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73 lines
2.4 KiB
PL/PgSQL
73 lines
2.4 KiB
PL/PgSQL
-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
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create or replace function hot_rank(
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score numeric,
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published timestamp without time zone)
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returns integer as $$
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begin
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-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
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return 10000*sign(score)*log(1 + abs(score)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8);
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end; $$
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LANGUAGE plpgsql;
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create view post_view as
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with all_post as
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(
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select
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p.*,
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(select name from user_ where p.creator_id = user_.id) as creator_name,
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(select name from community where p.community_id = community.id) as community_name,
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(select count(*) from comment where comment.post_id = p.id) as number_of_comments,
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coalesce(sum(pl.score), 0) as score,
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count (case when pl.score = 1 then 1 else null end) as upvotes,
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count (case when pl.score = -1 then 1 else null end) as downvotes,
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hot_rank(coalesce(sum(pl.score) , 0), p.published) as hot_rank
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from post p
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left join post_like pl on p.id = pl.post_id
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group by p.id
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)
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select
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ap.*,
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u.id as user_id,
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coalesce(pl.score, 0) as my_vote,
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(select cf.id::bool from community_follower cf where u.id = cf.user_id and cf.community_id = ap.community_id) as subscribed
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from user_ u
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cross join all_post ap
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left join post_like pl on u.id = pl.user_id and ap.id = pl.post_id
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union all
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select
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ap.*,
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null as user_id,
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null as my_vote,
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null as subscribed
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from all_post ap
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;
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/* The old post view */
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/* create view post_view as */
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/* select */
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/* u.id as user_id, */
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/* pl.score as my_vote, */
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/* p.id as id, */
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/* p.name as name, */
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/* p.url, */
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/* p.body, */
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/* p.creator_id, */
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/* (select name from user_ where p.creator_id = user_.id) creator_name, */
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/* p.community_id, */
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/* (select name from community where p.community_id = community.id) as community_name, */
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/* (select count(*) from comment where comment.post_id = p.id) as number_of_comments, */
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/* coalesce(sum(pl.score) over (partition by p.id), 0) as score, */
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/* count (case when pl.score = 1 then 1 else null end) over (partition by p.id) as upvotes, */
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/* count (case when pl.score = -1 then 1 else null end) over (partition by p.id) as downvotes, */
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/* hot_rank(coalesce(sum(pl.score) over (partition by p.id) , 0), p.published) as hot_rank, */
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/* p.published, */
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/* p.updated */
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/* from user_ u */
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/* cross join post p */
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/* left join post_like pl on u.id = pl.user_id and p.id = pl.post_id; */
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