mirror of https://github.com/LemmyNet/lemmy.git
108 lines
2.6 KiB
PL/PgSQL
108 lines
2.6 KiB
PL/PgSQL
-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
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CREATE OR REPLACE FUNCTION hot_rank (score numeric, published timestamp without time zone)
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RETURNS integer
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AS $$
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BEGIN
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-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
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RETURN floor(10000 * log(greatest (1, score + 3)) / power(((EXTRACT(EPOCH FROM (timezone('utc', now()) - published)) / 3600) + 2), 1.8))::integer;
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END;
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$$
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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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SELECT
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p.*,
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(
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SELECT
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name
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FROM
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user_
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WHERE
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p.creator_id = user_.id) AS creator_name,
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(
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SELECT
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name
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FROM
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community
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WHERE
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p.community_id = community.id) AS community_name,
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(
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SELECT
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removed
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FROM
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community c
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WHERE
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p.community_id = c.id) AS community_removed,
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(
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SELECT
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count(*)
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FROM
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comment
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WHERE
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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(
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CASE WHEN pl.score = 1 THEN
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1
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ELSE
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NULL
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END) AS upvotes,
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count(
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CASE WHEN pl.score = - 1 THEN
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1
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ELSE
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NULL
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END) AS downvotes,
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hot_rank (coalesce(sum(pl.score), 0), p.published) AS hot_rank
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FROM
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post p
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LEFT JOIN post_like pl ON p.id = pl.post_id
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GROUP BY
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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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(
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SELECT
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cf.id::bool
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FROM
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community_follower cf
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WHERE
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u.id = cf.user_id
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AND cf.community_id = ap.community_id) AS subscribed,
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(
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SELECT
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pr.id::bool
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FROM
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post_read pr
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WHERE
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u.id = pr.user_id
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AND pr.post_id = ap.id) AS read,
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(
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SELECT
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ps.id::bool
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FROM
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post_saved ps
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WHERE
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u.id = ps.user_id
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AND ps.post_id = ap.id) AS saved
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FROM
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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
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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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NULL AS read,
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NULL AS saved
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FROM
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all_post ap;
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