1 import datetime

     2 from django.db import models

     3 from django.utils.translation import ugettext_lazy as _

     4 

     5 def standalone_number(self):

     6     return 1

     7 

     8 class Numbers(object):

     9     @staticmethod

    10     def get_static_number(self):

    11         return 2

    12 

    13     @classmethod

    14     def get_class_number(self):

    15         return 3

    16 

    17     def get_member_number(self):

    18         return 4

    19 

    20 nn = Numbers()

    21 

    22 class Group(models.Model):

    23     name = models.CharField(_('name'), max_length=100)

    24 

    25 class Event(models.Model):

    26     group = models.ForeignKey(Group)

    27 

    28 class Happening(models.Model):

    29     when = models.DateTimeField(blank=True, default=datetime.datetime.now)

    30     name = models.CharField(blank=True, max_length=100, default=lambda:"test")

    31     number1 = models.IntegerField(blank=True, default=standalone_number)

    32     number2 = models.IntegerField(blank=True, default=Numbers.get_static_number)

    33     number3 = models.IntegerField(blank=True, default=Numbers.get_class_number)

    34     number4 = models.IntegerField(blank=True, default=nn.get_member_number)