'The contributors to the question.'

@property
def contributors(self):

    cache_key = (self.contributors_cache_key % self.id)
    contributors = cache.get(cache_key)
    if (contributors is None):
        contributors = self.answers.all().values_list('creator_id', flat=True)
        contributors = list(contributors)
        contributors.append(self.creator_id)
        cache.add(cache_key, contributors, CACHE_TIMEOUT)
    return contributors
