denormalize item sats, comment sats, last comment time, and num comments
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keyan
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20a6a51492
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6aeeb40623
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@ -0,0 +1,86 @@
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-- 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();
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@ -147,29 +147,37 @@ enum Status {
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}
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model Item {
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id Int @id @default(autoincrement())
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createdAt DateTime @default(now()) @map(name: "created_at")
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updatedAt DateTime @default(now()) @updatedAt @map(name: "updated_at")
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title String?
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text String?
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url String?
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user User @relation("UserItems", fields: [userId], references: [id])
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userId Int
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fwdUser User? @relation(name: "FwdItem", fields: [fwdUserId], references: [id])
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fwdUserId Int?
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parent Item? @relation("ParentChildren", fields: [parentId], references: [id])
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parentId Int?
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children Item[] @relation("ParentChildren")
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actions ItemAct[]
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mentions Mention[]
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path Unsupported("LTREE")?
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pin Pin? @relation(fields: [pinId], references: [id])
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pinId Int?
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weightedVotes Float @default(0)
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boost Int @default(0)
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uploadId Int?
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upload Upload?
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paidImgLink Boolean @default(false)
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id Int @id @default(autoincrement())
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createdAt DateTime @default(now()) @map(name: "created_at")
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updatedAt DateTime @default(now()) @updatedAt @map(name: "updated_at")
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title String?
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text String?
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url String?
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user User @relation("UserItems", fields: [userId], references: [id])
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userId Int
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fwdUser User? @relation(name: "FwdItem", fields: [fwdUserId], references: [id])
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fwdUserId Int?
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parent Item? @relation("ParentChildren", fields: [parentId], references: [id])
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parentId Int?
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children Item[] @relation("ParentChildren")
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actions ItemAct[]
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mentions Mention[]
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path Unsupported("LTREE")?
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pin Pin? @relation(fields: [pinId], references: [id])
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pinId Int?
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boost Int @default(0)
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uploadId Int?
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upload Upload?
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paidImgLink Boolean @default(false)
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// denormalized self stats
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weightedVotes Float @default(0)
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sats Int @default(0)
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// denormalized comment stats
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ncomments Int @default(0)
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commentSats Int @default(0)
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lastCommentAt DateTime?
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// if sub is null, this is the main sub
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sub Sub? @relation(fields: [subName], references: [name])
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