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perf(backend): avoid N+1 selects from user table when packing many entities (#13911)

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* perf(backend): avoid N+1 selects from `user` table when packing many entities

* perf(backend): use `packMany` instead of mapping to `pack`
This commit is contained in:
zyoshoka
2024-05-31 15:32:42 +09:00
committed by GitHub
parent 97be1a53ad
commit 514a65e453
24 changed files with 268 additions and 87 deletions
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10
packages/backend/src/server/api/endpoints/users/get-frequently-replied-users.ts
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@@ -118,12 +118,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
const repliedUsersSorted = Object.keys(repliedUsers).sort((a, b) => repliedUsers[b] - repliedUsers[a]);
// Extract top replied users
const topRepliedUsers = repliedUsersSorted.slice(0, ps.limit);
const topRepliedUserIds = repliedUsersSorted.slice(0, ps.limit);
// Make replies object (includes weights)
const repliesObj = await Promise.all(topRepliedUsers.map(async (user) => ({
user: await this.userEntityService.pack(user, me, { schema: 'UserDetailed' }),
weight: repliedUsers[user] / peak,
const _userMap = await this.userEntityService.packMany(topRepliedUserIds, me, { schema: 'UserDetailed' })
.then(users => new Map(users.map(u => [u.id, u])));
const repliesObj = await Promise.all(topRepliedUserIds.map(async (userId) => ({
user: _userMap.get(userId) ?? await this.userEntityService.pack(userId, me, { schema: 'UserDetailed' }),
weight: repliedUsers[userId] / peak,
})));
return repliesObj;

6
packages/backend/src/server/api/endpoints/users/show.ts
View File

@@ -117,9 +117,9 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
if (user != null) _users.push(user);
}
return await Promise.all(_users.map(u => this.userEntityService.pack(u, me, {
schema: 'UserDetailed',
})));
const _userMap = await this.userEntityService.packMany(_users, me, { schema: 'UserDetailed' })
.then(users => new Map(users.map(u => [u.id, u])));
return _users.map(u => _userMap.get(u.id)!);
} else {
// Lookup user
if (typeof ps.host === 'string' && typeof ps.username === 'string') {