Django 依赖多对多

Django 是一个基于 Python 的开放源代码 Web 开发框架，它提供了一套高效、灵活和安全的工具，帮助开发者快速构建高质量的网站和 Web 应用程序。在 Django 中，依赖多对多是一种常见的数据库关系，它允许模型之间建立多对多的关联。本文将介绍 Django 中的依赖多对多关系，并通过一个案例代码来说明其用法。

python
from django.db import models
class Author(models.Model):
    name = models.CharField(max_length=100)
class Book(models.Model):
    title = models.CharField(max_length=100)
    authors = models.ManyToManyField(Author)

python
from django.db import models
class Author(models.Model):
    name = models.CharField(max_length=100)
    def __str__(self):
        return self.name
class Book(models.Model):
    title = models.CharField(max_length=100)
    authors = models.ManyToManyField(Author)
    def __str__(self):
        return self.title

python
author1 = Author.objects.create(name='John Smith')
author2 = Author.objects.create(name='Jane Doe')
book = Book.objects.create(title='Django for Beginners')
book.authors.add(author1, author2)

python
book = Book.objects.get(title='Django for Beginners')
authors = book.authors.all()
for author in authors:
    print(author)