Service Layer

Author: zumardirahman

book/repository.go

@@ -4,7 +4,7 @@ import "gorm.io/gorm"
 
 type Repository interface {
 	FindAll() ([]Book, error)
-	FindByID(ID int) ([]Book, error)
+	FindByID(ID int) (Book, error)
 	Create(book Book) (Book, error)
 }
 

book/input.go book/request.gobook/input.go renamed to book/request.go

@@ -2,7 +2,7 @@ package book
 
 import "encoding/json"
 
-type BookInput struct {
+type BookRequest struct {
 	Title    string      `json:"title" binding:"required"`
 	Price    json.Number `json:"price" binding:"required,number"`
 	SubTitle string      `json:"sub_title" binding:"required"`

book/service.go

@@ -0,0 +1,37 @@
+package book
+
+type Service interface {
+	FindAll() ([]Book, error)
+	FindByID(ID int) (Book, error)
+	Create(bookRequest BookRequest) (Book, error)
+}
+
+type service struct {
+	repository Repository
+}
+
+func NewService(repository Repository) *service {
+	return &service{repository}
+}
+
+func (s *service) FindAll() ([]Book, error) {
+	books, err := s.repository.FindAll()
+	return books, err
+	// return s.repository.FindAll()
+}
+
+func (s *service) FindByID(ID int) (Book, error) {
+	book, err := s.repository.FindByID(ID)
+	return book, err
+}
+
+func (s *service) Create(bookRequest BookRequest) (Book, error) {
+	price, _ := bookRequest.Price.Int64()
+	book := Book{
+		Title: bookRequest.Title,
+		Price: int(price),
+	}
+
+	newBook, err := s.repository.Create(book)
+	return newBook, err
+}

handler/book.go

@@ -43,7 +43,7 @@ func QueryHandler(c *gin.Context) {
 }
 
 func PostBooksHandler(c *gin.Context) {
-	var bookInput book.BookInput
+	var bookInput book.BookRequest
 
 	err := c.ShouldBindJSON(&bookInput)
 	if err != nil {

main.go

@@ -26,6 +26,7 @@ func main() {
 	db.AutoMigrate(&book.Book{})
 
 	bookRepository := book.NewRepository(db)
+	bookService := book.NewService(bookRepository)
 
 	// books, err := bookRepository.FindAll()
 
@@ -37,15 +38,22 @@ func main() {
 
 	// fmt.Println("Title:", book.Title)
 
-	book := book.Book{
-		Title:       "One Hundred Dolar",
-		Description: "Buku Terpopular",
-		Price:       890000,
-		Rating:      5,
-		Discount:    2,
+	// book := book.Book{
+	// 	Title:       "One Hundred Dolar",
+	// 	Description: "Buku Terpopular",
+	// 	Price:       890000,
+	// 	Rating:      5,
+	// 	Discount:    2,
+	// }
+
+	bookRequest := book.BookRequest{
+		Title: "Manusia Super",
+		Price: "45000",
 	}
 
-	bookRepository.Create(book)
+	// bookRepository.Create(book)
+
+	bookService.Create(bookRequest)
 
 	//CRUD
 
@@ -124,7 +132,8 @@ func v2RootHandler(c *gin.Context) {
 //Layer GO
 //
 //1. Main
-//2. Service
-//3. Repository
-//4. DB
-//5. MySql
+//2. Handler
+//3. Service
+//4. Repository
+//5. DB
+//6. MySql