基于django的复杂图书二手交易系统代码实现

以下是一个基于Django的复杂图书二手交易系统的代码实现示例，包含了更多的功能和细节，仅供参考：

1. 数据库模型

from django.db import models
from django.contrib.auth.models import User

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=200)
    publisher = models.CharField(max_length=200)
    description = models.TextField()
    price = models.DecimalField(max_digits=6, decimal_places=2)
    image = models.ImageField(upload_to='book_covers/')
    owner = models.ForeignKey(User, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)

class Category(models.Model):
    name = models.CharField(max_length=200)

class BookCategory(models.Model):
    book = models.ForeignKey(Book, on_delete=models.CASCADE)
    category = models.ForeignKey(Category, on_delete=models.CASCADE)

class Order(models.Model):
    book = models.ForeignKey(Book, on_delete=models.CASCADE)
    buyer = models.ForeignKey(User, on_delete=models.CASCADE)
    quantity = models.IntegerField()
    total_price = models.DecimalField(max_digits=6, decimal_places=2)
    address = models.CharField(max_length=200)
    payment_method = models.CharField(max_length=200)
    status = models.CharField(max_length=200, default='Pending')
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

2. 表单

from django import forms
from .models import Book, Order

class BookForm(forms.ModelForm):
    class Meta:
        model = Book
        fields = ('title', 'author', 'publisher', 'description', 'price', 'image')

class OrderForm(forms.ModelForm):
    class Meta:
        model = Order
        fields = ('quantity', 'address', 'payment_method')

3. 视图函数

from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.db.models import Q
from .models import Book, Order, Category, BookCategory
from .forms import BookForm, OrderForm

@login_required
def sell_book(request):
    if request.method == 'POST':
        form = BookForm(request.POST, request.FILES)
        if form.is_valid():
            book = form.save(commit=False)
            book.owner = request.user
            book.save()
            categories = request.POST.getlist('categories')
            for category_id in categories:
                category = Category.objects.get(pk=category_id)
                BookCategory.objects.create(book=book, category=category)
            return redirect('book_detail', book_id=book.id)
    else:
        form = BookForm()
    categories = Category.objects.all()
    return render(request, 'sell_book.html', {'form': form, 'categories': categories})

def book_list(request):
    query = request.GET.get('q')
    if query:
        books = Book.objects.filter(Q(title__icontains=query) | Q(author__icontains=query))
    else:
        books = Book.objects.all()
    categories = Category.objects.all()
    return render(request, 'book_list.html', {'books': books, 'categories': categories})

def book_detail(request, book_id):
    book = get_object_or_404(Book, pk=book_id)
    categories = book.bookcategory_set.all().values_list('category', flat=True)
    related_books = Book.objects.filter(bookcategory__category__in=categories).exclude(pk=book_id)[:3]
    return render(request, 'book_detail.html', {'book': book, 'related_books': related_books})

@login_required
def add_to_cart(request, book_id):
    book = get_object_or_404(Book, pk=book_id)
    if request.method == 'POST':
        form = OrderForm(request.POST)
        if form.is_valid():
            order = form.save(commit=False)
            order.book = book
            order.buyer = request.user
            order.total_price = order.quantity * book.price
            order.save()
            return redirect('cart')
    else:
        form = OrderForm()
    return render(request, 'add_to_cart.html', {'book': book, 'form': form})

@login_required
def cart(request):
    orders = Order.objects.filter(buyer=request.user)
    return render(request, 'cart.html', {'orders': orders})

@login_required
def checkout(request):
    orders = Order.objects.filter(buyer=request.user, status='Pending')
    total_price = sum(order.total_price for order in orders)
    if request.method == 'POST':
        for order in orders:
            order.address = request.POST.get('address')
            order.payment_method = request.POST.get('payment_method')
            order.status = 'Paid'
            order.save()
        return redirect('order_history')
    return render(request, 'checkout.html', {'orders': orders, 'total_price': total_price})

@login_required
def order_history(request):
    orders = Order.objects.filter(buyer=request.user).order_by('-created_at')
    return render(request, 'order_history.html', {'orders': orders})

