perf(api): batch leaderboard stat lookups

apps/api/src/guild/leaderboards/guild-leaderboard.service.ts

@@ -55,23 +55,22 @@ export class GuildLeaderboardService extends LeaderboardService {
       return acc;
     }, {} as Record<string, boolean>);
 
+    selector.id = true;
     selector.nameFormatted = true;
 
-    return await Promise.all(
-      ids.map(async (id) => {
-        const guild = await this.guildModel
-          .findOne()
-          .where("id")
-          .equals(id)
-          .select(selector)
-          .lean()
-          .exec();
+    const guilds = await this.guildModel
+      .find({ id: { $in: ids } })
+      .select(selector)
+      .lean()
+      .exec();
 
-        const additionalStats = flatten(guild) as LeaderboardAdditionalStats;
-        additionalStats.name = additionalStats.nameFormatted;
+    const guildsById = new Map(guilds.map((guild) => [guild.id, guild]));
 
-        return additionalStats;
-      })
-    );
+    return ids.map((id) => {
+      const additionalStats = flatten(guildsById.get(id)) as LeaderboardAdditionalStats;
+      additionalStats.name = additionalStats.nameFormatted;
+
+      return additionalStats;
+    });
   }
 }

apps/api/src/player/leaderboards/player-leaderboard.service.ts

@@ -55,22 +55,21 @@ export class PlayerLeaderboardService extends LeaderboardService {
     }, {} as Record<string, boolean>);
 
     selector.displayName = true;
+    selector.uuid = true;
 
-    return await Promise.all(
-      ids.map(async (id) => {
-        const player = await this.playerModel
-          .findOne()
-          .where("uuid")
-          .equals(id)
-          .select(selector)
-          .lean()
-          .exec();
+    const players = await this.playerModel
+      .find({ uuid: { $in: ids } })
+      .select(selector)
+      .lean()
+      .exec();
 
-        const additionalStats = flatten(player) as LeaderboardAdditionalStats;
-        additionalStats.name = additionalStats.displayName;
+    const playersById = new Map(players.map((player) => [player.uuid, player]));
 
-        return additionalStats;
-      })
-    );
+    return ids.map((id) => {
+      const additionalStats = flatten(playersById.get(id)) as LeaderboardAdditionalStats;
+      additionalStats.name = additionalStats.displayName;
+
+      return additionalStats;
+    });
   }
 }