turns out rewriting all of your database code takes a while

music/model/artist.go

@@ -1,8 +1,10 @@
 package model
 
+import "strings"
+
 type (
 	Artist struct {
-		ID      string  `json:"id"`
+		ID      string `json:"id"`
 		Name    string `json:"name"`
 		Website string `json:"website"`
 		Avatar  string `json:"avatar"`
@@ -14,8 +16,61 @@ func (artist Artist) GetWebsite() string {
 }
 
 func (artist Artist) GetAvatar() string {
-    if artist.Avatar == "" {
-        return "/img/default-avatar.png"
-    }
+	if artist.Avatar == "" {
+		return "/img/default-avatar.png"
+	}
 	return artist.Avatar
 }
+
+func (release FullRelease) GetUniqueArtists(only_primary bool) []*Artist {
+	var artists = []*Artist{}
+
+	for _, credit := range release.Credits {
+		if only_primary && !credit.Primary {
+			continue
+		}
+
+		exists := false
+		for _, a := range artists {
+			if a.ID == credit.Artist.ID {
+				exists = true
+				break
+			}
+		}
+
+		if exists {
+			continue
+		}
+
+		artists = append(artists, &credit.Artist)
+	}
+
+	return artists
+}
+
+func (release FullRelease) GetUniqueArtistNames(only_primary bool) []string {
+	var names = []string{}
+	for _, artist := range release.GetUniqueArtists(only_primary) {
+		names = append(names, artist.Name)
+	}
+
+	return names
+}
+
+func (release FullRelease) PrintArtists(only_primary bool, ampersand bool) string {
+	names := release.GetUniqueArtistNames(only_primary)
+
+	if len(names) == 0 {
+		return "Unknown Artist"
+	} else if len(names) == 1 {
+		return names[0]
+	}
+
+	if ampersand {
+		res := strings.Join(names[:len(names)-1], ", ")
+		res += " & " + names[len(names)-1]
+		return res
+	} else {
+		return strings.Join(names[:], ", ")
+	}
+}