为/第/7条：

public function actionView($id)
{
   return User::findOne($id);
}

或

public function actionView($id)
{
   return User::find()->select([id, title, image, date, author, likes,last_review])->one();
}

用于/文章：

public function actionIndex()
{
   return User::find()->select([id, title, image, date])->all();
}

只需在模型中编写方法。

class MyModel extends ActiveRecord
{
    private static $fieldset_1 = [
       'id', 'title', 'image', 'date'
    ];

    private static $fieldset_2 = [
       'id', 'title', 'image', 'date', 'author', 'likes', 'last_review'
    ];

    public static function get(int $id)
    {
        if($id > 0) {
           return static::find()
              ->select(self::$fieldset_1)
              ->where(['id' => $id])
              ->asArray()
              ->one();
        }
   }

   public static function getList()
   {
      return static::find()
           ->select(self::$fieldset_2)
           ->asArray()
           ->all();
   }

}

在控制器中

class MyController extends Controller{

    public function actionListing(){
        return $this->asJson(MyModel::getList());
    }

    public function actionDetails($id){
        return $this->asJson(MyModel::get((int)$id));
    }

}