Yii, relation model filter search - php

Question

I am battling with CGridView filtering using the related model column, I have two models Cars and Colour, so Colour has_many Car and Car belongs_to Colour. The grid column from related model displays fine, I'm just not able to filter with it. I am getting mysql error
Column not found: 1054 Unknown column 'carName'
Colour model HAS_MANY - Cars
I declaired the variable $carName from the Car model, so this model can see it.
public $carName;
public function rules()
{
return array(
array('id, carName, colourName', 'safe', 'on'=>'search'),
)
}
public function relations()
{
return array(
'CarsObj'=>array(self::HAS_MANY, 'Cars', 'colourID')
);
}
public function search()
{
$criteria=new CDbCriteria;
$criteria->with = "CarsObj";
$criteria->compare('carName', $this->carName, true);
$criteria->compare('id',$this->id);
$criteria->compare('colourName',$this->colourName,true);
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
));
}
Car Model BELONGS_TO - Colour
public function relations()
{
return array(
'ColourObj'=>array(self::BELONGS_TO, 'Colour', 'colourID')
);
}
CGridView, i am using the Colour Model search as my dataProvider
$model = new Colour('search');
$data = $model->search();
$this->widget('zii.widgets.grid.CGridView', array(
'dataProvider'=>$data
,'filter'=>$model
,'pager'=>array('header'=>'')
,'columns'=>array( //related model column
'id',
'colourName',
array(
'header' => 'carName',
'type' => 'raw',
'name' => 'carName',
'value' => function($data, $row) { //$data is item of DataProvider, $row is number of row (starts from 0)
$carNames= CHtml::listData((array)$data->ColourObj, 'id', 'carName');
return implode(', ', $carNames);
}
)

Answer 1

By default CActiveRecord using lazy load. You need to set attribute together true. Also it's a good practice to set table alias when you using with.
public function search(){
$criteria=new CDbCriteria;
$criteria->together = true;
$criteria->with = 'CarsObj';
$criteria->compare('CarsObj.carName',$this->carName,true);
$criteria->compare('t.id',$this->id);
$criteria->compare('t.colourName',$this->colourName,true);
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
));
}

Answer 2

Try this
public function search()
{
$criteria=new CDbCriteria;
$criteria->with = "CarsObj";
$criteria->compare('CarsObj.carName', $this->carName, true);
$criteria->compare('id',$this->id);
$criteria->compare('colourName',$this->colourName,true);
return new CActiveDataProvider($this, array(
'criteria'=>$criteria,
));
}