Сделал Плейлист и добавил рекомендацию на главную страницу

music_storage/music/models.py

@@ -79,3 +79,40 @@ class Track(BaseModel):
 
     def __str__(self):
         return f"{self.album.artist} - {self.title}"
+
+
+class Playlist(BaseModel):
+    name = models.CharField(max_length=200)
+    tracks = models.ManyToManyField(Track, related_name="playlists")
+
+    def __str__(self):
+        return f"Playlist: {self.name}"
+
+
+class RecommendationPlaylist(BaseModel):
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(
+                fields=["is_actual"],
+                condition=models.Q(is_actual=True),
+                name="unique_actual_recommendation_playlist",
+            )
+        ]
+
+    name = models.CharField(max_length=200)
+    description = models.TextField(blank=True)
+    playlist = models.ForeignKey(
+        Playlist, on_delete=models.CASCADE, related_name="recommendations"
+    )
+    is_actual = models.BooleanField(default=False)
+
+    def __str__(self):
+        return f"Recommendation Playlist: {self.name}"
+
+    def switch_actual(self):
+        if not self.is_actual:
+            (RecommendationPlaylist.objects
+                .filter(is_actual=True)
+                .update(is_actual=False))
+            self.is_actual = True
+            self.save()