Starting to work on user aggs.

migrations/2020-12-03-035643_create_user_aggregates/down.sql

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+-- This file should undo anything in `up.sql`

migrations/2020-12-03-035643_create_user_aggregates/up.sql

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+-- Add user aggregates
+create table user_aggregates (
+  id serial primary key,
+  user_id int references user_ on update cascade on delete cascade not null,
+  post_count bigint not null,
+  post_score bigint not null,
+  comment_count bigint not null,
+  comment_score bigint not null,
+  unique (user_id)
+);
+
+insert into user_aggregates (user_id, post_count, post_score, comment_count, comment_score)
+  select u.id,
+  coalesce(pd.posts, 0),
+  coalesce(pd.score, 0),
+  coalesce(cd.comments, 0),
+  coalesce(cd.score, 0)
+  from user_ u
+  left join (
+    select p.creator_id,
+      count(distinct p.id) as posts,
+      sum(pl.score) as score
+      from post p
+      left join post_like pl on p.id = pl.post_id
+      group by p.creator_id
+    ) pd on u.id = pd.creator_id
+  left join ( 
+    select c.creator_id,
+    count(distinct c.id) as comments,
+    sum(cl.score) as score
+    from comment c
+    left join comment_like cl on c.id = cl.comment_id
+    group by c.creator_id
+  ) cd on u.id = cd.creator_id;
+
+
+-- Add site aggregate triggers
+-- user
+create function site_aggregates_user_increment()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set users = users + 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_insert_user
+after insert on user_
+execute procedure site_aggregates_user_increment();
+
+create function site_aggregates_user_decrement()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set users = users - 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_delete_user
+after delete on user_
+execute procedure site_aggregates_user_decrement();
+
+-- post
+create function site_aggregates_post_increment()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set posts = posts + 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_insert_post
+after insert on post
+execute procedure site_aggregates_post_increment();
+
+create function site_aggregates_post_decrement()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set posts = posts - 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_delete_post
+after delete on post
+execute procedure site_aggregates_post_decrement();
+
+-- comment
+create function site_aggregates_comment_increment()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set comments = comments + 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_insert_comment
+after insert on comment
+execute procedure site_aggregates_comment_increment();
+
+create function site_aggregates_comment_decrement()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set comments = comments - 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_delete_comment
+after delete on comment
+execute procedure site_aggregates_comment_decrement();
+
+-- community
+create function site_aggregates_community_increment()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set communities = communities + 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_insert_community
+after insert on community
+execute procedure site_aggregates_community_increment();
+
+create function site_aggregates_community_decrement()
+returns trigger language plpgsql
+as $$
+begin
+  update site_aggregates 
+  set communities = communities - 1;
+  return null;
+end $$;
+
+create trigger site_aggregates_delete_community
+after delete on community
+execute procedure site_aggregates_community_decrement();
+