php - How could I achieve sending emails in Symfony2/SwiftMailer service with the following criteria? -

i'm trying achieve task killing me! can ugly message without success! below 2 simple classes....which pretend through form in app send emails selecting persons in db according 2 criterias inserted through metioned form(products , city).

what should possible reasons of error:

 exception occurred while executing 'select u0_.email email0 userinfo u0_ u0_.city = ? , u0_.products = ? limit 1' params [{}, {}]: catchable fatal error: object of class quotera\emailbundle\entity\email not converted string        public function emailaction(request $request){         $email = new email();          $form = $this->createform(new emailtype());         if ($request->ismethod('post')) {             $form->submit($request);              if ($form->isvalid()) {       $city = $email->setcity($form->get('city')->getdata());             $product =$email->setproduct($form->get('product')->getdata());                  $user = $this->getuser();                 $email->setowner($user);                 $email->setname($user);                 $email->setcity($form->get('city')->getdata());                 $email->setproduct($form->get('product')->getdata());                 $email->setmessage($form->get('message')->getdata());                 $email->setemail("exellent@sometoon.com");                           $email->setemailto($this->sendemailstoproviders($city, $product));                 $email->settime($form->get('time')->getdata());                 $em = $this->getdoctrine()->getmanager();                 $em->persist($email);                 $em->flush();                 $message = \swift_message::newinstance()                     ->setsubject($form->get('product')->getdata())                     ->setfrom('exellent@sometoon.com')                     ->setto($this->sendemailstoproviders($city,$product))                     ->setcharset('utf-8')                     ->setcontenttype('text/html')                     ->setbody('thank you', 'text/html');                 $this->get('mailer')->send($message);                 $request->getsession()->getflashbag()->add('success', 'your quotation has been sent' );              }         }         return array(             'form' => $form->createview()         );      }      public function sendemailstoproviders($city, $product)     {         $em = $this->getdoctrine ()->getmanager();         $qb = $em->createquerybuilder();          $emails = $qb->select('u')->from('userbundle:userinfo', 'u')             ->select('u.email')             ->andwhere('u.city = :city')             ->setparameter('city', $city)             ->andwhere('u.product = :product')             ->setparameter('product',  $product  )             ->setmaxresults(5)             ->getquery()             ->execute();           if(!$emails){            throw new notfoundhttpexception('sorry, no providers criteria!');         }         return $emails; }      if  var_dump($this->sendemailstoproviders('berlin','butter' )) ; result  array (size=5)   0 =>      array (size=1)       'email' => string 'iancasillasbuffon@gmail.com' (length=27)   1 =>      array (size=1)       'email' => string 'iancasillasbuffon@gmail.com' (length=27)   2 =>      array (size=1)       'email' => string 'eddynvg@hotmail.com' (length=19)   3 =>      array (size=1)       'email' => string 'dolphin23@dolphin.net' (length=21)   4 =>      array (size=1)       'email' => string 'dolphin@dolphin.org' (length=19)         <?php  namespace quotera\emailbundle\entity;  use doctrine\orm\mapping orm; //use gedmo\mapping\annotation gedmo; use symfony\component\validator\constraints assert; use symfony\component\httpfoundation\file\uploadedfile; use quotera\userbundle\entity\user;       /**     * email     *     * @orm\table(name="quottum_email")     * @orm\entity(repositoryclass="quotera\emailbundle\repository\emailrepository")     * @orm\haslifecyclecallbacks     *     */     class email     { /**  * @var integer  *  * @orm\column(name="id", type="integer")  * @orm\id  * @orm\generatedvalue(strategy="auto")  */ private $id;  /**  * @orm\manytoone(targetentity="quotera\userbundle\entity\user")  * @orm\joincolumn(ondelete="cascade")  */ private $owner;  /**  * @orm\column(type="string", length=255)  * @assert\notblank  */ private $name;  /**  * @var integer  *  * @orm\column(name="tracking", type="integer")  */ private $tracking;  /**  * @orm\column(type="string")  */ private $ip;  /**  * @var string  *  * @orm\column(name="quotation_sender", type="string", length=255)  */ private $quotationsender;  /**  * @var string  *  * @orm\column(name="product", type="string", length=255)  */ private $product;  /**  * @var string  *  * @orm\column(name="city", type="string", length=255)  */ private $city;  /**  * @var string  *  * @orm\column(name="category", type="string", length=255)  */ private $category;  /**  * @var string  *  * @orm\column(name="message", type="string", length=255)  */ private $message;  /**  * @var integer  *  * @orm\column(name="message_id", type="integer")  */ private $messageid;  /**  * @var integer  *  * @orm\column(name="quantity", type="integer")  */ private $quantity;  /**  * @var string  *  * @orm\column(name="qty_type", type="string", length=255)  */ private $qtytype;  /**  * @var string  *  * @orm\column(name="username", type="string", length=255)  */ private $username;  private $temp;  /**  * @var string  *  * @orm\column(name="image", type="string", length=255, nullable=true)  */ private $image;  /**  * @var string  *  * @orm\column(name="email", type="string", length=255)  */ private $email;  /**  * @var string  *  * @orm\column(name="email_to", type="string", length=255)  */ private $emailto;  /**  *  * @var string  * @orm\column(name="captcha", type="string",  nullable=false)  */ private $captcha;   /**  * @assert\file(maxsize="6000000")  */ private $file;  /**  * @var \datetime  *  * @orm\column(name="time", type="date", nullable=true)  */ private $time;   /**  * id  *  * @return integer  */ public function getid() {     return $this->id; }  /**  * @param user $owner  */ public function setowner(user $owner) {     $this->owner = $owner; }  /**  * @return user  */ public function getowner() {     return $this->owner; }   /**  * @param mixed $name  */ public function setname($name) {     $this->name = $name; }  /**  * @return mixed  */ public function getname() {     return $this->name; }    /**  * set tracking  *  * @param integer $tracking  * @return email  */ public function settracking($tracking) {     $this->tracking = $tracking;      return $this; }  /**  * tracking  *  * @return integer  */ public function gettracking() {     return $this->tracking; }  /**  * set quotationsender  *  * @param string $quotationsender  * @return email  */ public function setquotationsender($quotationsender) {     $this->quotationsender = $quotationsender;      return $this; }  /**  * quotationsender  *  * @return string  */ public function getquotationsender() {     return $this->quotationsender; }  /**  * set product  *  * @param string $product  * @return email  */ public function setproduct($product) {     $this->product = $product;      return $this; }  /**  * product  *  * @return string  */ public function getproduct() {     return $this->product; }  /**  * set city  *  * @param string $city  * @return email  */ public function setcity($city) {     $this->city = $city;      return $this; }  /**  * city  *  * @return string  */ public function getcity() {     return $this->city; }  /**  * set category  *  * @param string $category  * @return email  */ public function setcategory($category) {     $this->category = $category;      return $this; }  /**  * category  *  * @return string  */ public function getcategory() {     return $this->category; }  /**  * set message  *  * @param string $message  * @return email  */ public function setmessage($message) {     $this->message = $message;      return $this; }  /**  * message  *  * @return string  */ public function getmessage() {     return $this->message; }  /**  * set messageid  *  * @param integer $messageid  * @return email  */ public function setmessageid($messageid) {     $this->messageid = $messageid;      return $this; }  /**  * messageid  *  * @return integer  */ public function getmessageid() {     return $this->messageid; }  /**  * set quantity  *  * @param integer $quantity  * @return email  */ public function setquantity($quantity) {     $this->quantity = $quantity;      return $this; }  /**  * quantity  *  * @return integer  */ public function getquantity() {     return $this->quantity; }  /**  * set qtytype  *  * @param string $qtytype  * @return email  */ public function setqtytype($qtytype) {     $this->qtytype = $qtytype;      return $this; }  /**  * qtytype  *  * @return string  */ public function getqtytype() {     return $this->qtytype; }  /**  * set username  *  * @param string $username  * @return email  */ public function setusername($username) {     $this->username = $username;      return $this; }  /**  * username  *  * @return string  */ public