php - Select element from other table on the form zf2 -

i have 2 table manytoone relation on database between client , sale , want select id_client on sale form . o used .

saleform :

public function __construct(clienttable $table)     {         parent::__construct('vente');          $this->setattribute('method', 'post');         $this->clienttable = $table;              $this->add(array(             'name' => 'id',             'attributes' => array(                 'type'  => 'hidden',             ),         ));         $this->add(                 array(                     'name' => 'id_client',                     'type' => 'select',                     'attributes' => array(                         'id'    => 'id_client'                     ),                     'options' => array(                         'label' => 'catégory',                         'value_options' => $this->getclientoptions(),                         'empty_option'  => '--- sélectionnez une categorie---'                     ),                 )             );          public function getclientoptions()         {             $data  = $this->clienttable->fetchall()->toarray();             $selectdata = array();              foreach ($data $key => $selectoption) {                 $selectdata[$selectoption["id"]] = $selectoption["nom_client"];             }              return $selectdata;         } } 

salecontroller:

use zend\mvc\controller\abstractactioncontroller; use zend\view\model\viewmodel; use caisse\model\sale;           use caisse\form\saleform;   class salecontroller extends abstractactioncontroller {     protected $saletable;     protected $clienttable;      public function addaction()     {         $form = new saleform($this->clienttable);         $form->get('submit')->setvalue('ajouter');          $request = $this->getrequest();         if ($request->ispost()) {             $vente = new sale();             $form->setinputfilter($sale->getinputfilter());             $form->setdata($request->getpost());              if ($form->isvalid()) {                 $vente->exchangearray($form->getdata());                 $this->getsaletable()->savesale($sale);                   return $this->redirect()->toroute('sale');             }         }         return array('form' => $form);      } } 

but every time had issue:

catchable fatal error: argument 1 passed caisse\form\saleform::__construct() must instance of admin\model\clienttable, null given.

is method it, reference same example welcome.

thank you

inside controller, function addaction, never set variable clienttable maybe forgot initialize it.

like this

public function addaction() {     $this->clienttable = $this->getservicelocator()->get('client\model\clienttable');     $form = new saleform($this->clienttable);     // ... } 

about

    public function getclientoptions()     {         $data  = $this->clienttable->fetchall();         $selectdata = array();          foreach ($data $row) {             $selectdata[$row->id] = $row->nom_client;         }          return $selectdata;     }