association between Models

hi guys,... I can't find " GroupUser " association between Models 

can anyone help please,...? 

I have a Notification Model: 

<?php

class Notification extends AppModel {

  var $name = 'Notification';

    var $validate = array(

     'user_id' => array(

      'rule' => 'notEmpty',

     ),

     'friend_id' => array(

      'rule' => 'notEmpty',

     ),

     'photo_id' => array(

      'rule' => 'notEmpty',

     ),

     'group_id' => array(

      'rule' => 'notEmpty',

     ),

     'blog_id' => array(

      'rule' => 'notEmpty',

     ),

 );

var $belongsTo = array(

'User' => array('className' => 'User', 'foreignKey'    => 'friend_id'),

'Photo' => array('className' => 'Photo', 'foreignKey'    => 'photo_id'),

'Group' => array('className' => 'Group', 'foreignKey'    => 'group_id'),

'Blog' => array('className' => 'Blog', 'foreignKey'    => 'blog_id')

);

}

?> 

and Group Model: 

<?php

class Group extends AppModel {

  var $name = 'Group';

 

    var $validate = array(

     'user_id' => array(

      'rule' => 'notEmpty',

     ),

     'name' => array(

      'rule' => 'notEmpty',

     ),

     'description' => array(

      'rule' => 'notEmpty',

     ),

 );

var $belongsTo = array(

'User' => array('className' => 'User', 'foreignKey'    => 'user_id')

);

}

?> 

finding Group is OK,... 

<?php echo $html->link($groupBannerShow->square($note), '/groups/view/' . $note['Group']['id'], array('escape'=>false)) ?>

but I also need to find " GroupUser " in a view,... 

I'm getting error: Undefined index:  GroupUser 

<?php echo $html->link($note['GroupUser']['firstname'] . ' ' . $note['GroupUser']['lastname'], '/profile/' . $note['GroupUser']['username']) ?>

thanks in advance 

chris 

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