86 lines
2.6 KiB
PL/PgSQL
86 lines
2.6 KiB
PL/PgSQL
-- AlterTable
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ALTER TABLE "Item"
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ADD COLUMN IF NOT EXISTS "commentSats" INTEGER NOT NULL DEFAULT 0,
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ADD COLUMN IF NOT EXISTS "lastCommentAt" TIMESTAMP(3),
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ADD COLUMN IF NOT EXISTS "ncomments" INTEGER NOT NULL DEFAULT 0,
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ADD COLUMN IF NOT EXISTS "sats" INTEGER NOT NULL DEFAULT 0;
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-- denormalize all existing comments
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-- for every item, compute the lastest comment time and number of comments
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UPDATE "Item"
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SET "lastCommentAt" = subquery."lastCommentAt", ncomments = subquery.ncomments
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FROM (
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SELECT a.id, MAX(b.created_at) AS "lastCommentAt", COUNT(b.id) AS ncomments
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FROM "Item" a
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LEFT JOIN "Item" b ON b.path <@ a.path AND a.id <> b.id
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GROUP BY a.id) subquery
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WHERE "Item".id = subquery.id;
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-- on comment denormalize comment count and time
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CREATE OR REPLACE FUNCTION ncomments_after_comment() RETURNS TRIGGER AS $$
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DECLARE
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BEGIN
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UPDATE "Item"
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SET "lastCommentAt" = now_utc(), "ncomments" = "ncomments" + 1
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WHERE id <> NEW.id and path @> NEW.path;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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DROP TRIGGER IF EXISTS ncomments_after_comment_trigger ON "Item";
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CREATE TRIGGER ncomments_after_comment_trigger
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AFTER INSERT ON "Item"
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FOR EACH ROW
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EXECUTE PROCEDURE ncomments_after_comment();
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-- denormalize all existing sats
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-- for every item, compute the total sats it has earned
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UPDATE "Item"
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SET sats = subquery.sats
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FROM (
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SELECT a.id, SUM(c.sats) AS sats
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FROM "Item" a
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JOIN "ItemAct" c ON c."itemId" = a.id AND c."userId" <> a."userId"
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WHERE c.act IN ('VOTE', 'TIP')
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GROUP BY a.id) subquery
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WHERE "Item".id = subquery.id;
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-- denormalize comment sats
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UPDATE "Item"
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SET "commentSats" = subquery."commentSats"
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FROM (
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SELECT a.id, SUM(b.sats) AS "commentSats"
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FROM "Item" a
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JOIN "Item" b ON b.path <@ a.path AND a.id <> b.id
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GROUP BY a.id) subquery
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WHERE "Item".id = subquery.id;
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-- on item act denormalize sats and comment sats
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CREATE OR REPLACE FUNCTION sats_after_act() RETURNS TRIGGER AS $$
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DECLARE
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item "Item";
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BEGIN
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SELECT * FROM "Item" WHERE id = NEW."itemId" INTO item;
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IF item."userId" = NEW."userId" THEN
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RETURN NEW;
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END IF;
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UPDATE "Item"
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SET "sats" = "sats" + NEW.sats
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WHERE id = item.id;
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UPDATE "Item"
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SET "commentSats" = "commentSats" + NEW.sats
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WHERE id <> item.id and path @> item.path;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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DROP TRIGGER IF EXISTS sats_after_act_trigger ON "ItemAct";
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CREATE TRIGGER sats_after_act_trigger
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AFTER INSERT ON "ItemAct"
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FOR EACH ROW
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WHEN (NEW.act = 'VOTE' or NEW.act = 'TIP')
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EXECUTE PROCEDURE sats_after_act(); |