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9c1b9ff3cf
* Update community statistics after post or comment is deleted by user * Update triggers for site and person aggregates * Restore comment counts when post is restored * Simplify insertion/deletion trigger checks before updating statistics
328 lines
10 KiB
PL/PgSQL
328 lines
10 KiB
PL/PgSQL
drop trigger if exists community_aggregates_post_count on post;
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drop trigger if exists community_aggregates_comment_count on comment;
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drop trigger if exists site_aggregates_comment_insert on comment;
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drop trigger if exists site_aggregates_comment_delete on comment;
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drop trigger if exists site_aggregates_post_insert on post;
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drop trigger if exists site_aggregates_post_delete on post;
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drop trigger if exists site_aggregates_community_insert on community;
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drop trigger if exists site_aggregates_community_delete on community;
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drop trigger if exists person_aggregates_post_count on post;
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drop trigger if exists person_aggregates_comment_count on comment;
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create or replace function was_removed_or_deleted(TG_OP text, OLD record, NEW record)
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RETURNS boolean
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LANGUAGE plpgsql
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as $$
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begin
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IF (TG_OP = 'INSERT') THEN
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return false;
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end if;
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IF (TG_OP = 'DELETE') THEN
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return true;
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end if;
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return TG_OP = 'UPDATE' AND (
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(OLD.deleted = 'f' AND NEW.deleted = 't') OR
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(OLD.removed = 'f' AND NEW.removed = 't')
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);
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END $$;
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create or replace function was_restored_or_created(TG_OP text, OLD record, NEW record)
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RETURNS boolean
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LANGUAGE plpgsql
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as $$
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begin
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IF (TG_OP = 'DELETE') THEN
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return false;
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end if;
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IF (TG_OP = 'INSERT') THEN
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return true;
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end if;
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return TG_OP = 'UPDATE' AND (
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(OLD.deleted = 't' AND NEW.deleted = 'f') OR
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(OLD.removed = 't' AND NEW.removed = 'f')
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);
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END $$;
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-- Community aggregate functions
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create or replace function community_aggregates_post_count()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update community_aggregates
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set posts = posts + 1 where community_id = NEW.community_id;
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IF (TG_OP = 'UPDATE') THEN
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-- Post was restored, so restore comment counts as well
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update community_aggregates ca
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set posts = coalesce(cd.posts, 0),
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comments = coalesce(cd.comments, 0)
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from (
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select
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c.id,
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count(distinct p.id) as posts,
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count(distinct ct.id) as comments
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from community c
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left join post p on c.id = p.community_id and p.deleted = 'f' and p.removed = 'f'
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left join comment ct on p.id = ct.post_id and ct.deleted = 'f' and ct.removed = 'f'
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where c.id = NEW.community_id
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group by c.id
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) cd
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where ca.community_id = NEW.community_id;
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END IF;
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ELSIF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update community_aggregates
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set posts = posts - 1 where community_id = OLD.community_id;
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-- Update the counts if the post got deleted
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update community_aggregates ca
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set posts = coalesce(cd.posts, 0),
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comments = coalesce(cd.comments, 0)
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from (
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select
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c.id,
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count(distinct p.id) as posts,
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count(distinct ct.id) as comments
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from community c
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left join post p on c.id = p.community_id and p.deleted = 'f' and p.removed = 'f'
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left join comment ct on p.id = ct.post_id and ct.deleted = 'f' and ct.removed = 'f'
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where c.id = OLD.community_id
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group by c.id
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) cd
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where ca.community_id = OLD.community_id;
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END IF;
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return null;
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end $$;
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-- comment count
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create or replace function community_aggregates_comment_count()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update community_aggregates ca
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set comments = comments + 1 from comment c, post p
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where p.id = c.post_id
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and p.id = NEW.post_id
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and ca.community_id = p.community_id;
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ELSIF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update community_aggregates ca
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set comments = comments - 1 from comment c, post p
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where p.id = c.post_id
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and p.id = OLD.post_id
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and ca.community_id = p.community_id;
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END IF;
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return null;
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end $$;
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-- Community aggregate triggers
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create trigger community_aggregates_post_count
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after insert or delete or update of removed, deleted on post
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for each row
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execute procedure community_aggregates_post_count();
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create trigger community_aggregates_comment_count
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after insert or delete or update of removed, deleted on comment
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for each row
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execute procedure community_aggregates_comment_count();
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-- Site aggregate functions
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create or replace function site_aggregates_post_insert()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update site_aggregates sa
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set posts = posts + 1
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from site s
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where sa.site_id = s.id;
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END IF;
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return null;
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end $$;
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create or replace function site_aggregates_post_delete()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update site_aggregates sa
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set posts = posts - 1
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from site s
