如何使用django-filebrowser在上传文件到文件夹之前重命名文件

like django's upload_to

django的upload_to

def upload_to(instance, filename):
    filename = time.strftime('%Y%m%d%H%M%S')
    ym = time.strftime('%Y%m')
    return 'uploads/%s/%s.jpg' % (ym,filename)

class Person(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)
    photo = models.ImageField(u"Image (Upload)",upload_to=upload_to)
de