142 lines
4.7 KiB
Python
142 lines
4.7 KiB
Python
from sqlalchemy import func, distinct, select, join, and_, case, true
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from sqlalchemy.orm import aliased
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from orm.reaction import Reaction, ReactionKind
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from orm.topic import TopicFollower, Topic
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from services.db import local_session
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from orm.author import AuthorFollower, Author, AuthorRating
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from orm.shout import ShoutTopic, ShoutAuthor, Shout
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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 add_author_ratings(q):
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aliased_author = aliased(Author)
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ratings_subquery = (
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select([
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aliased_author.id.label('author_id'),
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func.count().filter(and_(
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Reaction.created_by == aliased_author.id,
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Reaction.kind == ReactionKind.COMMENT.value,
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Reaction.deleted_at.is_(None),
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)).label('comments_count'),
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func.sum(case((AuthorRating.plus == true(), 1), else_=0)).label('likes_count'),
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func.sum(case((AuthorRating.plus != true(), 1), else_=0)).label('dislikes_count'),
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func.sum(case((and_(Reaction.kind == ReactionKind.LIKE.value, Shout.authors.any(id=aliased_author.id)), 1), else_=0)).label('shouts_likes'),
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func.sum(case((and_(Reaction.kind == ReactionKind.DISLIKE.value, Shout.authors.any(id=aliased_author.id)), 1), else_=0)).label('shouts_dislikes')
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])
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.select_from(aliased_author)
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.join(AuthorRating, AuthorRating.author == aliased_author.id)
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.outerjoin(Shout, Shout.authors.any(id=aliased_author.id))
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.filter(
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Reaction.deleted_at.is_(None)
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)
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.group_by(aliased_author.id)
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.alias('ratings_subquery')
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)
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q = q.join(ratings_subquery, Author.id == ratings_subquery.c.author_id)
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return q
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def get_with_stat(q):
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is_author = f'{q}'.lower().startswith('select author')
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is_topic = f'{q}'.lower().startswith('select topic')
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if is_author:
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q = add_author_stat_columns(q)
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q = add_author_ratings(q)
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elif is_topic:
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q = add_topic_stat_columns(q)
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records = []
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logger.debug(f'{q}'.replace('\n', ' '))
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with local_session() as session:
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for cols in session.execute(q):
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entity = cols[0]
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entity.stat = {'shouts': cols[1], 'authors': cols[2], 'followers': cols[3]}
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if is_author:
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entity.stat['comments'] = cols[4]
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entity.stat['rating'] = cols[5] - cols[6]
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entity.stat['rating_shouts'] = cols[7] - cols[8]
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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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