Convert internal disc number representation to int

model/album.go

@@ -1,7 +1,6 @@
 package model
 
 import (
-	"strconv"
 	"time"
 
 	"github.com/navidrome/navidrome/utils/slice"
@@ -62,13 +61,14 @@ func (a Album) CoverArtID() ArtworkID {
 	return artworkIDFromAlbum(a)
 }
 
-type Discs map[string]string
+type Discs map[int]string
 
+// Add adds a disc to the Discs map. If the map is nil, it is initialized.
 func (d *Discs) Add(discNumber int, discSubtitle string) {
 	if *d == nil {
 		*d = Discs{}
 	}
-	(*d)[strconv.Itoa(discNumber)] = discSubtitle
+	(*d)[discNumber] = discSubtitle
 }
 
 type DiscID struct {

model/mediafile_test.go

@@ -139,7 +139,7 @@ var _ = Describe("MediaFiles", func() {
 				})
 				It("sets the correct Discs", func() {
 					album := mfs.ToAlbum()
-					Expect(album.Discs).To(Equal(Discs{"1": "DiscSubtitle"}))
+					Expect(album.Discs).To(Equal(Discs{1: "DiscSubtitle"}))
 				})
 			})
 			When("we have multiple discs", func() {
@@ -148,7 +148,7 @@ var _ = Describe("MediaFiles", func() {
 				})
 				It("sets the correct Discs", func() {
 					album := mfs.ToAlbum()
-					Expect(album.Discs).To(Equal(Discs{"1": "DiscSubtitle", "2": "DiscSubtitle2"}))
+					Expect(album.Discs).To(Equal(Discs{1: "DiscSubtitle", 2: "DiscSubtitle2"}))
 				})
 			})
 		})