從Django的教程:Django的教程choice_set
from django.db import models
import datetime
from django.utils import timezone
# Create your models here.
class Poll(models.Model):
question = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')
def __unicode__(self): # Python 3: def __str__(self):
return self.question
def was_published_recently(self):
return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
def __unicode__(self): # Python 3: def __str__(self):
return self.choice_text
凡choice_set定義和如何工作的:
如下我定義我的模型?
>>> p = Poll.objects.get(pk=1)
# Display any choices from the related object set -- none so far.
>>> p.choice_set.all()
這是什麼叫python功能,它可以動態生成方法? –
它被稱爲元類編程,你可以在這裏閱讀它:http://www.onlamp.com/pub/a/python/2003/04/17/metaclasses.html - 在Django中,當你從'模型中繼承.Model'。 –