django/tests/regressiontests/cache/models.py

from django.db import models
from datetime import datetime

def expensive_calculation():
    expensive_calculation.num_runs += 1
    return datetime.now()

class Poll(models.Model):
    question = models.CharField(max_length=200)
    answer = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published', default=expensive_calculation)
Fixed #12057 -- Corrected regression of caching performance when a model contained a callable default. Thanks to Michael Thornhill for the excellent assistance tracking this problem. git-svn-id: http://code.djangoproject.com/svn/django/trunk@11681 bcc190cf-cafb-0310-a4f2-bffc1f526a37 2009-10-29 14:32:01 +00:00			`from django.db import models`
			`from datetime import datetime`

			`def expensive_calculation():`
			`expensive_calculation.num_runs += 1`
			`return datetime.now()`

			`class Poll(models.Model):`
			`question = models.CharField(max_length=200)`
			`answer = models.CharField(max_length=200)`
			`pub_date = models.DateTimeField('date published', default=expensive_calculation)`