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where sa.site_id = s.id;
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END IF;
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return null;
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end $$;
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create or replace function site_aggregates_comment_insert()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update site_aggregates sa
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set comments = comments + 1
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from site s
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where sa.site_id = s.id;
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END IF;
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return null;
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end $$;
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create or replace function site_aggregates_comment_delete()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update site_aggregates sa
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set comments = comments - 1
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from site s
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where sa.site_id = s.id;
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END IF;
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return null;
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end $$;
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create or replace function site_aggregates_community_insert()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update site_aggregates sa
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set communities = communities + 1
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from site s
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where sa.site_id = s.id;
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END IF;
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return null;
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end $$;
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create or replace function site_aggregates_community_delete()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update site_aggregates sa
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set communities = communities - 1
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from site s
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where sa.site_id = s.id;
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END IF;
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return null;
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end $$;
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-- Site aggregate triggers
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create trigger site_aggregates_post_insert
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after insert or update of removed, deleted on post
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for each row
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when (NEW.local = true)
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execute procedure site_aggregates_post_insert();
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create trigger site_aggregates_post_delete
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after delete or update of removed, deleted on post
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for each row
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when (OLD.local = true)
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execute procedure site_aggregates_post_delete();
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create trigger site_aggregates_comment_insert
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after insert or update of removed, deleted on comment
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for each row
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when (NEW.local = true)
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execute procedure site_aggregates_comment_insert();
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create trigger site_aggregates_comment_delete
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after delete or update of removed, deleted on comment
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for each row
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when (OLD.local = true)
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execute procedure site_aggregates_comment_delete();
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create trigger site_aggregates_community_insert
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after insert or update of removed, deleted on community
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for each row
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when (NEW.local = true)
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execute procedure site_aggregates_community_insert();
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create trigger site_aggregates_community_delete
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after delete or update of removed, deleted on community
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for each row
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when (OLD.local = true)
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execute procedure site_aggregates_community_delete();
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-- Person aggregate functions
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create or replace function person_aggregates_post_count()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update person_aggregates
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set post_count = post_count + 1 where person_id = NEW.creator_id;
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ELSIF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update person_aggregates
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set post_count = post_count - 1 where person_id = OLD.creator_id;
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-- If the post gets deleted, the score calculation trigger won't fire,
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-- so you need to re-calculate
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update person_aggregates ua
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set post_score = pd.score
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from (
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select u.id,
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coalesce(0, sum(pl.score)) as score
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-- User join because posts could be empty
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from person u
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left join post p on u.id = p.creator_id and p.deleted = 'f' and p.removed = 'f'
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left join post_like pl on p.id = pl.post_id
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group by u.id
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) pd
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where ua.person_id = OLD.creator_id;
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END IF;
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return null;
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end $$;
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create or replace function person_aggregates_comment_count()
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returns trigger language plpgsql
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as $$
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begin
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IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
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update person_aggregates
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set comment_count = comment_count + 1 where person_id = NEW.creator_id;
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ELSIF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
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update person_aggregates
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set comment_count = comment_count - 1 where person_id = OLD.creator_id;
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-- If the comment gets deleted, the score calculation trigger won't fire,
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-- so you need to re-calculate
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update person_aggregates ua
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set comment_score = cd.score
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from (
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select u.id,
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coalesce(0, sum(cl.score)) as score
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-- User join because comments could be empty
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from person u
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left join comment c on u.id = c.creator_id and c.deleted = 'f' and c.removed = 'f'
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left join comment_like cl on c.id = cl.comment_id
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group by u.id
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) cd
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where ua.person_id = OLD.creator_id;
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END IF;
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return null;
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end $$;
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-- Person aggregate triggers
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create trigger person_aggregates_post_count
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after insert or delete or update of removed, deleted on post
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for each row
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execute procedure person_aggregates_post_count();
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create trigger person_aggregates_comment_count
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after insert or delete or update of removed, deleted on comment
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for each row
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execute procedure person_aggregates_comment_count();
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