플레이리스트 정보에 음악 개수, 썸네일 링크 추가

server/src/entity/music_playlist.entity.ts

@@ -77,4 +77,19 @@ export class Music_Playlist extends BaseEntity {
       take: 10,
     }).then((a: Music_Playlist[]) => a.map((b) => b.music));
   }
+
+  static async getMusicCountByPlaylistId(playlist_id: number): Promise<number> {
+    return this.count({ where: { playlist: { playlist_id } } });
+  }
+
+  static async getThumbnailByPlaylistId(
+    playlist_id: number,
+  ): Promise<Music_Playlist> {
+    return this.findOne({
+      relations: { music: true },
+      select: { music: { cover: true } },
+      where: { playlist: { playlist_id } },
+      order: { music_playlist_id: 'DESC' },
+    });
+  }
 }

server/src/music/music.controller.ts

@@ -65,7 +65,7 @@ export class MusicController {
   }
 
   @Get('info')
-  @HttpCode(HTTP_STATUS_CODE.SERVER_ERROR)
+  @HttpCode(HTTP_STATUS_CODE.SUCCESS)
   async getMusicInfo(@Query('music_id') music_id: string): Promise<Music> {
     return this.musicService.getMusicInfo(music_id);
   }

server/src/playlist/playlist.service.ts

@@ -166,7 +166,20 @@ export class PlaylistService {
 
   async getUserPlaylists(userId: string): Promise<Playlist[]> {
     try {
-      return Playlist.getPlaylistsByUserId(userId);
+      const playlists: Playlist[] = await Playlist.getPlaylistsByUserId(userId);
+      const countPromises = playlists.map(async (playlist) => {
+        playlist['music_count'] =
+          await Music_Playlist.getMusicCountByPlaylistId(playlist.playlist_id);
+      });
+      const thumbnailPromises = playlists.map(async (playlist) => {
+        const target = await Music_Playlist.getThumbnailByPlaylistId(
+          playlist.playlist_id,
+        );
+        playlist['thumbnail'] = !target ? null : target.music.cover;
+      });
+      await Promise.all(countPromises);
+      await Promise.all(thumbnailPromises);
+      return playlists;
     } catch {
       throw new CatchyException(
         'SERVER_ERROR',