Обновил модель RecommendationPlaylist, исправил IndexView и изменил вид админки Playlist

music_storage/music/models.py

@@ -101,7 +101,7 @@ class RecommendationPlaylist(BaseModel):
 
     name = models.CharField(max_length=200)
     description = models.TextField(blank=True)
-    playlist = models.ForeignKey(
+    playlist = models.OneToOneField(
         Playlist, on_delete=models.CASCADE, related_name="recommendations"
     )
     is_actual = models.BooleanField(default=False)