yii1 Plus Yii2

We can achieve this in two steps

• Using base controller from Yii1
• Using base controller from Yii2

For every step, I have created two repository. We'll use it accordingly

Steps to follow

**: Mandatory

*: Somehow mandatory

(no star): optional

• Make your project composer compatible and use yii1 with composer dependency**

  Add classmap in autoloader, and put all you resources folder in its value

  composer dump-autoload

  Resolve all warning for Ambiguous class resolution

• Install my both repo using composer**

  composer require ahmadasjad/yii1plushyii2
  composer require ahmadasjad/yii2plusyii1
  

• Create two branch of git one with yii1Controller and another with yii2Controller

• Create a yii2 config directory inside site/protected/config/yii2 *

• Copy index.php and Yii2Yii1.php file from ahmadasjad/yii2plusyii1 repo to your site directory or customize index.php according to your files structure and config *

• Create a custom Controller and extend it from \ahmadasjad\yii1PlusYii2\Controller **

  Now, in every controller extend from your customized controller. This will help you to change only inside your base custom controller in future when you use the controller from Yii2

• Replace View class*

  Add this to your Yii2 config

  'components' => [
      'view' => ['class' => \ahmadasjad\yii1PlusYii2\View::class],
  ],

• Register Yii2 assets in yii1*

  Add Yii::$app->getView()->registerYii2Assets(); inside the layout or view file. This will create a bridge in publishing Yii2 assets in yii1.

• add return before render('yourView', ['model' => $model]) call inside every controller.

• Make your controllers namespaced *: https://www.yiiframework.com/doc/guide/1.1/en/basics.namespace#namespaced-controllers

• Add following function inside the config while bootstrapping the app:

  function() {
      //Set modelName converter for Yii1 models class in html form
      CHtml::setModelNameConverter(function ($model){
          $className = get_class($model);
          $reflector = new ReflectionClass($className);
          return $reflector->getShortName();
      });
  }

  Now your config should look like:

  return [
      ...,
      'aliases' => [...],
      'bootstrap' => [
          ...,
          function() {
              //Set modelName converter for Yii1 models class in html form
              CHtml::setModelNameConverter(function ($model){
                  $className = get_class($model);
                  $reflector = new ReflectionClass($className);
                  return $reflector->getShortName();
              });
          },
          ...,
      ],
      'components' => [...],
      ...
  ];

Tips

• Remove unnecessary codes generated by GII crud like index.php, _view.php files from view and actionIndex() method from controller

Problems and solutions

Conversion

• zii.widgets.jui.CJuiDatePicker -> yii\jui\DatePicker\DatePicker
• CStarRating -> \yii2mod\rating\StarRating
• zii.widgets.jui.CJuiAutoComplete -> \yii\jui\AutoComplete
• zii.widgets.CDetailView -> \yii\widgets\DetailView

Links helped during the development

• https://github.com/yiiext/yii2-yii-bridge
• https://github.com/neam/yii-yii2-bridge
• https://www.yiiframework.com/doc/guide/2.0/en/tutorial-yii-integration#using-both-yii2-yii1
• https://www.yiiframework.com/doc/guide/2.0/en/intro-upgrade-from-v1