yii showing data on cgridview from others table - yii

Question

I'm having problem to show data on cgridview using foreign keys.
This is my case, i have table employee(id, username), client(id, username), and transaction(id, employeeId, clientId). employeeId foreign key to employee.id, and clientId is foreign key to client.id. Now, I want to show employee's name and client's name instead of their id on transaction admin.php.
This is my code:
class Transaction extends CActiveRecord
{
public $client_search;
public $employee_search;
public function rules()
{
return array(
.
.
.
array('id, employeeId, clientId, balance, status, date, client_search, employee_search', 'safe', 'on'=>'search'),
);
}
public function relations()
{
return array(
'employee' => array(self::BELONGS_TO, 'Employee', 'employeeId'),
'client' => array(self::BELONGS_TO, 'Client', 'clientId'),
);
}
public function search()
{
$criteria=new CDbCriteria;
$criteria->with = array( 'client', 'employee' );
$criteria->together = true;
$criteria->compare('t.id',$this->id,true);
$criteria->compare('employee.username', $this->employee_search, true );
$criteria->compare('client.username', $this->client_search, true );
$criteria->compare('t.balance',$this->balance,true);
$criteria->compare('t.status',$this->status);
$criteria->compare('t.date',$this->date,true);
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
));
}
//the other functions are there, i don't edit it.
}
that is my model/Transaction.php
<?php $this->widget('zii.widgets.grid.CGridView', array(
'id'=>'transaction-grid',
'dataProvider'=>$model->search(),
'filter'=>$model,
'columns'=>array(
'id',
array(
'header' => 'Employee',
'name' => 'employee_search',
'value' => '$data->employee->username',
),
array(
'header' => 'Client',
'name' => 'client_search',
'value' => '$data->client->username',
),
array(
'class'=>'CButtonColumn',
),
),
));
that is my views/transaction/admin.php.
and this code gave me error Trying to get property of non-object ($data->employee->id marked).
Actually I have succed to show the employee's name instead of employee's id, but, after that I use the same method for the client, and the error appear.
anyone can help me? My method is making public employee_search, add the rules, add the relation, adding $creiteria->with, then change the admin.php. Anyone please help me.
//UPDATE
SOLVED. Its actually my fault. There is an error in the database about the relation (foreign key). My coding is fine.

Answer 1

It's hard to guess without being able to debug your code but here are some things that could help (I'll add more as I can think of them).
It might be because both the default joinType for relations is LEFT OUTER JOIN and maybe you have a Transaction where one of them is null? If you try to access attributes on null object (as opposed to an actual ActiveRecord object), that's precisely the error message you would be seeing.
You could change it by doing:
public function relations()
{
return array(
'employee' => array(self::BELONGS_TO, 'Employee', 'employeeId',array('joinType'=>'INNER JOIN')),
'client' => array(self::BELONGS_TO, 'Client', 'clientId',array('joinType'=>'INNER JOIN')),
);
}
P.S.: INNER JOIN is the same as just JOIN
Not sure if it will help you, but it's worth trying.
More information at: http://www.yiiframework.com/doc/api/1.1/CActiveRecord#relations-detail