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"""
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
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class Reporter(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
def __str__(self):
return "%s %s" % (self.first_name, self.last_name)
@python_2_unicode_compatible
class Article(models.Model):
headline = models.CharField(max_length=100)
pub_date = models.DateField()
def __str__(self):
return self.headline
@python_2_unicode_compatible
class Writer(models.Model):
reporter = models.ForeignKey(Reporter, models.CASCADE)
article = models.ForeignKey(Article, models.CASCADE)
position = models.CharField(max_length=100)
def __str__(self):
return '%s (%s)' % (self.reporter, self.position)
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