from __future__ import unicode_literals from django.db import models class Tag(models.Model): name = models.CharField(max_length=10) parent = models.ForeignKey('self', blank=True, null=True, related_name='children') class Meta: ordering = ['name'] def __unicode__(self): return self.name class Celebrity(models.Model): name = models.CharField("Name", max_length=20) greatest_fan = models.ForeignKey("Fan", null=True, unique=True) def __unicode__(self): return self.name class Fan(models.Model): fan_of = models.ForeignKey(Celebrity) class Staff(models.Model): id = models.IntegerField(primary_key=True) name = models.CharField(max_length=50) organisation = models.CharField(max_length=100) tags = models.ManyToManyField(Tag, through='StaffTag') coworkers = models.ManyToManyField('self') def __unicode__(self): return self.name class StaffTag(models.Model): staff = models.ForeignKey(Staff) tag = models.ForeignKey(Tag) def __unicode__(self): return "%s -> %s" % (self.tag, self.staff)