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from __future__ import unicode_literals
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class Tag(models.Model):
name = models.CharField(max_length=10)
parent = models.ForeignKey(
'self',
models.SET_NULL,
blank=True,
null=True,
related_name='children',
)
class Meta:
ordering = ['name']
def __str__(self):
return self.name
@python_2_unicode_compatible
class Celebrity(models.Model):
name = models.CharField("Name", max_length=20)
greatest_fan = models.ForeignKey(
"Fan",
models.SET_NULL,
null=True,
unique=True,
)
def __str__(self):
return self.name
class Fan(models.Model):
fan_of = models.ForeignKey(Celebrity, models.CASCADE)
@python_2_unicode_compatible
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 __str__(self):
return self.name
@python_2_unicode_compatible
class StaffTag(models.Model):
staff = models.ForeignKey(Staff, models.CASCADE)
tag = models.ForeignKey(Tag, models.CASCADE)
def __str__(self):
return "%s -> %s" % (self.tag, self.staff)
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