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。

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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

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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

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<!DOCTYPE html>
{% load static %}
<html lang="zxx">

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

<form action="#">
{% csrf_token %}
<div class="login-form">

13 views 类视图

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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

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import hashlib


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

15 urls

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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:

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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

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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

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from django.contrib import admin

from product.models import Product, Category

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

24 views

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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

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from django.urls import path

from product.views import ProductListView, ProductDetailView

app_name = 'product'

urlpatterns = [
    path('list/', ProductListView.as_view(), name='list'),
    path('detail/<int:product_id>/', ProductDetailView.as_view(), name='detail')
]

3 orders_app (展示预订单内容；成交后清空)

31 models

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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

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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

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from django.urls import path

from orders.views import OrderDetailView, OrderBuyView, OrderAddView

app_name = 'orders'

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