表结构
class Author(models.Model):
name = models.CharField(max_length=30)
email = models.EmailField()
class Book(models.Model):
title = models.CharField(max_length=200)
authors = models.ManyToManyField(Author, related_name='books')
通过Book查Author
b = Book.objects.get(id=1)
b.authors.all() # 查询id1的书籍作者
通过Author查Book
a = Author.objects.get(id=1)
a.book_set.all() # 查询作者id为1的所有书籍
a.books.all() # 通过自定义的related_name查
zheng