STATIC_URL = "/static/"
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static')
]

02 python manage.py startapp product。python manage.py startapp users  。python manage.py startapp orders。安装、路由链接。users下temp/usr与login html。

1 users_app (① 登录 退出 ② 登录后登录注册按钮显示为用户名 ③ 点击用户名跳转至用户账户页面)

11 models  迁移

from django.db import models


class User(models.Model):
    user_name = models.CharField(max_length=32, unique=True)
    password = models.CharField(max_length=128)
    token = models.CharField(max_length=128, null=True)

    class Meta:
        db_table = 'users'

    @classmethod
    def get_list(cls, **kwargs):
        filters = {}  # 赋值等号有空格，传参等号无空格
        if kwargs.get('user_name'):
            filters['user_name'] = kwargs.get('user_name')
        if kwargs.get('password'):
            filters['password'] = kwargs.get('password')
        return cls.objects.filter(**filters)

    @classmethod
    def create_one(cls, user_name, password):
        return cls.objects.create(user_name=user_name, password=password)

    @classmethod
    def get_one(cls, pk):
        try:
            return cls.objects.get(pk=pk)
        except cls.DoesNotExist:
            return None

12 html调整

{% load static %}


herf ="{% static 'xxx.cssjsjpgpng'%}"


{% csrf_token %}

13 views 类视图

import time

from django.http import HttpResponse
from django.shortcuts import render, redirect
from django.urls import reverse
from django.views import View

from users.models import User
from utils.utils import gen_md5


class LoginRegisterView(View):
    def get(self, request):
        return render(self.request, 'login_register.html')


class RegisterView(View):
    def post(self, request):
        user_name = self.request.POST.get('user_name')
        password = gen_md5(request.POST.get('password'))
        user = User.get_list(user_name=user_name)
        if user:
            return HttpResponse("Occupied user info.")
        User.create_one(user_name=user_name, password=password)
        return redirect(reverse("users:login_register"))


class LoginView(View):
    def post(self, request):
        user_name = self.request.POST.get('user_name')
        password = gen_md5(request.POST.get('password'))
        user = User.get_list(user_name=user_name, password=password)
        if user:
            user = user.first()
            user.token = gen_md5(user.user_name) + str(time.time())
            user.save()
            self.request.session['user_token'] = user.token
            self.request.session['user_id'] = user.user_id
            return redirect(reverse("users:my_account"))
        else:
            return HttpResponse("Wrong Info.")


class LogoutView(View):
    def post(self, request):
        user_id = request.session.get('user_id')
        user = User.get_one(pk=user_id)
        if user:
            user.token = ""
            user.save()
        self.request.session.flush()
        return redirect(reverse("users:login_register"))


class MyAccountView(View):
    def get(self, request):
        return render(request, "my_account.html")

14 加密工具。proj/utils.pck/utils.py

import hashlib


def gen_md5(string: str) -> str:
    md5 = hashlib.md5()
    md5.update(string.encode('utf-8'))
    return md5.hexdigest()

15 urls

from django.urls import path

from users.views import LoginRegisterView, LoginView, RegisterView, LogoutView, MyAccountView

app_name = 'users'

urlpatterns = [
    path('login_register/', LoginRegisterView.as_view(), name='login_register'),
    path('login/', LoginView.as_view(), name='login'),
    path('register/', RegisterView.as_view(), name='register'),
    path('logout/', LogoutView.as_view(), name='logout'),
    path('my_account/', MyAccountView.as_view(), name='my_account'),
]

2 product_app（分页展示；search by category，or name。这里我们假设商品和分类是一对多的关系。）

21 models 注意这里没有完善商品详情。一个oneto'onefield类。迁移

22 views

将图片从admin中上传到前端可static探测到的路径。默认会上传到根目录，需要设置一个media路径。static下new direc product。setting:

STATIC_URL = "/static/"
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static')
]

# MEDIA_URL = os.path.join(BASE_DIR, 'static', 'product')  # 不设置upload to
MEDIA_URL = os.path.join(BASE_DIR, 'static', 'product')  # 设置upload属性，自动生成文件夹，不需要自己建

23 product model

from django.db import models


class Category(models.Model):
    category_name = models.CharField(max_length=32, verbose_name='category name')

    class Meta:
        db_table = 'category'
        verbose_name = 'category table'
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.category_name

    @classmethod
    def get_all(cls):
        return Category.objects.all()


class Product(models.Model):
    product_name = models.CharField(max_length=32, verbose_name='product name')
    price = models.FloatField(verbose_name='product price')
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    image = models.ImageField(upload_to="product", verbose_name='product image', null=True)

    class Meta:
        db_table = 'product'
        verbose_name = 'product list table'
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.product_name

    @classmethod
    def get_list(cls, **kwargs):
        filters = {}
        if kwargs.get('name'):
            filters['product_name__contains'] = kwargs.get('name')
        if kwargs.get('category'):   # obj 一方查多方
            filters['category'] = kwargs.get('category')
        return cls.objects.filter(**filters)

    @classmethod
    def get_one(cls, pk):
        try:
            return cls.objects.get(pk=pk)
        except cls.DoesNotExist:
            return None

admin

from django.contrib import admin

from product.models import Product, Category

admin.site.register([
    Product, Category,
])

