显示第三个表中的字段

Question

I am trying to display a field from a 3rd table in a relationship, and after checking posts here and the docs, I am still stuck.I have 3 models all related in some way. I have found similar posts here but I am still not getting it to work. I am learning so sorry if I have missed this somewhere in the docs but I have read a fair bit and have tried a lot. I am guessing too much now on this so I need help.

 1)Tutorsession - belongsto teachers,
 2)  Teacher -has 1 user,hasmany tutorsessions
 3)    User- has 1 teacher, //////I want to display a field from this table given I display tutorsessions

In controller    
$this->set('tutor',
    $this->Tutorsession->find('first',
        array(
            'conditions' => array('Teacher.user_id' => $id),
            'contain' => 'User.username'
        )
    )
); //////////no error but no results

from view  echo '<td>'. $item['User']['username'].'</td>'; ///////error user undefined

The tutorsession automatically gets rows from teacher table but not user table witht he model setup on a findall.

I want to display a username from the user table. I display the tutorsession table , I then can display the teacher table with the model association but I cant go from the teacher table to the user table to get a user name from the user id as the common field. I have checked the docs below and I am not sure why my code isnt ble to display a username from users table.

http://book.cakephp.org/2.0/en/core-libraries/behaviors/containable.html http://book.cakephp.org/2.0/en/models/retrieving-your-data.html

update: here are the models

class User extends AppModel {

     public $hasOne = array(
        'Teacher' => array(
            'className' => 'Teacher',
            'dependent' => true
        )

class Tutorsession extends AppModel
{
 public $name='Tutorsession';

     public $belongsTo = array(
        'Teacher' => array(
            'className' => 'Teacher',
            'foreignKey' => 'teacher_id'
        )

class Teacher extends AppModel
{

    public $name='Teacher';
    public $hasMany = array('Tutorsession');
     public $belongsTo = array(
        'User' => array(
            'className' => 'User',
            'foreignKey' => 'user_id'
        )
    );

Answer 1

Try this:

$this->Tutorsession->recursive = 2;
$this->Tutorsession->Teacher->contain('User');
$this->set('tutor',
    $this->Tutorsession->find('first',
        array(
            'conditions' => array('Teacher.user_id' => $id)
        )
    )
);

Answer 2

$tutor=$this->Teacher->find('first',
        array(
            'conditions' => array('Teacher.user_id' => $id)
        )
    );

debug($tutor); exit();

Your result similar:

'Teacher' => array(
        'id' => '1',
        'name' => 'abc',
        'created' => '1397040385',
        'updated' => '1397725860'
    ),


'User' => array(
        'id' => '4',
        'name' => 'administrators',
        'created' => '1397032953',
        'modified' => '1397032953'
    ),


'Tutorsession' => array(
                 0=>array(
                'id' => '3',
                'name'=>'abc',
                'created' => '1400729137'
                   ),
                 1=>array(
                'id' => '4',
               'name'=>'abc',
               'created' => '1400729137'
                  )
              )

Ensure your models are correct

Answer 3

Add containable behavior in your Model

public $actsAs = array('Containable');

Execute following query In controller

$contain = array('Teacher' => array('User'));
$this->set('tutor', $this->Tutorsession->find('first',array(
        'conditions' => array('Teacher.user_id' => $id),
        'contain' => $contain
    )));