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

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

* perf(backend): use `packMany` instead of mapping to `pack`

packages/backend/src/core/entities/AbuseUserReportEntityService.ts

@@ -10,6 +10,8 @@ import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { MiAbuseUserReport } from '@/models/AbuseUserReport.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
+import { isNotNull } from '@/misc/is-not-null.js';
+import type { Packed } from '@/misc/json-schema.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -26,6 +28,11 @@ export class AbuseUserReportEntityService {
 	@bindThis
 	public async pack(
 		src: MiAbuseUserReport['id'] | MiAbuseUserReport,
+		hint?: {
+			packedReporter?: Packed<'UserDetailedNotMe'>,
+			packedTargetUser?: Packed<'UserDetailedNotMe'>,
+			packedAssignee?: Packed<'UserDetailedNotMe'>,
+		},
 	) {
 		const report = typeof src === 'object' ? src : await this.abuseUserReportsRepository.findOneByOrFail({ id: src });
 
@@ -37,13 +44,13 @@ export class AbuseUserReportEntityService {
 			reporterId: report.reporterId,
 			targetUserId: report.targetUserId,
 			assigneeId: report.assigneeId,
-			reporter: this.userEntityService.pack(report.reporter ?? report.reporterId, null, {
+			reporter: hint?.packedReporter ?? this.userEntityService.pack(report.reporter ?? report.reporterId, null, {
 				schema: 'UserDetailedNotMe',
 			}),
-			targetUser: this.userEntityService.pack(report.targetUser ?? report.targetUserId, null, {
+			targetUser: hint?.packedTargetUser ?? this.userEntityService.pack(report.targetUser ?? report.targetUserId, null, {
 				schema: 'UserDetailedNotMe',
 			}),
-			assignee: report.assigneeId ? this.userEntityService.pack(report.assignee ?? report.assigneeId, null, {
+			assignee: report.assigneeId ? hint?.packedAssignee ?? this.userEntityService.pack(report.assignee ?? report.assigneeId, null, {
 				schema: 'UserDetailedNotMe',
 			}) : null,
 			forwarded: report.forwarded,
@@ -51,9 +58,24 @@ export class AbuseUserReportEntityService {
 	}
 
 	@bindThis
-	public packMany(
-		reports: any[],
+	public async packMany(
+		reports: MiAbuseUserReport[],
 	) {
-		return Promise.all(reports.map(x => this.pack(x)));
+		const _reporters = reports.map(({ reporter, reporterId }) => reporter ?? reporterId);
+		const _targetUsers = reports.map(({ targetUser, targetUserId }) => targetUser ?? targetUserId);
+		const _assignees = reports.map(({ assignee, assigneeId }) => assignee ?? assigneeId).filter(isNotNull);
+		const _userMap = await this.userEntityService.packMany(
+			[..._reporters, ..._targetUsers, ..._assignees],
+			null,
+			{ schema: 'UserDetailedNotMe' },
+		).then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(
+			reports.map(report => {
+				const packedReporter = _userMap.get(report.reporterId);
+				const packedTargetUser = _userMap.get(report.targetUserId);
+				const packedAssignee = report.assigneeId != null ? _userMap.get(report.assigneeId) : undefined;
+				return this.pack(report, { packedReporter, packedTargetUser, packedAssignee });
+			}),
+		);
 	}
 }

packages/backend/src/core/entities/BlockingEntityService.ts

@@ -29,6 +29,9 @@ export class BlockingEntityService {
 	public async pack(
 		src: MiBlocking['id'] | MiBlocking,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hint?: {
+			blockee?: Packed<'UserDetailedNotMe'>,
+		},
 	): Promise<Packed<'Blocking'>> {
 		const blocking = typeof src === 'object' ? src : await this.blockingsRepository.findOneByOrFail({ id: src });
 
@@ -36,17 +39,20 @@ export class BlockingEntityService {
 			id: blocking.id,
 			createdAt: this.idService.parse(blocking.id).date.toISOString(),
 			blockeeId: blocking.blockeeId,
-			blockee: this.userEntityService.pack(blocking.blockeeId, me, {
+			blockee: hint?.blockee ?? this.userEntityService.pack(blocking.blockeeId, me, {
 				schema: 'UserDetailedNotMe',
 			}),
 		});
 	}
 
