def _remove_post_tag_name(post_id, tag_name):
""" Removes a post-id form the set of tag-name -- post-ids. """
db.srem(tag_name + APPEND_TAG_NAME_POSTS, str(post_id))
if db.scard(tag_name + APPEND_TAG_NAME_POSTS) == 0:
db.delete(tag_name + APPEND_TAG_NAME_POSTS)
def get_favourite_count(username):
""" Returns the number of favourited posts by a user. """
if _is_user_created(username):
return db.scard(username + APPEND_KEY_FAVS)
else:
return -1