Manage display of book covers

internal/myvalidator/myvalidator.go

@@ -18,6 +18,10 @@ type HttpError struct {
 }
 
 func ValidateId(db *gorm.DB, id uint, value any) error {
+	//id = 0 means empty id, so no check
+	if id == 0 {
+		return nil
+	}
 	record := map[string]any{}
 	result := db.Model(value).First(&record, id)
 	if result.Error == nil {