 	@bindThis
-	public packMany(
-		blockings: any[],
+	public async packMany(
+		blockings: MiBlocking[],
 		me: { id: MiUser['id'] },
 	) {
-		return Promise.all(blockings.map(x => this.pack(x, me)));
+		const _blockees = blockings.map(({ blockee, blockeeId }) => blockee ?? blockeeId);
+		const _userMap = await this.userEntityService.packMany(_blockees, me, { schema: 'UserDetailedNotMe' })
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(blockings.map(blocking => this.pack(blocking, me, { blockee: _userMap.get(blocking.blockeeId) })));
 	}
 }

packages/backend/src/core/entities/ClipEntityService.ts

@@ -35,6 +35,9 @@ export class ClipEntityService {
 	public async pack(
 		src: MiClip['id'] | MiClip,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hint?: {
+			packedUser?: Packed<'UserLite'>
+		},
 	): Promise<Packed<'Clip'>> {
 		const meId = me ? me.id : null;
 		const clip = typeof src === 'object' ? src : await this.clipsRepository.findOneByOrFail({ id: src });
@@ -44,7 +47,7 @@ export class ClipEntityService {
 			createdAt: this.idService.parse(clip.id).date.toISOString(),
 			lastClippedAt: clip.lastClippedAt ? clip.lastClippedAt.toISOString() : null,
 			userId: clip.userId,
-			user: this.userEntityService.pack(clip.user ?? clip.userId),
+			user: hint?.packedUser ?? this.userEntityService.pack(clip.user ?? clip.userId),
 			name: clip.name,
 			description: clip.description,
 			isPublic: clip.isPublic,
@@ -55,11 +58,14 @@ export class ClipEntityService {
 	}
 
 	@bindThis
-	public packMany(
+	public async packMany(
 		clips: MiClip[],
 		me?: { id: MiUser['id'] } | null | undefined,
 	) {
-		return Promise.all(clips.map(x => this.pack(x, me)));
+		const _users = clips.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(clips.map(clip => this.pack(clip, me, { packedUser: _userMap.get(clip.userId) })));
 	}
 }
 

packages/backend/src/core/entities/DriveFileEntityService.ts

@@ -222,6 +222,9 @@ export class DriveFileEntityService {
 	public async packNullable(
 		src: MiDriveFile['id'] | MiDriveFile,
 		options?: PackOptions,
+		hint?: {
+			packedUser?: Packed<'UserLite'>
+		},
 	): Promise<Packed<'DriveFile'> | null> {
 		const opts = Object.assign({
 			detail: false,
@@ -249,7 +252,7 @@ export class DriveFileEntityService {
 				detail: true,
 			}) : null,
 			userId: file.userId,
-			user: (opts.withUser && file.userId) ? this.userEntityService.pack(file.userId) : null,
+			user: (opts.withUser && file.userId) ? hint?.packedUser ?? this.userEntityService.pack(file.userId) : null,
 		});
 	}
 
@@ -258,7 +261,10 @@ export class DriveFileEntityService {
 		files: MiDriveFile[],
 		options?: PackOptions,
 	): Promise<Packed<'DriveFile'>[]> {
-		const items = await Promise.all(files.map(f => this.packNullable(f, options)));
+		const _user = files.map(({ user, userId }) => user ?? userId).filter(isNotNull);
+		const _userMap = await this.userEntityService.packMany(_user)
+			.then(users => new Map(users.map(user => [user.id, user])));
+		const items = await Promise.all(files.map(f => this.packNullable(f, options, f.userId ? { packedUser: _userMap.get(f.userId) } : {})));
 		return items.filter(isNotNull);
 	}
 

packages/backend/src/core/entities/FlashEntityService.ts

@@ -33,6 +33,9 @@ export class FlashEntityService {
 	public async pack(
 		src: MiFlash['id'] | MiFlash,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hint?: {
+			packedUser?: Packed<'UserLite'>
+		},
 	): Promise<Packed<'Flash'>> {
 		const meId = me ? me.id : null;
 		const flash = typeof src === 'object' ? src : await this.flashsRepository.findOneByOrFail({ id: src });
@@ -42,7 +45,7 @@ export class FlashEntityService {
 			createdAt: this.idService.parse(flash.id).date.toISOString(),
 			updatedAt: flash.updatedAt.toISOString(),
 			userId: flash.userId,
-			user: this.userEntityService.pack(flash.user ?? flash.userId, me), // { schema: 'UserDetailed' } すると無限ループするので注意
+			user: hint?.packedUser ?? this.userEntityService.pack(flash.user ?? flash.userId, me), // { schema: 'UserDetailed' } すると無限ループするので注意
 			title: flash.title,
 			summary: flash.summary,
 			script: flash.script,
@@ -52,11 +55,14 @@ export class FlashEntityService {
 	}
 
