在Django的模型中添加自定义方法的示例

from django.contrib.localflavor.us.models import USStateField
from django.db import models

class Person(models.Model):
 first_name = models.CharField(max_length=50)
 last_name = models.CharField(max_length=50)
 birth_date = models.DateField()
 address = models.CharField(max_length=100)
 city = models.CharField(max_length=50)
 state = USStateField() # Yes, this is U.S.-centric...

 def baby_boomer_status(self):
 "Returns the person's baby-boomer status."
 import datetime
 if datetime.date(1945, 8, 1) <= self.birth_date <= datetime.date(19, 12, 31):
 return "Baby boomer"
 if self.birth_date < datetime.date(1945, 8, 1):
 return "Pre-boomer"
 return "Post-boomer"

 def is_midwestern(self):
 "Returns True if this person is from the Midwest."
 return self.state in ('IL', 'WI', 'MI', 'IN', 'OH', 'IA', 'MO')

 def _get_full_name(self):
 "Returns the person's full name."
 return u'%s %s' % (self.first_name, self.last_name)
 full_name = property(_get_full_name)

>>> p = Person.objects.get(first_name='Barack', last_name='Obama')
>>> p.birth_date
datetime.date(1961, 8, 4)
>>> p.baby_boomer_status()
'Baby boomer'
>>> p.is_midwestern()
True
>>> p.full_name # Note this isn't a method -- it's treated as an attribute
u'Barack Obama'