def update_content_list(instance, sender, created, **signal_args):
"""
Signal handler used add instances to the content list.
> Note that we do NOT need to add an 'if created' check in this function.
Since we're using a set instead of a list to store the data, we are
guaranteed to have a unique entries in the content list.
> We also want handle every post_save() event in the case that an object
is updated and its publish_date is changed, so we can update its zscore
(and thus its order in the set).
"""
# Use the publish_date of the object as the 'score' and add the object to the set
score = int(time.mktime(instance.publish_date.timetuple()))
redis.zadd(STORAGE_KEY, build_value(instance), score)
def remove_from_content_list(instance, sender, **signal_args):
" Signal handler used remove instances from the content list. "
redis.zrem(STORAGE_KEY, build_value(instance))