 	@bindThis
-	public packMany(
-		flashs: MiFlash[],
+	public async packMany(
+		flashes: MiFlash[],
 		me?: { id: MiUser['id'] } | null | undefined,
 	) {
-		return Promise.all(flashs.map(x => this.pack(x, me)));
+		const _users = flashes.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(flashes.map(flash => this.pack(flash, me, { packedUser: _userMap.get(flash.userId) })));
 	}
 }
 

packages/backend/src/core/entities/FollowRequestEntityService.ts

@@ -10,6 +10,7 @@ import type { } from '@/models/Blocking.js';
 import type { MiUser } from '@/models/User.js';
 import type { MiFollowRequest } from '@/models/FollowRequest.js';
 import { bindThis } from '@/decorators.js';
+import type { Packed } from '@/misc/json-schema.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -26,14 +27,36 @@ export class FollowRequestEntityService {
 	public async pack(
 		src: MiFollowRequest['id'] | MiFollowRequest,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hint?: {
+			packedFollower?: Packed<'UserLite'>,
+			packedFollowee?: Packed<'UserLite'>,
+		},
 	) {
 		const request = typeof src === 'object' ? src : await this.followRequestsRepository.findOneByOrFail({ id: src });
 
 		return {
 			id: request.id,
-			follower: await this.userEntityService.pack(request.followerId, me),
-			followee: await this.userEntityService.pack(request.followeeId, me),
+			follower: hint?.packedFollower ?? await this.userEntityService.pack(request.followerId, me),
+			followee: hint?.packedFollowee ?? await this.userEntityService.pack(request.followeeId, me),
 		};
 	}
+
+	@bindThis
+	public async packMany(
+		requests: MiFollowRequest[],
+		me?: { id: MiUser['id'] } | null | undefined,
+	) {
+		const _followers = requests.map(({ follower, followerId }) => follower ?? followerId);
+		const _followees = requests.map(({ followee, followeeId }) => followee ?? followeeId);
+		const _userMap = await this.userEntityService.packMany([..._followers, ..._followees], me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(
+			requests.map(req => {
+				const packedFollower = _userMap.get(req.followerId);
+				const packedFollowee = _userMap.get(req.followeeId);
+				return this.pack(req, me, { packedFollower, packedFollowee });
+			}),
+		);
+	}
 }
 

packages/backend/src/core/entities/FollowingEntityService.ts

@@ -78,6 +78,10 @@ export class FollowingEntityService {
 			populateFollowee?: boolean;
 			populateFollower?: boolean;
 		},
+		hint?: {
+			packedFollowee?: Packed<'UserDetailedNotMe'>,
+			packedFollower?: Packed<'UserDetailedNotMe'>,
+		},
 	): Promise<Packed<'Following'>> {
 		const following = typeof src === 'object' ? src : await this.followingsRepository.findOneByOrFail({ id: src });
 
@@ -88,25 +92,35 @@ export class FollowingEntityService {
 			createdAt: this.idService.parse(following.id).date.toISOString(),
 			followeeId: following.followeeId,
 			followerId: following.followerId,
-			followee: opts.populateFollowee ? this.userEntityService.pack(following.followee ?? following.followeeId, me, {
+			followee: opts.populateFollowee ? hint?.packedFollowee ?? this.userEntityService.pack(following.followee ?? following.followeeId, me, {
 				schema: 'UserDetailedNotMe',
 			}) : undefined,
-			follower: opts.populateFollower ? this.userEntityService.pack(following.follower ?? following.followerId, me, {
+			follower: opts.populateFollower ? hint?.packedFollower ?? this.userEntityService.pack(following.follower ?? following.followerId, me, {
 				schema: 'UserDetailedNotMe',
 			}) : undefined,
 		});
 	}
 
 	@bindThis
-	public packMany(
-		followings: any[],
+	public async packMany(
+		followings: MiFollowing[],
 		me?: { id: MiUser['id'] } | null | undefined,
 		opts?: {
 			populateFollowee?: boolean;
 			populateFollower?: boolean;
 		},
 	) {
-		return Promise.all(followings.map(x => this.pack(x, me, opts)));
+		const _followees = opts?.populateFollowee ? followings.map(({ followee, followeeId }) => followee ?? followeeId) : [];
+		const _followers = opts?.populateFollower ? followings.map(({ follower, followerId }) => follower ?? followerId) : [];
+		const _userMap = await this.userEntityService.packMany([..._followees, ..._followers], me, { schema: 'UserDetailedNotMe' })
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(
+			followings.map(following => {
+				const packedFollowee = opts?.populateFollowee ? _userMap.get(following.followeeId) : undefined;
+				const packedFollower = opts?.populateFollower ? _userMap.get(following.followerId) : undefined;
+				return this.pack(following, me, opts, { packedFollowee, packedFollower });
+			}),
+		);
 	}
 }
 

