fix: return null for lyrics id if not available

Author: sumitkolhe

src/modules/songs/helpers/song.helper.ts

@@ -15,7 +15,7 @@ export const createSongPayload = (song: z.infer<typeof SongAPIResponseModel>): z
   playCount: Number(song.play_count || 0),
   language: song.language,
   hasLyrics: song.more_info?.has_lyrics === 'true',
-  lyricsId: song.more_info?.lyrics_id ?? null,
+  lyricsId: song.more_info?.lyrics_id || null,
   url: song.perma_url,
   copyright: song.more_info?.copyright_text,
   album: {

src/modules/songs/models/song.model.ts

@@ -69,7 +69,7 @@ export const SongModel = z.object({
   playCount: z.number(),
   language: z.string(),
   hasLyrics: z.boolean(),
-  lyricsId: z.string(),
+  lyricsId: z.string().nullable(),
   lyrics: LyricsModel.optional(),
   url: z.string(),
   copyright: z.string(),

src/modules/songs/use-cases/get-song-by-id/get-song-by-id.use-case.ts

@@ -26,7 +26,7 @@ export class GetSongByIdUseCase implements IUseCase<GetSongByIdArgs, z.infer<typ
 
     if (!response.songs?.length) throw new HTTPException(404, { message: 'song not found' })
 
-    const songs = response.songs.map((element) => createSongPayload(element))
+    const songs = response.songs.map((song) => createSongPayload(song))
 
     if (includeLyrics) {
       await Promise.all(