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re-simplify notifications

This commit is contained in:
keyan 2022-04-13 15:48:16 -05:00
parent bc9f602d13
commit 3d6a7dc286
1 changed files with 3 additions and 13 deletions
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16
api/resolvers/notifications.js
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@ -64,25 +64,15 @@ export default {
// HACK to make notifications faster, we only return a limited sub set of the unioned
// queries ... we only ever need at most LIMIT+current offset in the child queries to
// have enough items to return in the union
// HACK 2.0 ... replies are slow because they could be a reply to multiple ancestors yet
// we should only get one notification for this reply ... the right
// way would be to make sure the reply query returns unique results but this is slow for users with
// many replies (you have to hash every reply) ... this hack avoids doing that by assuming there will be
// at most 25 ancesestors belonging to the same user for a given reply, see: (LIMIT+OFFSET)*25 which is
// undoubtably the case today ... this probably won't hold indefinitely though
// One other less HACKy way to do this is to store in each reply, an set of users it's in response to
// or to simply denormalize the replies (simply the ids which we wouldn't have to be concerned about consitency)
const notifications = await models.$queryRaw(`
SELECT DISTINCT *
FROM
((SELECT "Item".id::TEXT, "Item".created_at AS "sortTime", NULL as "earnedSats",
(SELECT DISTINCT "Item".id::TEXT, "Item".created_at AS "sortTime", NULL::BIGINT as "earnedSats",
'Reply' AS type
FROM "Item"
JOIN "Item" p ON "Item".path <@ p.path
WHERE p."userId" = $1
AND "Item"."userId" <> $1 AND "Item".created_at <= $2
ORDER BY "sortTime" DESC
LIMIT (${LIMIT}+$3) * 25)
LIMIT ${LIMIT}+$3)
UNION ALL
(SELECT "Item".id::TEXT, MAX("ItemAct".created_at) AS "sortTime",
sum("ItemAct".sats) as "earnedSats", 'Votification' AS type
@ -143,7 +133,7 @@ export default {
AND "confirmedAt" IS NOT NULL
AND created_at <= $2
ORDER BY "sortTime" DESC
LIMIT ${LIMIT}+$3)) AS n
LIMIT ${LIMIT}+$3)
ORDER BY "sortTime" DESC
OFFSET $3
LIMIT ${LIMIT}`, me.id, decodedCursor.time, decodedCursor.offset)