packages/backend/src/core/entities/GalleryPostEntityService.ts

@@ -35,6 +35,9 @@ export class GalleryPostEntityService {
 	public async pack(
 		src: MiGalleryPost['id'] | MiGalleryPost,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hint?: {
+			packedUser?: Packed<'UserLite'>
+		},
 	): Promise<Packed<'GalleryPost'>> {
 		const meId = me ? me.id : null;
 		const post = typeof src === 'object' ? src : await this.galleryPostsRepository.findOneByOrFail({ id: src });
@@ -44,7 +47,7 @@ export class GalleryPostEntityService {
 			createdAt: this.idService.parse(post.id).date.toISOString(),
 			updatedAt: post.updatedAt.toISOString(),
 			userId: post.userId,
-			user: this.userEntityService.pack(post.user ?? post.userId, me),
+			user: hint?.packedUser ?? this.userEntityService.pack(post.user ?? post.userId, me),
 			title: post.title,
 			description: post.description,
 			fileIds: post.fileIds,
@@ -58,11 +61,14 @@ export class GalleryPostEntityService {
 	}
 
 	@bindThis
-	public packMany(
+	public async packMany(
 		posts: MiGalleryPost[],
 		me?: { id: MiUser['id'] } | null | undefined,
 	) {
-		return Promise.all(posts.map(x => this.pack(x, me)));
+		const _users = posts.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(posts.map(post => this.pack(post, me, { packedUser: _userMap.get(post.userId) })));
 	}
 }
 

packages/backend/src/core/entities/InviteCodeEntityService.ts

@@ -12,6 +12,7 @@ import type { MiUser } from '@/models/User.js';
 import type { MiRegistrationTicket } from '@/models/RegistrationTicket.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
+import { isNotNull } from '@/misc/is-not-null.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -29,6 +30,10 @@ export class InviteCodeEntityService {
 	public async pack(
 		src: MiRegistrationTicket['id'] | MiRegistrationTicket,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hints?: {
+			packedCreatedBy?: Packed<'UserLite'>,
+			packedUsedBy?: Packed<'UserLite'>,
+		},
 	): Promise<Packed<'InviteCode'>> {
 		const target = typeof src === 'object' ? src : await this.registrationTicketsRepository.findOneOrFail({
 			where: {
@@ -42,18 +47,28 @@ export class InviteCodeEntityService {
 			code: target.code,
 			expiresAt: target.expiresAt ? target.expiresAt.toISOString() : null,
 			createdAt: this.idService.parse(target.id).date.toISOString(),
-			createdBy: target.createdBy ? await this.userEntityService.pack(target.createdBy, me) : null,
-			usedBy: target.usedBy ? await this.userEntityService.pack(target.usedBy, me) : null,
+			createdBy: target.createdBy ? hints?.packedCreatedBy ?? await this.userEntityService.pack(target.createdBy, me) : null,
+			usedBy: target.usedBy ? hints?.packedUsedBy ?? await this.userEntityService.pack(target.usedBy, me) : null,
 			usedAt: target.usedAt ? target.usedAt.toISOString() : null,
 			used: !!target.usedAt,
 		});
 	}
 
 	@bindThis
-	public packMany(
-		targets: any[],
+	public async packMany(
+		tickets: MiRegistrationTicket[],
 		me: { id: MiUser['id'] },
 	) {
-		return Promise.all(targets.map(x => this.pack(x, me)));
+		const _createdBys = tickets.map(({ createdBy, createdById }) => createdBy ?? createdById).filter(isNotNull);
+		const _usedBys = tickets.map(({ usedBy, usedById }) => usedBy ?? usedById).filter(isNotNull);
+		const _userMap = await this.userEntityService.packMany([..._createdBys, ..._usedBys], me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(
+			tickets.map(ticket => {
+				const packedCreatedBy = ticket.createdById != null ? _userMap.get(ticket.createdById) : undefined;
+				const packedUsedBy = ticket.usedById != null ? _userMap.get(ticket.usedById) : undefined;
+				return this.pack(ticket, me, { packedCreatedBy, packedUsedBy });
+			}),
+		);
 	}
 }

packages/backend/src/core/entities/ModerationLogEntityService.ts

@@ -8,9 +8,10 @@ import { DI } from '@/di-symbols.js';
 import type { ModerationLogsRepository } from '@/models/_.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { } from '@/models/Blocking.js';
-import type { MiModerationLog } from '@/models/ModerationLog.js';
+import { MiModerationLog } from '@/models/ModerationLog.js';
 import { bindThis } from '@/decorators.js';
 import { IdService } from '@/core/IdService.js';
+import type { Packed } from '@/misc/json-schema.js';
 import { UserEntityService } from './UserEntityService.js';
 
