Introduced interfaces for all repositories, completely isolating the persistence layer from the repositories usage and specification

persistence/artist_repository.go

@@ -4,30 +4,30 @@ import (
 	"github.com/deluan/gosonic/domain"
 )
 
-type Artist struct {
-	BaseRepository
+type artistRepository struct {
+	baseRepository
 }
 
-func NewArtistRepository() *Artist {
-	r := &Artist{}
+func NewArtistRepository() domain.ArtistRepository {
+	r := &artistRepository{}
 	r.init("artist", &domain.Artist{})
 	return r
 }
 
-func (r *Artist) Put(m *domain.Artist) error {
+func (r *artistRepository) Put(m *domain.Artist) error {
 	if m.Id == "" {
 		m.Id = r.NewId(m.Name)
 	}
 	return r.saveOrUpdate(m.Id, m)
 }
 
-func (r *Artist) Get(id string) (*domain.Artist, error) {
+func (r *artistRepository) Get(id string) (*domain.Artist, error) {
 	var rec interface{}
 	rec, err := r.readEntity(id)
 	return rec.(*domain.Artist), err
 }
 
-func (r *Artist) GetByName(name string) (*domain.Artist, error) {
+func (r *artistRepository) GetByName(name string) (*domain.Artist, error) {
 	id := r.NewId(name)
 	return r.Get(id)
 }