Fix bug in unique tracks on different albums

vrobbler/apps/music/migrations/0009_alter_track_musicbrainz_id_and_more.py

@@ -0,0 +1,22 @@
+# Generated by Django 4.1.5 on 2023-01-19 20:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('music', '0008_alter_track_options'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='track',
+            name='musicbrainz_id',
+            field=models.CharField(blank=True, max_length=255, null=True),
+        ),
+        migrations.AlterUniqueTogether(
+            name='track',
+            unique_together={('album', 'musicbrainz_id')},
+        ),
+    ]

vrobbler/apps/music/models.py

@@ -103,7 +103,10 @@ class Track(ScrobblableMixin):
 
     artist = models.ForeignKey(Artist, on_delete=models.DO_NOTHING)
     album = models.ForeignKey(Album, on_delete=models.DO_NOTHING, **BNULL)
-    musicbrainz_id = models.CharField(max_length=255, unique=True, **BNULL)
+    musicbrainz_id = models.CharField(max_length=255, **BNULL)
+
+    class Meta:
+        unique_together = [['album', 'musicbrainz_id']]
 
     def __str__(self):
         return f"{self.title} by {self.artist}"