 @Injectable()
@@ -27,6 +28,9 @@ export class ModerationLogEntityService {
 	@bindThis
 	public async pack(
 		src: MiModerationLog['id'] | MiModerationLog,
+		hint?: {
+			packedUser?: Packed<'UserDetailedNotMe'>,
+		},
 	) {
 		const log = typeof src === 'object' ? src : await this.moderationLogsRepository.findOneByOrFail({ id: src });
 
@@ -36,17 +40,20 @@ export class ModerationLogEntityService {
 			type: log.type,
 			info: log.info,
 			userId: log.userId,
-			user: this.userEntityService.pack(log.user ?? log.userId, null, {
+			user: hint?.packedUser ?? this.userEntityService.pack(log.user ?? log.userId, null, {
 				schema: 'UserDetailedNotMe',
 			}),
 		});
 	}
 
 	@bindThis
-	public packMany(
-		reports: any[],
+	public async packMany(
+		reports: MiModerationLog[],
 	) {
-		return Promise.all(reports.map(x => this.pack(x)));
+		const _users = reports.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users, null, { schema: 'UserDetailedNotMe' })
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(reports.map(report => this.pack(report, { packedUser: _userMap.get(report.userId) })));
 	}
 }
 

packages/backend/src/core/entities/MutingEntityService.ts

@@ -30,6 +30,9 @@ export class MutingEntityService {
 	public async pack(
 		src: MiMuting['id'] | MiMuting,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hints?: {
+			packedMutee?: Packed<'UserDetailedNotMe'>,
+		},
 	): Promise<Packed<'Muting'>> {
 		const muting = typeof src === 'object' ? src : await this.mutingsRepository.findOneByOrFail({ id: src });
 
@@ -38,18 +41,21 @@ export class MutingEntityService {
 			createdAt: this.idService.parse(muting.id).date.toISOString(),
 			expiresAt: muting.expiresAt ? muting.expiresAt.toISOString() : null,
 			muteeId: muting.muteeId,
-			mutee: this.userEntityService.pack(muting.muteeId, me, {
+			mutee: hints?.packedMutee ?? this.userEntityService.pack(muting.muteeId, me, {
 				schema: 'UserDetailedNotMe',
 			}),
 		});
 	}
 
 	@bindThis
-	public packMany(
-		mutings: any[],
+	public async packMany(
+		mutings: MiMuting[],
 		me: { id: MiUser['id'] },
 	) {
-		return Promise.all(mutings.map(x => this.pack(x, me)));
+		const _mutees = mutings.map(({ mutee, muteeId }) => mutee ?? muteeId);
+		const _userMap = await this.userEntityService.packMany(_mutees, me, { schema: 'UserDetailedNotMe' })
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(mutings.map(muting => this.pack(muting, me, { packedMutee: _userMap.get(muting.muteeId) })));
 	}
 }
 

packages/backend/src/core/entities/NoteEntityService.ts

@@ -290,6 +290,7 @@ export class NoteEntityService implements OnModuleInit {
 			_hint_?: {
 				myReactions: Map<MiNote['id'], string | null>;
 				packedFiles: Map<MiNote['fileIds'][number], Packed<'DriveFile'> | null>;
+				packedUsers: Map<MiUser['id'], Packed<'UserLite'>>
 			};
 		},
 	): Promise<Packed<'Note'>> {
@@ -319,12 +320,13 @@ export class NoteEntityService implements OnModuleInit {
 			.filter(x => x.startsWith(':') && x.includes('@') && !x.includes('@.')) // リモートカスタム絵文字のみ
 			.map(x => this.reactionService.decodeReaction(x).reaction.replaceAll(':', ''));
 		const packedFiles = options?._hint_?.packedFiles;
+		const packedUsers = options?._hint_?.packedUsers;
 
 		const packed: Packed<'Note'> = await awaitAll({
 			id: note.id,
 			createdAt: this.idService.parse(note.id).date.toISOString(),
 			userId: note.userId,
-			user: this.userEntityService.pack(note.user ?? note.userId, me),
+			user: packedUsers?.get(note.userId) ?? this.userEntityService.pack(note.user ?? note.userId, me),
 			text: text,
 			cw: note.cw,
 			visibility: note.visibility,
@@ -449,12 +451,20 @@ export class NoteEntityService implements OnModuleInit {
 		// TODO: 本当は renote とか reply がないのに renoteId とか replyId があったらここで解決しておく
 		const fileIds = notes.map(n => [n.fileIds, n.renote?.fileIds, n.reply?.fileIds]).flat(2).filter(isNotNull);
 		const packedFiles = fileIds.length > 0 ? await this.driveFileEntityService.packManyByIdsMap(fileIds) : new Map();
+		const users = [
+			...notes.map(({ user, userId }) => user ?? userId),
+			...notes.map(({ replyUserId }) => replyUserId).filter(isNotNull),
+			...notes.map(({ renoteUserId }) => renoteUserId).filter(isNotNull),
+		];
+		const packedUsers = await this.userEntityService.packMany(users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
 
