public function exists($column = null, $value = null)
    {
        if ($value == null && $value == null) {
            return $this->count() > 0;
        }

        if ($value == null) {
            $value = $column;

            $column = (new $this->model)->getKey();
        }

        return $this->where($column, $value)->count() > 0;
    }