50 lines
2.0 KiB
MySQL
50 lines
2.0 KiB
MySQL
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UPDATE "Item"
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SET "weightedComments" = sub."weightedComments"
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FROM (
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SELECT subsub."itemId", SUM(subsub."userTrust") AS "weightedComments"
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FROM
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(SELECT p.id AS "itemId", u.id AS "userId", u.trust AS "userTrust"
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FROM "Item" p
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-- all decendants of p that aren't from the same author
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JOIN "Item" c ON c.path <@ p.path AND c.id <> p.id AND c."userId" <> p."userId"
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JOIN users u ON u.id = c."userId"
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WHERE u.trust > 0
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GROUP BY p.id, u.id, u.trust) subsub
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GROUP BY subsub."itemId") sub
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WHERE "Item".id = sub."itemId";
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-- TODO: this could be better, e.g. testing for comment length or using comment votes instead
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-- of just comment presence ... this is just an mvp
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CREATE OR REPLACE FUNCTION ncomments_after_comment() RETURNS TRIGGER AS $$
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DECLARE
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user_trust DOUBLE PRECISION;
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BEGIN
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-- grab user's trust who is commenting
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SELECT trust INTO user_trust FROM users WHERE id = NEW."userId";
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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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-- we only want to add the user's trust to weightedComments if they aren't
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-- already the author of a descendant comment
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UPDATE "Item"
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SET "weightedComments" = "weightedComments" + user_trust
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FROM (
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-- for every ancestor of the new comment, return the ones that don't have
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-- the same author in their descendants
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SELECT p.id
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FROM "Item" p
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-- all decendants of p that aren't the new comment
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JOIN "Item" c ON c.path <@ p.path AND c.id <> NEW.id
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-- p is an ancestor of this comment, it isn't itself, and it doesn't have the same author
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WHERE p.path @> NEW.path AND p.id <> NEW.id AND p."userId" <> NEW."userId"
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GROUP BY p.id
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-- only return p if it doesn't have any descendants with the same author as the comment
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HAVING bool_and(c."userId" <> NEW."userId")
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) fresh
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WHERE "Item".id = fresh.id;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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