166 lines
4.4 KiB
Python
166 lines
4.4 KiB
Python
from sqlalchemy import and_, select, distinct, func
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from sqlalchemy.orm import aliased
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from auth.authenticate import login_required
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from base.orm import local_session
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from base.resolvers import mutation, query
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from orm.shout import ShoutTopic, ShoutAuthor
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from orm.topic import Topic, TopicFollower
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from orm import User
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def add_topic_stat_columns(q):
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aliased_shout_author = aliased(ShoutAuthor)
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aliased_topic_follower = aliased(TopicFollower)
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q = q.outerjoin(ShoutTopic, Topic.id == ShoutTopic.topic).add_columns(
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func.count(distinct(ShoutTopic.shout)).label('shouts_stat')
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).outerjoin(aliased_shout_author, ShoutTopic.shout == aliased_shout_author.shout).add_columns(
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func.count(distinct(aliased_shout_author.user)).label('authors_stat')
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).outerjoin(aliased_topic_follower).add_columns(
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func.count(distinct(aliased_topic_follower.follower)).label('followers_stat')
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)
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q = q.group_by(Topic.id)
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return q
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def add_stat(topic, stat_columns):
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[shouts_stat, authors_stat, followers_stat] = stat_columns
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topic.stat = {
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"shouts": shouts_stat,
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"authors": authors_stat,
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"followers": followers_stat
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}
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return topic
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def get_topics_from_query(q):
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topics = []
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with local_session() as session:
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for [topic, *stat_columns] in session.execute(q):
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topic = add_stat(topic, stat_columns)
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topics.append(topic)
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return topics
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def followed_by_user(user_id):
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q = select(Topic)
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q = add_topic_stat_columns(q)
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q = q.join(TopicFollower).where(TopicFollower.follower == user_id)
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return get_topics_from_query(q)
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@query.field("topicsAll")
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async def topics_all(_, _info):
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q = select(Topic)
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q = add_topic_stat_columns(q)
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return get_topics_from_query(q)
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@query.field("topicsByCommunity")
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async def topics_by_community(_, info, community):
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q = select(Topic).where(Topic.community == community)
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q = add_topic_stat_columns(q)
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return get_topics_from_query(q)
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@query.field("topicsByAuthor")
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async def topics_by_author(_, _info, author):
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q = select(Topic)
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q = add_topic_stat_columns(q)
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q = q.join(User).where(User.slug == author)
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return get_topics_from_query(q)
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@query.field("getTopic")
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async def get_topic(_, _info, slug):
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q = select(Topic).where(Topic.slug == slug)
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q = add_topic_stat_columns(q)
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topics = get_topics_from_query(q)
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return topics[0]
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@mutation.field("createTopic")
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@login_required
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async def create_topic(_, _info, inp):
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with local_session() as session:
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# TODO: check user permissions to create topic for exact community
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new_topic = Topic.create(**inp)
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session.add(new_topic)
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session.commit()
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return {"topic": new_topic}
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@mutation.field("updateTopic")
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@login_required
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async def update_topic(_, _info, inp):
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slug = inp["slug"]
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with local_session() as session:
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topic = session.query(Topic).filter(Topic.slug == slug).first()
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if not topic:
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return {"error": "topic not found"}
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else:
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topic.update(**inp)
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session.commit()
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return {"topic": topic}
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def topic_follow(user_id, slug):
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try:
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with local_session() as session:
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topic = session.query(Topic).where(Topic.slug == slug).one()
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following = TopicFollower.create(topic=topic.id, follower=user_id)
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session.add(following)
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session.commit()
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return True
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except:
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return False
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def topic_unfollow(user_id, slug):
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try:
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with local_session() as session:
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sub = (
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session.query(TopicFollower).join(Topic).filter(
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and_(
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TopicFollower.follower == user_id,
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Topic.slug == slug
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)
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).first()
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)
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if sub:
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session.delete(sub)
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session.commit()
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return True
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except:
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pass
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return False
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@query.field("topicsRandom")
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async def topics_random(_, info, amount=12):
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q = select(Topic)
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q = q.join(ShoutTopic)
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q = q.group_by(Topic.id)
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q = q.having(func.count(distinct(ShoutTopic.shout)) > 2)
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q = q.order_by(func.random()).limit(amount)
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topics = []
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with local_session() as session:
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for [topic] in session.execute(q):
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topics.append(topic)
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return topics
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