/tests/modeltests/m2o_recursive/models.py
Python | 28 lines | 24 code | 0 blank | 4 comment | 0 complexity | 96220b891ed29a24a3cd2bf793d6c777 MD5 | raw file
Possible License(s): BSD-3-Clause
1""" 211. Relating an object to itself, many-to-one 3 4To define a many-to-one relationship between a model and itself, use 5``ForeignKey('self')``. 6 7In this example, a ``Category`` is related to itself. That is, each 8``Category`` has a parent ``Category``. 9 10Set ``related_name`` to designate what the reverse relationship is called. 11""" 12 13from django.db import models 14 15class Category(models.Model): 16 name = models.CharField(max_length=20) 17 parent = models.ForeignKey('self', blank=True, null=True, related_name='child_set') 18 19 def __unicode__(self): 20 return self.name 21 22class Person(models.Model): 23 full_name = models.CharField(max_length=20) 24 mother = models.ForeignKey('self', null=True, related_name='mothers_child_set') 25 father = models.ForeignKey('self', null=True, related_name='fathers_child_set') 26 27 def __unicode__(self): 28 return self.full_name