在Django的模型中添加自定义方法的示例

from django.contrib.localflavor.us.models import USStateFieldfrom django.db import modelsclass 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(1964, 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_datedatetime.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 attributeu'Barack Obama'