 		return await Promise.all(notes.map(n => this.pack(n, me, {
 			...options,
 			_hint_: {
 				myReactions: myReactionsMap,
 				packedFiles,
+				packedUsers,
 			},
 		})));
 	}

packages/backend/src/core/entities/NoteReactionEntityService.ts

@@ -52,6 +52,9 @@ export class NoteReactionEntityService implements OnModuleInit {
 		options?: {
 			withNote: boolean;
 		},
+		hints?: {
+			packedUser?: Packed<'UserLite'>
+		},
 	): Promise<Packed<'NoteReaction'>> {
 		const opts = Object.assign({
 			withNote: false,
@@ -62,7 +65,7 @@ export class NoteReactionEntityService implements OnModuleInit {
 		return {
 			id: reaction.id,
 			createdAt: this.idService.parse(reaction.id).date.toISOString(),
-			user: await this.userEntityService.pack(reaction.user ?? reaction.userId, me),
+			user: hints?.packedUser ?? await this.userEntityService.pack(reaction.user ?? reaction.userId, me),
 			type: this.reactionService.convertLegacyReaction(reaction.reaction),
 			...(opts.withNote ? {
 				note: await this.noteEntityService.pack(reaction.note ?? reaction.noteId, me),
@@ -81,7 +84,9 @@ export class NoteReactionEntityService implements OnModuleInit {
 		const opts = Object.assign({
 			withNote: false,
 		}, options);
-
-		return Promise.all(reactions.map(reaction => this.pack(reaction, me, opts)));
+		const _users = reactions.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(reactions.map(reaction => this.pack(reaction, me, opts, { packedUser: _userMap.get(reaction.userId) })));
 	}
 }

packages/backend/src/core/entities/PageEntityService.ts

@@ -40,6 +40,9 @@ export class PageEntityService {
 	public async pack(
 		src: MiPage['id'] | MiPage,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hint?: {
+			packedUser?: Packed<'UserLite'>
+		},
 	): Promise<Packed<'Page'>> {
 		const meId = me ? me.id : null;
 		const page = typeof src === 'object' ? src : await this.pagesRepository.findOneByOrFail({ id: src });
@@ -91,7 +94,7 @@ export class PageEntityService {
 			createdAt: this.idService.parse(page.id).date.toISOString(),
 			updatedAt: page.updatedAt.toISOString(),
 			userId: page.userId,
-			user: this.userEntityService.pack(page.user ?? page.userId, me), // { schema: 'UserDetailed' } すると無限ループするので注意
+			user: hint?.packedUser ?? this.userEntityService.pack(page.user ?? page.userId, me), // { schema: 'UserDetailed' } すると無限ループするので注意
 			content: page.content,
 			variables: page.variables,
 			title: page.title,
@@ -110,11 +113,14 @@ export class PageEntityService {
 	}
 
 	@bindThis
-	public packMany(
+	public async packMany(
 		pages: MiPage[],
 		me?: { id: MiUser['id'] } | null | undefined,
 	) {
-		return Promise.all(pages.map(x => this.pack(x, me)));
+		const _users = pages.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(pages.map(page => this.pack(page, me, { packedUser: _userMap.get(page.userId) })));
 	}
 }
 

packages/backend/src/core/entities/RenoteMutingEntityService.ts

@@ -30,6 +30,9 @@ export class RenoteMutingEntityService {
 	public async pack(
 		src: MiRenoteMuting['id'] | MiRenoteMuting,
 		me?: { id: MiUser['id'] } | null | undefined,
+		hints?: {
+			packedMutee?: Packed<'UserDetailedNotMe'>
+		},
 	): Promise<Packed<'RenoteMuting'>> {
 		const muting = typeof src === 'object' ? src : await this.renoteMutingsRepository.findOneByOrFail({ id: src });
 
@@ -37,18 +40,21 @@ export class RenoteMutingEntityService {
 			id: muting.id,
 			createdAt: this.idService.parse(muting.id).date.toISOString(),
 			muteeId: muting.muteeId,
-			mutee: this.userEntityService.pack(muting.muteeId, me, {
+			mutee: hints?.packedMutee ?? this.userEntityService.pack(muting.muteeId, me, {
 				schema: 'UserDetailedNotMe',
 			}),
 		});
 	}
 
