106 lines
3.1 KiB
Python
106 lines
3.1 KiB
Python
from sqlalchemy import func, distinct, select, join
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from sqlalchemy.orm import aliased
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from orm.topic import TopicFollower, Topic
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from resolvers.rating import load_author_ratings
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from services.db import local_session
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from orm.author import AuthorFollower, Author
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from orm.shout import ShoutTopic, ShoutAuthor
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from services.logger import root_logger as logger
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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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aliased_shout_topic = aliased(ShoutTopic)
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q = (
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q.outerjoin(aliased_shout_topic, aliased_shout_topic.topic == Topic.id)
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.add_columns(
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func.count(distinct(aliased_shout_topic.shout)).label('shouts_stat')
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)
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.outerjoin(
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aliased_shout_author,
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aliased_shout_topic.shout == aliased_shout_author.shout,
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)
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.add_columns(
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func.count(distinct(aliased_shout_author.author)).label('authors_stat')
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)
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.outerjoin(aliased_topic_follower)
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.add_columns(
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func.count(distinct(aliased_topic_follower.follower)).label(
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'followers_stat'
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)
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)
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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_author_stat_columns(q):
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aliased_shout_author = aliased(ShoutAuthor)
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aliased_author_authors = aliased(AuthorFollower)
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aliased_author_followers = aliased(AuthorFollower)
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q = (
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q.outerjoin(aliased_shout_author, aliased_shout_author.author == Author.id)
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.add_columns(
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func.count(distinct(aliased_shout_author.shout)).label('shouts_stat')
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)
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.outerjoin(aliased_author_authors, aliased_author_authors.follower == Author.id)
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.add_columns(
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func.count(distinct(aliased_shout_author.author)).label('authors_stat')
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)
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.outerjoin(
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aliased_author_followers, aliased_author_followers.author == Author.id
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)
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.add_columns(
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func.count(distinct(aliased_author_followers.follower)).label(
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'followers_stat'
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)
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)
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)
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q = q.group_by(Author.id)
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return q
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def get_with_stat(q):
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q = add_author_stat_columns(q)
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records = []
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logger.debug(q.replace('\n', ' '))
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with local_session() as session:
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for [entity, shouts_stat, authors_stat, followers_stat] in session.execute(q):
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entity.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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if q.startswith('SELECT author'):
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load_author_ratings(session, entity)
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records.append(entity)
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return records
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def author_follows_authors(author_id: int):
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af = aliased(AuthorFollower, name='af')
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q = (
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select(Author)
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.select_from(join(Author, af, Author.id == af.author))
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.where(af.follower == author_id)
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)
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return get_with_stat(q)
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def author_follows_topics(author_id: int):
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q = (
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select(Topic)
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.select_from(join(Topic, TopicFollower, Topic.id == TopicFollower.topic))
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.where(TopicFollower.follower == author_id)
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)
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return get_with_stat(q)
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