php - Get data from a ManyToMany relationship with Doctrine2 -

i have following relationship n:n between teachers table , groups table, there third teachers_groups table.

i want list teachers bring me groups teacher teaches (** related **), when return of teachers, $teacher->getclasses() empty.

here code:

teacher controller:

namespace app\controllers;  class teachercontroller extends controller {     public function index()     {         $this->teachers = $this->model->getrepository()->findall();         // bring teachers, not bring groups         // $teachers->getgroups()         foreach ($this->teachers $teachers) {             var_dump($teachers->getgroups()); die();         }     } } 

teacher entity:

namespace app\entities;  use doctrine\common\collections\arraycollection arraycollection;  /**  * @entity  * @table(name="teachers")  */ class teacher {     /**      * @id @column(type="integer")      * @generatedvalue(strategy="auto")      **/     private $id;      /**      * @manytomany(targetentity="group", mappedby="teachers")      **/     private $groups;      public function __construct()     {         $this->groups = new arraycollection();     }      public function setgroups($groups)     {         $this->groups = $groups;     }      public function getgroups()     {         return $this->groups;     } } 

group entity:

namespace app\entities;  use doctrine\common\collections\arraycollection arraycollection;  /**  * @entity  * @table(name="groups")  */ class group {     /**      * @id @column(type="integer")      * @generatedvalue(strategy="auto")      **/     private $id;      /**      * @manytomany(targetentity="teacher")      * @jointable(name="teachers_groups",      * joincolumns={@joincolumn(name="id_group",referencedcolumnname="id")},      * inversejoincolumns={@joincolumn(name="id_teacher", referencedcolumnname="id")}      * )      **/     private $teachers;      public function __construct()     {         $this->teachers = new arraycollection();     }      public function setteachers($teachers)     {         $this->teachers = $teachers;     }      public function getteachers()     {         return $this->teachers;     } } 

seems me you're not referencing namespaces correctly in doctrine annotations.

solution 1:

use doctrine\orm\mapping orm;  /**  * @orm\manytomany(targetentity="teacher")  * @orm\jointable(name="teachers_groups", ... 

or solution 2:

use doctrine\orm\mapping\manytomany; use doctrine\orm\mapping\jointable; ... /**  * @manytomany(targetentity="teacher")  * @jointable(name="teachers_groups", ... 

in other words, annotations ignored. i'm surprised teacher repository recognizes teacher class entity.