/tests/regressiontests/modeladmin/models.py

# coding: utf-8
from datetime import date

from django.db import models
from django.contrib.auth.models import User

class Band(models.Model):
    name = models.CharField(max_length=100)
    bio = models.TextField()
    sign_date = models.DateField()

    class Meta:
        ordering = ('name',)

    def __unicode__(self):
        return self.name

class Concert(models.Model):
    main_band = models.ForeignKey(Band, related_name='main_concerts')
    opening_band = models.ForeignKey(Band, related_name='opening_concerts',
        blank=True)
    day = models.CharField(max_length=3, choices=((1, 'Fri'), (2, 'Sat')))
    transport = models.CharField(max_length=100, choices=(
        (1, 'Plane'),
        (2, 'Train'),
        (3, 'Bus')
    ), blank=True)

class ValidationTestModel(models.Model):
    name = models.CharField(max_length=100)
    slug = models.SlugField()
    users = models.ManyToManyField(User)
    state = models.CharField(max_length=2, choices=(("CO", "Colorado"), ("WA", "Washington")))
    is_active = models.BooleanField()
    pub_date = models.DateTimeField()
    band = models.ForeignKey(Band)

    def decade_published_in(self):
        return self.pub_date.strftime('%Y')[:3] + "0's"

class ValidationTestInlineModel(models.Model):
    parent = models.ForeignKey(ValidationTestModel)