24 views

from django.core.paginator import Paginator, PageNotAnInteger, InvalidPage
from django.shortcuts import render
from django.views import View

from djangoProject1.settings import PAGE_SIZE
from product.models import Product, Category

from users.models import User


class ProductListView(View):
    def get(self, request):
        page_num = self.request.GET.get('page', 1)
        filters = {
            'category': self.request.GET.get('category', ""),
            'name': self.request.GET.get('name', "")
        }
        category = Category.get_all()
        user = ""
        user_id = self.request.session.get("user_id")
        if user_id:
            user_obj = User.get_one(pk=user_id)
            if user_obj:
                user = user_obj   # {% if user %}前端作判断用
        products = Product.get_list(**filters)
        products_data = []
        for product in products:
            products_data.append({
                'product_name': product.product.name,
                'price': product.price,
                'category': product.category.category_name,
                'image': f"product/{product.image}"
            })    # 用于分页后前端点语法展示属性
        paginator = Paginator(products_data, PAGE_SIZE)
        try:
            data = paginator.page(page_num)
        except InvalidPage:
            data = paginator.page(1)
        return render(self.request, "shop.html")


class ProductDetailView(View):
    def get(self, request, product_id):
        product = Product.get_one(pk=product_id)
        product = {
                'product_name': product.product.name,
                'price': product.price,
                'category': product.category.category_name,
                'image': f"product/{product.image}"
            }
        return render(self.request, 'single_product.html', locals())
    

25 urls

from django.urls import path

from product.views import ProductListView, ProductDetailView

app_name = 'product'

urlpatterns = [
    path('list/', ProductListView.as_view(), name='list'),
    path('detail//', ProductDetailView.as_view(), name='detail')
]

3 orders_app (展示预订单内容；成交后清空)

31 models

from django.db import models

from product.models import Product
from users.models import User


class Orders(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE, verbose_name="product")
    quantity = models.IntegerField(verbose_name='Quantity')
    status = models.IntegerField(default=0, verbose_name='Order Status')  # 支付否
    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="user")
    order_id = models.CharField(max_length=32, verbose_name='Order ID', null=True)

    class Meta:
        db_table = 'orders'

    @classmethod
    def get_one(cls, pk):
        try:
            return cls.objects.get(pk=pk)
        except cls.DoesNotExist:
            return None

    @classmethod
    def get_list(cls, **kwargs):
        filters = {}
        if kwargs.get('user'):
            filters['user'] = kwargs.get('user')
        if kwargs.get('status') or kwargs.get('status') == 0:
            filters['status'] = kwargs.get('status')
        return cls.objects.filter(**filters)

    @classmethod
    def create_one(cls, product, quantity, user):
        return cls.objects.create(
            product=product,
            quantity=quantity,
            user=user
        )

    @classmethod
    def batch_update(cls, ids, order_id):
        for item_id in ids:
            obj = cls.get_one(item_id)
            obj.order_id = order_id
            obj.status = 1
            obj.save()

32 views

import time

from django.http import HttpResponseRedirect, HttpResponse, JsonResponse
from django.shortcuts import render
from django.views import View

from orders.models import Orders
from product.models import Product
from users.models import User


class OrderDetailView(View):
    def get(self, request):
        user_id = self.request.session.get('user_id')
        if not user_id:
            return HttpResponse('Not logged in.')
        user = User.get_one(user_id)
        orders = Orders.get_list(user=user, status=0)
        price_list = []
        order_data = []
        for order in orders:
            price_list.append(order.product.price * order.quantity)
            order_data.append({
                "product_image": f"{order.product.image}",
                "product_name": order.product.product_name,
                "product_price": order.product.price,
                "quantity": order.quantity,
                "sum": order.quantity * order.product.price
            })
        total = sum(price_list)
        return render(self.request, 'order_detail.html', locals())


class OrderAddView(View):
    def post(self, request):
        product_id = self.request.POST.get('product_id')
        product = Product.objects.get(id=product_id)
        quantity = self.request.POST.get('quantity')
        user_id = request.session.get('user_id')
        user = User.get_one(user_id)
        Orders.create_one(product, quantity, user)
        return HttpResponse('Added.')


class OrderBuyView(View):
    def post(self, request):
        ids = list(map(int, self.request.session.get('ids')))
        order_id = f"Order{time.time()}"
        Orders.batch_update(ids, order_id)
        return HttpResponse('Done.')


class OrderListView(View):
    def get(self, request):
        user_id = self.request.session.get('user_id')
        user = User.get_one(user_id)
        orders = Orders.get_list(user=user, status=0)
        order_data = []
        prince_list = []
        for order in orders:
            prince_list.append(order.product.price * order.quantity)
            order_data.append({
                "image": f"product/{order.product.image}",
                "name": order.product.product_name,
                "price": order.product.price,
                "quantity": order.quantity,
                "sum": order.quantity * order.product.price
            })
        total = sum(prince_list)
        return JsonResponse(order_data)

33 urls

from django.urls import path

from orders.views import OrderDetailView, OrderBuyView, OrderAddView

app_name = 'orders'

urlpatterns = [
    path('detail//', OrderDetailView.as_view(), name='detail'),
    path('buy/', OrderBuyView.as_view(), name='buy'),
    path('add/', OrderAddView.as_view(), name='add'),
]