/yii1-to-yii2-migration-checklist

Migrate YII1 to YII2

Variable Replacement:

  • Yii::app()->input -> Yii::$app->request
  • $session->add() -> $session->set()
  • Yii::app() -> Yii::$app

Namespaces:

  • All files must be used to use namespace in YII2.

Database:

  • addCondition function in YII1 should be replaced with where function in YII2.
  • Model relations must be updated since they use new format now.
  • Find by PK must be replaced when quering the database eg: SViews::model()->findByPK($id); -> SViews::findOne($id);
  • Primary key is different in yii1 and yii2. YII1: public function primaryKey() { return 'name'; } YII2: public $primaryKey = 'ListingID';
  • Specifing the table need to be static method instead of non static in Yii1.

Helpers:

  • CJSON::encode -> yii\helpers\Json::encode()
  • Html::dropDownList is using different syntax. You need to add 'id' options manually.

Deployment:

  • Yii1 loads under root but Yii2 loaded in web.

Caching:

  • All caching logics need to be rewritten.

Email:

  • YiiMailMessage must be replace with new mail classes

Extensions:

  • ext.EPhpThumb.EPhpThumb has be replaced with Image::thumbnail($newFilePath, 160, 160)->save('path_to_new_file', ['quality' => 80]);