def get_topic(id, user=None):
"""Gets a single topic (formatted by json_data) from redis or postgresql
And performs some pre-filters for the current user
Args:
id (int): id
user (User): the current user
Returns:
None if the topic is not existed or a dict of topic data
"""
id = int(id)
key = Topic.cache_key(id)
redis_client = get_client(key)
topic = None
if not redis_client.exists(key):
topic = Topic.find_by_pk(id)
if topic:
data = topic.json_data()
redis_client.set(key, json.dumps(data))
topic = data
else:
if redis_client.type(key) == 'hash':
print redis_client
topic = json.loads(redis_client.get(key))
topic['user_vote'] = Topic.check_vote(user, topic['id'])
return topic
def update_topic(id, topic=None):
"""Updates the cache of article :id
Args:
id (int): topic id
topic (Topic): if not provided, a topic will be queried from postgresql
Returns:
Topic
"""
id = int(id)
if not topic:
topic = Topic.find_by_pk(id)
if topic:
key = Topic.cache_key(id)
redis_client = get_client(key)
data = topic.json_data()
redis_client.set(key, json.dumps(data))
return topic
