Show error message if not using addressable value for auto migration

main.go

@@ -363,7 +363,7 @@ func (s *DB) HasTable(value interface{}) bool {
 func (s *DB) AutoMigrate(values ...interface{}) *DB {
 	db := s.clone()
 	for _, value := range values {
-		db = db.NewScope(value).autoMigrate().db
+		db = db.NewScope(value).NeedPtr().autoMigrate().db
 	}
 	return db
 }

scope.go

@@ -34,14 +34,20 @@ func (scope *Scope) IndirectValue() reflect.Value {
 
 // NewScope create scope for callbacks, including DB's search information
 func (db *DB) NewScope(value interface{}) *Scope {
-	// reflectKind := reflect.ValueOf(value).Kind()
-	// if !((reflectKind == reflect.Invalid) || (reflectKind == reflect.Ptr)) {
-	// 	fmt.Printf("%v %v\n", fileWithLineNum(), "using unaddressable value")
-	// }
 	db.Value = value
 	return &Scope{db: db, Search: db.search, Value: value}
 }
 
+func (scope *Scope) NeedPtr() *Scope {
+	reflectKind := reflect.ValueOf(scope.Value).Kind()
+	if !((reflectKind == reflect.Invalid) || (reflectKind == reflect.Ptr)) {
+		err := errors.New(fmt.Sprintf("%v %v\n", fileWithLineNum(), "using unaddressable value"))
+		scope.Err(err)
+		fmt.Printf(err.Error())
+	}
+	return scope
+}
+
 // New create a new Scope without search information
 func (scope *Scope) New(value interface{}) *Scope {
 	return &Scope{db: scope.db, Search: &search{}, Value: value}