public function scopeWithToken($query, $flag = true)
    {
        if (! isset($this->DT_Column)) {
            $this->DT_Column = $this->defaultColumn;
        }

        if ($flag) {
            return $query->where($this->DT_Column, '!=', null);
        } else {
            return $query->where($this->DT_Column, '=', null);
        }
    }