disable /register if a user exist

repositories/userRepository.go

@@ -1,15 +1,16 @@
 package repositories
 
-import(
+import (
 	"gorm.io/gorm"
 
 	"git.dynamicdiscord.de/kalipso/zineshop/models"
-)	
+)
 
 type UserRepository interface {
-	Create(models.User) (models.User, error)	
+	Create(models.User) (models.User, error)
 	GetByEmail(string) (models.User, error)
 	GetById(interface{}) (models.User, error)
+	IsEmpty() (bool, error)
 }
 
 type GORMUserRepository struct {
@@ -22,7 +23,7 @@ func NewGORMUserRepository(db *gorm.DB) UserRepository {
 	}
 }
 
-func (u *GORMUserRepository) Create(user models.User) (models.User, error)	{
+func (u *GORMUserRepository) Create(user models.User) (models.User, error) {
 	result := u.DB.Create(&user)
 
 	if result.Error != nil {
@@ -53,3 +54,18 @@ func (u *GORMUserRepository) GetById(id interface{}) (models.User, error) {
 
 	return user, nil
 }
+
+func (u *GORMUserRepository) IsEmpty() (bool, error) {
+	var user models.User
+	result := u.DB.First(&user)
+
+	if result.Error != nil {
+		if result.Error == gorm.ErrRecordNotFound {
+			return true, nil
+		} else {
+			return false, result.Error
+		}
+	}
+
+	return false, nil
+}