SQL/Orm ArtistRepository complete

persistence/persistence.go

@@ -1,3 +1,16 @@
 package persistence
 
+import "reflect"
+
 type ProviderIdentifier string
+
+func CollectValue(collection interface{}, getValue func(item interface{}) string) []string {
+	s := reflect.ValueOf(collection)
+	result := make([]string, s.Len())
+
+	for i := 0; i < s.Len(); i++ {
+		result[i] = getValue(s.Index(i).Interface())
+	}
+
+	return result
+}