mirror of
https://github.com/django/django.git
synced 2024-12-24 18:16:19 +00:00
34 lines
810 B
Python
34 lines
810 B
Python
"""
|
|
5. Many-to-many relationships
|
|
|
|
To define a many-to-many relationship, use ``ManyToManyField()``.
|
|
|
|
In this example, an ``Article`` can be published in multiple ``Publication``
|
|
objects, and a ``Publication`` has multiple ``Article`` objects.
|
|
"""
|
|
|
|
from django.db import models
|
|
from django.utils.encoding import python_2_unicode_compatible
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Publication(models.Model):
|
|
title = models.CharField(max_length=30)
|
|
|
|
def __str__(self):
|
|
return self.title
|
|
|
|
class Meta:
|
|
ordering = ('title',)
|
|
|
|
@python_2_unicode_compatible
|
|
class Article(models.Model):
|
|
headline = models.CharField(max_length=100)
|
|
publications = models.ManyToManyField(Publication)
|
|
|
|
def __str__(self):
|
|
return self.headline
|
|
|
|
class Meta:
|
|
ordering = ('headline',)
|