mirror of
https://github.com/django/django.git
synced 2024-12-26 11:06:07 +00:00
4a103086d5
Thanks Vinay Sajip for the support of his django3 branch and Jannis Leidel for the review.
39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
"""
|
|
9. Many-to-many relationships via an intermediary table
|
|
|
|
For many-to-many relationships that need extra fields on the intermediary
|
|
table, use an intermediary model.
|
|
|
|
In this example, an ``Article`` can have multiple ``Reporter`` objects, and
|
|
each ``Article``-``Reporter`` combination (a ``Writer``) has a ``position``
|
|
field, which specifies the ``Reporter``'s position for the given article
|
|
(e.g. "Staff writer").
|
|
"""
|
|
from __future__ import unicode_literals
|
|
|
|
from django.db import models
|
|
|
|
|
|
class Reporter(models.Model):
|
|
first_name = models.CharField(max_length=30)
|
|
last_name = models.CharField(max_length=30)
|
|
|
|
def __unicode__(self):
|
|
return "%s %s" % (self.first_name, self.last_name)
|
|
|
|
class Article(models.Model):
|
|
headline = models.CharField(max_length=100)
|
|
pub_date = models.DateField()
|
|
|
|
def __unicode__(self):
|
|
return self.headline
|
|
|
|
class Writer(models.Model):
|
|
reporter = models.ForeignKey(Reporter)
|
|
article = models.ForeignKey(Article)
|
|
position = models.CharField(max_length=100)
|
|
|
|
def __unicode__(self):
|
|
return '%s (%s)' % (self.reporter, self.position)
|
|
|