function getusername() {     return $this->username; }  /**  * set image  *  * @param string $image  * @return email  */ public function setimage($image) {     $this->image = $image;      return $this; }  /**  * image  *  * @return string  */ public function getimage() {     return $this->image; }  /**  * set email  *  * @param string $email  * @return email  */ public function setemail($email) {     $this->email = $email;      return $this; }  /**  * email  *  * @return string  */ public function getemail() {     return $this->email; }  /**  * set emailto  *  * @param string $emailto  * @return email  */ public function setemailto($emailto) {     $this->emailto = $emailto;      return $this; }  /**  * emailto  *  * @return string  */ public function getemailto() {     return $this->emailto; }  /**  * @param mixed $ip  */ public function setip($ip) {     $this->ip = $ip; }  /**  * @return mixed  */ public function getip() {     return $this->ip; }  /**  * @param mixed $captcha  */ public function setcaptcha($captcha) {     $this->captcha = $captcha; }  /**  * @return mixed  */ public function getcaptcha() {     return $this->captcha; }  /**  * @orm\column(type="string", length=255, nullable=true)  */ private  $path;   public function getwebpath() {     return null === $this->path         ? null         : $this->getuploaddir().'/'.$this->path; }  protected function getuploadrootdir() {     // absolute directory path uploaded     // documents should saved     return __dir__.'/../../../../web/'.$this->getuploaddir(); }  protected function getuploaddir() {     // rid of __dir__ doesn't screw     // when displaying uploaded doc/image in view.     return 'images/products'; }  /**  * sets file.  *  * @param uploadedfile $file  public function setfile(uploadedfile $file = null) { $this->file = $file; // check if have old image path if (isset($this->path)) { // store old name delete after update $this->temp = $this->path; $this->path = null; } else { $this->path = 'initial'; } }  */ /**  * sets file.  *  * @param uploadedfile $file  */ public function setfile(uploadedfile $file = null) {     $this->file = $file;     // check if have old image path     if (isset($this->path)) {         // store old name delete after update         $this->temp = $this->path;         $this->path = null;     } else {         $this->path = 'initial';     } }  /**  * @orm\prepersist()  * @orm\preupdate()  */ public function preupload() {     if (null !== $this->getfile()) {         $this->path = $this->getfile()->guessextension();     } } /**  * file.  *  * @return uploadedfile  */ public function getfile() {     return $this->file; }  /**  * @orm\postpersist()  * @orm\postupdate()  */ /**  * @orm\postpersist()  * @orm\postupdate()  */ public function upload() {     if (null === $this->getfile()) {         return;     }      // check if have old image     if (isset($this->temp)) {         // delete old image         unlink($this->temp);         // clear temp image path         $this->temp = null;     }      // must throw exception here if file cannot moved     // entity not persisted database     // uploadedfile move() method     $this->getfile()->move(         $this->getuploadrootdir(),         $this->id.'.'.$this->getfile()->guessextension()     );      $this->setfile(null); }  /**  * @orm\preremove()  */ public function storefilenameforremove() {     $this->temp = $this->getabsolutepath(); }  /**  * @orm\postremove()  */ public function removeupload() {     if (isset($this->temp)) {         unlink($this->temp);     } }  public function getabsolutepath() {     return null === $this->path         ? null         : $this->getuploadrootdir().'/'.$this->id.'.'.$this->path; }  /**  * @param \datetime $time  */ public function settime($time) {     $this->time = $time; }  /**  * @return \datetime  */ public function gettime() {     return $this->time; }      /**  * set path  *  * @param string $path  *  * @return email  */ public function setpath($path) {     $this->path = $path;      return $this; }  /**  * path  *  * @return string  */ public function getpath() {     return $this->path;   } } 

hope 1 of genious outhere bring light path! , bless in advance!

check dump() if $city , $product strings not class or array.

   $city = $email->setcity($form->get('city')->getdata());           $product =$email->setproduct($form->get('product')->getdata()); 

maybe need this

  $city = $form->get('city')->getdata();          $product =$form->get('product')->getdata();    $email->setcity($city);          $email->setproduct($product);