def __init__(self, *a, **k):
super(Song, self).__init__(*a, **k)
self.slug = slugify(self.title)
if not re.match(r'^\d+:\d{2}$', self.duration):
raise InvalidInput("invalid duration")
if type(self.track) != int and not self.track.isdigit():
raise InvalidInput("invalid track")
def __init__(self, *a, **k):
super(Album, self).__init__(*a, **k)
self.city_slug = slugify(self.city)
self.venue_slug = slugify(self.venue)
if not self.date_added:
self.date_added = datetime.datetime.now()
