Django 轮播图模型设计

.app.models.py

from datetime import datetimeclass Banner(models.Model):    title = models.CharField(max_length=100,verbose_name=u"标题")    image = models.ImageField(upload_to="banner/%Y/%m",verbose_name=u"轮播图",max_length=100)    url = models.URLField(max_length=200,verbose_name=u"访问地址")    index = models.IntegerField(default=100,verbose_name=u"顺序")    add_time = models.DateTimeField(default=datetime.now,verbose_name=u"添加时间")    class Meta:        verbose_name = u"轮播图"        verbose_name_plural = verbose_name