 	@bindThis
-	public packMany(
-		mutings: any[],
+	public async packMany(
+		mutings: MiRenoteMuting[],
 		me: { id: MiUser['id'] },
 	) {
-		return Promise.all(mutings.map(x => this.pack(x, me)));
+		const _users = mutings.map(({ mutee, muteeId }) => mutee ?? muteeId);
+		const _userMap = await this.userEntityService.packMany(_users, me, { schema: 'UserDetailedNotMe' })
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(mutings.map(muting => this.pack(muting, me, { packedMutee: _userMap.get(muting.muteeId) })));
 	}
 }
 

packages/backend/src/core/entities/ReversiGameEntityService.ts

@@ -28,13 +28,15 @@ export class ReversiGameEntityService {
 	@bindThis
 	public async packDetail(
 		src: MiReversiGame['id'] | MiReversiGame,
+		hint?: {
+			packedUser1?: Packed<'UserLite'>,
+			packedUser2?: Packed<'UserLite'>,
+		},
 	): Promise<Packed<'ReversiGameDetailed'>> {
 		const game = typeof src === 'object' ? src : await this.reversiGamesRepository.findOneByOrFail({ id: src });
 
-		const users = await Promise.all([
-			this.userEntityService.pack(game.user1 ?? game.user1Id),
-			this.userEntityService.pack(game.user2 ?? game.user2Id),
-		]);
+		const user1 = hint?.packedUser1 ?? await this.userEntityService.pack(game.user1 ?? game.user1Id);
+		const user2 = hint?.packedUser2 ?? await this.userEntityService.pack(game.user2 ?? game.user2Id);
 
 		return await awaitAll({
 			id: game.id,
@@ -49,10 +51,10 @@ export class ReversiGameEntityService {
 			user2Ready: game.user2Ready,
 			user1Id: game.user1Id,
 			user2Id: game.user2Id,
-			user1: users[0],
-			user2: users[1],
+			user1,
+			user2,
 			winnerId: game.winnerId,
-			winner: game.winnerId ? users.find(u => u.id === game.winnerId)! : null,
+			winner: game.winnerId ? [user1, user2].find(u => u.id === game.winnerId)! : null,
 			surrenderedUserId: game.surrenderedUserId,
 			timeoutUserId: game.timeoutUserId,
 			black: game.black,
@@ -68,22 +70,35 @@ export class ReversiGameEntityService {
 	}
 
 	@bindThis
-	public packDetailMany(
-		xs: MiReversiGame[],
+	public async packDetailMany(
+		games: MiReversiGame[],
 	) {
-		return Promise.all(xs.map(x => this.packDetail(x)));
+		const _user1s = games.map(({ user1, user1Id }) => user1 ?? user1Id);
+		const _user2s = games.map(({ user2, user2Id }) => user2 ?? user2Id);
+		const _userMap = await this.userEntityService.packMany([..._user1s, ..._user2s])
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(
+			games.map(game => {
+				return this.packDetail(game, {
+					packedUser1: _userMap.get(game.user1Id),
+					packedUser2: _userMap.get(game.user2Id),
+				});
+			}),
+		);
 	}
 
 	@bindThis
 	public async packLite(
 		src: MiReversiGame['id'] | MiReversiGame,
+		hint?: {
+			packedUser1?: Packed<'UserLite'>,
+			packedUser2?: Packed<'UserLite'>,
+		},
 	): Promise<Packed<'ReversiGameLite'>> {
 		const game = typeof src === 'object' ? src : await this.reversiGamesRepository.findOneByOrFail({ id: src });
 
-		const users = await Promise.all([
-			this.userEntityService.pack(game.user1 ?? game.user1Id),
-			this.userEntityService.pack(game.user2 ?? game.user2Id),
-		]);
+		const user1 = hint?.packedUser1 ?? await this.userEntityService.pack(game.user1 ?? game.user1Id);
+		const user2 = hint?.packedUser2 ?? await this.userEntityService.pack(game.user2 ?? game.user2Id);
 
 		return await awaitAll({
 			id: game.id,
@@ -94,10 +109,10 @@ export class ReversiGameEntityService {
 			isEnded: game.isEnded,
 			user1Id: game.user1Id,
 			user2Id: game.user2Id,
-			user1: users[0],
-			user2: users[1],
+			user1,
+			user2,
 			winnerId: game.winnerId,
-			winner: game.winnerId ? users.find(u => u.id === game.winnerId)! : null,
+			winner: game.winnerId ? [user1, user2].find(u => u.id === game.winnerId)! : null,
 			surrenderedUserId: game.surrenderedUserId,
 			timeoutUserId: game.timeoutUserId,
 			black: game.black,
@@ -111,10 +126,21 @@ export class ReversiGameEntityService {
 	}
 
