added validation when adding a book

internal/api/routes.go

@@ -1,10 +1,12 @@
 package api
 
 import (
+	"errors"
 	"net/http"
 
 	"git.artlef.fr/PersonalLibraryManager/internal/model"
 	"github.com/gin-gonic/gin"
+	"github.com/go-playground/validator/v10"
 	"gorm.io/gorm"
 )
 
@@ -18,7 +20,12 @@ func PostBookHandler(c *gin.Context, db *gorm.DB) {
 	var book bookPostCreate
 	err := c.ShouldBindJSON(&book)
 	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		var ve validator.ValidationErrors
+		if errors.As(err, &ve) {
+			c.JSON(http.StatusBadRequest, getValidationErrors(&ve))
+		} else {
+			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		}
 		return
 	}
 	bookDb := book.toBook()