@login_required
def sell_history(request):
    books = Book.objects.filter(owner=request.user)
    orders = Order.objects.filter(book__in=books).order_by('-created_at')
    return render(request, 'sell_history.html', {'orders': orders})

4. URL配置

from django.urls import path
from . import views

urlpatterns = [
    path('sell_book/', views.sell_book, name='sell_book'),
    path('book_list/', views.book_list, name='book_list'),
    path('book_detail/<int:book_id>/', views.book_detail, name='book_detail'),
    path('add_to_cart/<int:book_id>/', views.add_to_cart, name='add_to_cart'),
    path('cart/', views.cart, name='cart'),
    path('checkout/', views.checkout, name='checkout'),
    path('order_history/', views.order_history, name='order_history'),
    path('sell_history/', views.sell_history, name='sell_history'),
]

5. 模板

sell_book.html

{% extends 'base.html' %}

{% block content %}
  <h2>Sell a Book</h2>
  <form method="post" enctype="multipart/form-data">
    {% csrf_token %}
    {{ form.as_p }}
    <p>Categories:</p>
    {% for category in categories %}
      <label>
        <input type="checkbox" name="categories" value="{{ category.id }}"> {{ category.name }}
      </label>
    {% endfor %}
    <button type="submit">Submit</button>
  </form>
{% endblock %}

book_list.html

{% extends 'base.html' %}

{% block content %}
  <h2>Book List</h2>
  <form method="get">
    <input type="text" name="q" placeholder="Search...">
    <button type="submit">Search</button>
  </form>
  <p>Categories:</p>
  <ul>
    <li><a href="{% url 'book_list' %}">All</a></li>
    {% for category in categories %}
      <li>
        <a href="{% url 'book_list' %}?category={{ category.id }}">{{ category.name }}</a>
      </li>
    {% endfor %}
  </ul>
  <ul>
    {% for book in books %}
      <li>
        <a href="{% url 'book_detail' book.id %}">
          {{ book.title }} by {{ book.author }}
        </a>
        - {{ book.price }}
        <a href="{% url 'add_to_cart' book.id %}">Add to Cart</a>
      </li>
    {% endfor %}
  </ul>
{% endblock %}

book_detail.html

{% extends 'base.html' %}

{% block content %}
  <h2>{{ book.title }} by {{ book.author }}</h2>
  <img src="{{ book.image.url }}" alt="{{ book.title }}">
  <p>{{ book.description }}</p>
  <p>Price: {{ book.price }}</p>
  <p>Categories:</p>
  <ul>
    {% for category in book.bookcategory_set.all %}
      <li>{{ category.category.name }}</li>
    {% endfor %}
  </ul>
  <a href="{% url 'add_to_cart' book.id %}">Add to Cart</a>
  <h3>Related Books</h3>
  <ul>
    {% for related_book in related_books %}
      <li>
        <a href="{% url 'book_detail' related_book.id %}">
          {{ related_book.title }} by {{ related_book.author }}
        </a>
      </li>
    {% endfor %}
  </ul>
{% endblock %}

add_to_cart.html

{% extends 'base.html' %}

{% block content %}
  <h2>Add to Cart - {{ book.title }}</h2>
  <form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Submit</button>
  </form>
{% endblock %}

cart.html

{% extends 'base.html' %}

{% block content %}
  <h2>Cart</h2>
  <ul>
    {% for order in orders %}
      <li>
        {{ order.book.title }} x {{ order.quantity }} - {{ order.total_price }}
      </li>
    {% endfor %}
  </ul>
  <a href="{% url 'checkout' %}">Checkout</a>
{% endblock %}

checkout.html

{% extends 'base.html' %}

{% block content %}
  <h2>Checkout</h2>
  <ul>
    {% for order in orders %}
      <li>
        {{ order.book.title }} x {{ order.quantity }} - {{ order.total_price }}
      </li>
    {% endfor %}
  </ul>
  <p>Total Price: {{ total_price }}</p>
  <form method="post">
    {% csrf_token %}
    <label>
      Address:
      <textarea name="address" required></textarea>
    </label>
    <label>
      Payment Method:
      <select name="payment_method" required>