 	@bindThis
-	public packLiteMany(
-		xs: MiReversiGame[],
+	public async packLiteMany(
+		games: MiReversiGame[],
 	) {
-		return Promise.all(xs.map(x => this.packLite(x)));
+		const _user1s = games.map(({ user1, user1Id }) => user1 ?? user1Id);
+		const _user2s = games.map(({ user2, user2Id }) => user2 ?? user2Id);
+		const _userMap = await this.userEntityService.packMany([..._user1s, ..._user2s])
+			.then(users => new Map(users.map(u => [u.id, u])));
+		return Promise.all(
+			games.map(game => {
+				return this.packLite(game, {
+					packedUser1: _userMap.get(game.user1Id),
+					packedUser2: _userMap.get(game.user2Id),
+				});
+			}),
+		);
 	}
 }
 

packages/backend/src/core/entities/UserListEntityService.ts

@@ -50,11 +50,14 @@ export class UserListEntityService {
 	public async packMembershipsMany(
 		memberships: MiUserListMembership[],
 	) {
+		const _users = memberships.map(({ user, userId }) => user ?? userId);
+		const _userMap = await this.userEntityService.packMany(_users)
+			.then(users => new Map(users.map(u => [u.id, u])));
 		return Promise.all(memberships.map(async x => ({
 			id: x.id,
 			createdAt: this.idService.parse(x.id).date.toISOString(),
 			userId: x.userId,
-			user: await this.userEntityService.pack(x.userId),
+			user: _userMap.get(x.userId) ?? await this.userEntityService.pack(x.userId),
 			withReplies: x.withReplies,
 		})));
 	}

packages/backend/src/server/api/endpoints/admin/roles/users.ts

@@ -89,10 +89,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				.limit(ps.limit)
 				.getMany();
 
+			const _users = assigns.map(({ user, userId }) => user ?? userId);
+			const _userMap = await this.userEntityService.packMany(_users, me, { schema: 'UserDetailed' })
+				.then(users => new Map(users.map(u => [u.id, u])));
 			return await Promise.all(assigns.map(async assign => ({
 				id: assign.id,
 				createdAt: this.idService.parse(assign.id).date.toISOString(),
-				user: await this.userEntityService.pack(assign.user!, me, { schema: 'UserDetailed' }),
+				user: _userMap.get(assign.userId) ?? await this.userEntityService.pack(assign.user!, me, { schema: 'UserDetailed' }),
 				expiresAt: assign.expiresAt?.toISOString() ?? null,
 			})));
 		});

packages/backend/src/server/api/endpoints/drive/files/find.ts

@@ -54,7 +54,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				folderId: ps.folderId ?? IsNull(),
 			});
 
-			return await Promise.all(files.map(file => this.driveFileEntityService.pack(file, { self: true })));
+			return await this.driveFileEntityService.packMany(files, { self: true });
 		});
 	}
 }

packages/backend/src/server/api/endpoints/following/requests/list.ts

@@ -71,7 +71,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				.limit(ps.limit)
 				.getMany();
 
-			return await Promise.all(requests.map(req => this.followRequestEntityService.pack(req)));
+			return await this.followRequestEntityService.packMany(requests, me);
 		});
 	}
 }

packages/backend/src/server/api/endpoints/notes/reactions.ts

@@ -76,7 +76,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			const reactions = await query.limit(ps.limit).getMany();
 
-			return await Promise.all(reactions.map(reaction => this.noteReactionEntityService.pack(reaction, me)));
+			return await this.noteReactionEntityService.packMany(reactions, me);
 		});
 	}
 }

packages/backend/src/server/api/endpoints/roles/users.ts

@@ -92,9 +92,12 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				.limit(ps.limit)
 				.getMany();
 
+			const _users = assigns.map(({ user, userId }) => user ?? userId);
+			const _userMap = await this.userEntityService.packMany(_users, me, { schema: 'UserDetailed' })
+				.then(users => new Map(users.map(u => [u.id, u])));
 			return await Promise.all(assigns.map(async assign => ({
 				id: assign.id,
-				user: await this.userEntityService.pack(assign.user!, me, { schema: 'UserDetailed' }),
+				user: _userMap.get(assign.userId) ?? await this.userEntityService.pack(assign.user!, me, { schema: 'UserDetailed' }),
 			})));
 		});
 	}

packages/backend/src/server/api/endpoints/users/get-frequently-replied-users.ts

@@ -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;

packages/backend/src/server/api/endpoints/users/show.ts

@@ -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') {