fix: init data 형식 수정

backend/chatServer/src/room/room.repository.ts

@@ -39,19 +39,24 @@ export class RoomRepository {
 
   private async lindex<T>(key: string, index: number){
     const result = await this.redisClient.lindex(key, index);
-    if(result) return JSON.parse(result) as T;
-    return undefined;
+    if(!result) return undefined;
+
+    const l = typeof result === 'string' ? result : JSON.parse(result);
+    return l as T;
   }
 
   private async lrange<T>(key: string, start: number, end: number){
     const result = await this.redisClient.lrange(key, start, end);
-    return result as T;
+    if(!result) return undefined;
+    const arrayT = result.map((r) => typeof r === 'string' ? r : JSON.parse(r));
+    return arrayT as T;
   }
 
   private async getData<T>(key: string) {
     const result = await this.redisClient.get(key);
-    if(result) return typeof result === 'string' ? result as T : JSON.parse(result) as T;
-    return undefined;
+    if(!result) return undefined;
+    const data = result === 'string' ? result : JSON.parse(result);
+    return data as T;
   }
 
   async isRoomExisted(roomId: string) {