1 """

     2 5. Many-to-many relationships

     3 

     4 To define a many-to-many relationship, use ``ManyToManyField()``.

     5 

     6 In this example, an ``Article`` can be published in multiple ``Publication``

     7 objects, and a ``Publication`` has multiple ``Article`` objects.

     8 """

     9 

    10 from django.db import models

    11 

    12 class Publication(models.Model):

    13     title = models.CharField(max_length=30)

    14 

    15     def __unicode__(self):

    16         return self.title

    17 

    18     class Meta:

    19         ordering = ('title',)

    20 

    21 class Article(models.Model):

    22     headline = models.CharField(max_length=100)

    23     publications = models.ManyToManyField(Publication)

    24 

    25     def __unicode__(self):

    26         return self.headline

    27 

    28     class Meta:

    29         ordering = ('headline',)