How to use Yii trait in controller - yii

Question

In my controllers a lot of code, about 1000 lines
Advise how you can make more convenient, for example to make a piece of code in trait
components/ProductTrait.php
trait ProductTrait{
protected function getProductProvider(Product $model){
$dataProductProvider = new CActiveDataProvider('Product', array(
'criteria' => array(
'limit' => $pageLimit,
'condition' => 't.creatorId = :creatorId AND t.categoryId =:categoryId',
'order' => 't.created DESC',
'params' => array(
':creatorId' => $model->creatorId,
':categoryId' => $model->categoryId,
),
),
'pagination' => false,
'sort' => false,
));
return $dataProductProvider;
}
}
Controller
class DealerController extends Controller{
use ProductTrait;
public function actionView($id){
$model = $this->loadModel($id);
if ($model === null) {
throw new CHttpException(404, 'The requested page does not exist.');
}
$renderParams['productProvider'] = $this->getProductProvider($model);
}
}

Answer 1

You can use Trait, but you can also use behaviors.
First you declare your behavior
class ProductBehavior extends CBehavior
{
protected function getProductProvider(Product $model){
$dataProductProvider = new CActiveDataProvider('Product', array(
'criteria' => array(
'limit' => $pageLimit,
'condition' => 't.creatorId = :creatorId AND t.categoryId =:categoryId',
'order' => 't.created DESC',
'params' => array(
':creatorId' => $model->creatorId,
':categoryId' => $model->categoryId,
),
),
'pagination' => false,
'sort' => false,
));
return $dataProductProvider;
}
}
Then you use it in your controller (don't forget to attach it, I've done it in the init method)
class DealerController extends Controller{
public function init() {
//Attach the behavior to the controller
$this->attachBehavior("productprovider",new ProductBehavior);
}
public function actionView($id){
$model = $this->loadModel($id);
if ($model === null) {
throw new CHttpException(404, 'The requested page does not exist.');
}
//We use the behavior methods as if it is one of the controller methods
$renderParams['productProvider'] = $this->getProductProvider($model);
}
}
The main point of behaviors is it's working in php 5.3 whereas trait are not.
Now here's some difference between traits and behaviors:
A first difference with behaviors is that traits can not be parameterized.
In your controller you could declare the behaviors this way:
public function behaviors(){
return array(
'ProductBehavior ' => array(
'class' => 'components.behaviors.ProductBehavior',
'firstAttribute' => 'value',
'secondAttribute' => 'value',
)
);
}
Your ProductBehavior class would have 2 public attributes: firstAttribute and secondAttribute.
One thing traits lack when compared to behaviors is runtime attachement. If you want to extend a given (let's say 3rdParty) class with some special functionality, behaviors give you a chance to attach them to the class (or more specifically to instances of the class). Using traits, you had to to modify the source of the class.
A Wiki about behaviors
The Yii Guide
The CBehavior doc