use app\models\User;
$right = Right::findOne(2);
//$user = User::find()->where(['right_id' => $right->attributes['id']])->all();
$user = $right->hasMany(User::className(),['right_id' => 'id'])->all();
//right_id为User::className()表中字段，id为Right::findOne(2)表字段

namespace app\models;
use \yii\db\ActiveRecord;
class Right extends ActiveRecord
{
  public function getUsers()
  {
    $users = $this->hasMany(User::className(),['right_id' => 'id'])->asArray()p->all();
    return $users;
  }
}

public function actionAbout()
{
  $right = Right::findOne(2);
//  $users = $right->getRights();
  $users = $right->rights;
  dd($users);
  return $this->render('about');
}

namespace app\models;
use \yii\db\ActiveRecord;
class User extends ActiveRecord
{
  public function getRight()
  {
    $right = $this->hasOne(Right::className,['id' => 'right_id'])->asArray();
    return $right;
  }
}

$user = User::findOne(1);
$right = $user->user;
dd($right);
return $this->render('about');

//查询关联表的所有数据
$user = User->find()->with('right')->asArray()->all();