1 from django.db import models

     2 

     3 class Author(models.Model):

     4     name = models.CharField(max_length=20)

     5 

     6     def __unicode__(self):

     7         return self.name

     8 

     9 class Book(models.Model):

    10     name = models.CharField(max_length=20)

    11     authors = models.ManyToManyField(Author)

    12 

    13     def __unicode__(self):

    14         return self.name