"""

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 django.db import models

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)

class Article(models.Model):

    headline = models.CharField(max_length=100)

    pub_date = models.DateField()

class Writer(models.Model):

    reporter = models.ForeignKey(Reporter, models.CASCADE)

    article = models.ForeignKey(Article, models.CASCADE)

    position = models.CharField(max_length=100)