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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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11
packages/backend/src/core/entities/NoteReactionEntityService.ts
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@@ -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) })));
}
}