from django.db import models
from datetime import date

#function-type decorator
def addAttribute(attr, value):
    def wrap(meth):
        def wrapped(*args):
            return meth(*args)
        setattr(wrapped, attr, value)
        return wrapped
    return wrap

#class-type decorator
class set_attribute(object):
    def __init__(self, name, value):
        self.name = name 
        self.value = value
    
    def __call__(self, func):
        def wrapped(*args):
            return func(*args)
        setattr(wrapped, self.name, self.value)
        return wrapped

#USAGE
class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    
    @set_attribute('short_description', 'Published today?')
    def was_published_today(self):
        return self.pub_date.date() == date.today()