private static function relations()
    {
        $files = ['OneToOne', 'OneToMany', 'ManyToMany', 'BelongsTo'];
        $folder = static::$root.'MVC/Relations'.'/';

        self::call($files, $folder);

        $files = ['ManyRelationException', 'ModelNotFindedException'];
        $folder = static::$root.'MVC/Relations/Exceptions'.'/';

        self::call($files, $folder);
    }