public function idExists($identifer = null)
    {
        if (is_null($identifer)) {
            $identifer = $this->getMyKey();
        }
        $ignorestate = $this->ignore404();
        $this->ignore404(true);
        $cands       = $this->getFlexiData(null,
            [
                'detail' => 'custom:'.$this->getKeyColumn(),
                $this->getKeyColumn() => $identifer
        ]);
        $this->ignore404($ignorestate);
        return ($this->lastResponseCode == 200) && !empty($cands);
    }