add missing models

kontor-gin/internal/service/book.go

@@ -0,0 +1,22 @@
+package service
+
+import (
+	"context"
+	"kontor-api-gin/internal/models"
+	"kontor-api-gin/internal/repository"
+	"log/slog"
+)
+
+type BookService struct {
+	repository *repository.BookRepository
+}
+
+func NewBookService(repo *repository.BookRepository) *BookService {
+	service := &BookService{repository: repo}
+	return service
+}
+
+func (service *BookService) List(context context.Context) ([]models.Book, error) {
+	slog.Info("BookService#List")
+	return service.repository.FindAll(context)
+}