Yii2 behavior usage and its calling method

yii2 Of Behavior In fact, that is yii Behavior in , You can expand existing classes , Without modifying existing classes , Expand the functions of classes . By binding behavior to a class , It can make the class have the properties and methods of the behavior itself , It's like these attributes and functions that a class already has .

Use ：

First create a folder in the root directory , The name is components, Create another file named MyBehavior

namespace app\components;

use yii\db\ActiveRecord;
use yii\base\Behavior;

class MyBehavior extends Behavior
{
    //  Other code 

    public function events()
    {
        return [
            ActiveRecord::EVENT_BEFORE_VALIDATE => 'beforeValidate',
        ];
    }

    public function beforeValidate($event)
    {
        //  Processor method logic 
        $model = $this->owner;
        $model->content .= '--beforeinsert';
    }
}

Call mode ：

• Static call mode ：

         Static call mode , Is to call in the corresponding model . Then use the methods in the model normally ,

use app\components\HelloBehavior;

class Test extends ActiveRecord
{
    public function behaviors()
    {
//        return parent::behaviors(); // TODO: Change the autogenerated stub
        return [
            'hello'=>HelloBehavior::className(),
        ];
    }
}

 

• Dynamic call mode ：

       The dynamic call method is used in the controller ,new After a model , In the use of attachBehaviors

use app\components\HelloBehavior;

use yii\web\Controller;
use app\models\Test;
use app\components\HelloBehavior;

class TestController extends Controller
{

    public function actionSave(){

        $model = new Test();
        $model->attachBehaviors([
            HelloBehavior::className()
        ]);
        $model->content = 'behavior test 1';
        $model->create_at = date('Y-m-d H:i:s');
        dd( $model->save() );
    }
}