Yii2 Basic sql query in view - yii2

Question

I'm trying to get the user profile image of the author of the content inside the view , my view is channel I created but I get this error on my view
Undefined variable: queryAvatar
on my view I did
//Yii2 View code
use yii\helpers\Html;
use yii\widgets\DetailView;
/* #var $this yii\web\View */
/* #var $model app\models\Channel */
$this->title = $model->Channel_name;
?>
<div class="channel-view">
<h1><?= Html::encode($this->title) ?></h1>
<div><?php echo $queryAvatar; ?></div> // THE LINE I ADD
<?php if($model->uid == Yii::$app->user->id):?>
<p>
<?= Html::a('Update', ['update', 'id' => $model->Channel_id], ['class' => 'btn btn-primary']) ?>
<?= Html::a('Delete', ['delete', 'id' => $model->Channel_id], [
'class' => 'btn btn-danger',
'data' => [
'confirm' => 'Are you sure you want to delete this item?',
'method' => 'post',
],
]) ?>
</p>
<?php endif;?>
</div>
and on my controller I created this function
//function on my controller
public function actionChannel($id)
{
$cchannel = new Channel();
$queryAvatar = (new \yii\db\Query())
->select(['uavatar'])
->from('userlogin')
->where(['uid' => $cchannel->uid])
->All();
return $this->render('channel', [
'model' => $this->findModel($id),
'queryAvatar '=> $queryAvatar ,
]);
}

Answer 1

in your controller you define an empty model so your $cchannel->uid is empty.
You must define first your model like this
public function actionChannel($id)
{
$cchannel = $this->findModel($id);
$queryAvatar = (new \yii\db\Query())
->select(['uavatar'])
->from('userlogin')
->where(['uid' => $cchannel->uid])
->All();
return $this->render('channel', [
'model' => $cchannel ,
'queryAvatar '=> $queryAvatar ,
]);
}

Answer 2

The problem can be caused by space when you created array of variable before giving to view.
return $this->render('channel', [
'model' => $this->findModel($id),
'queryAvatar '=> $queryAvatar ,
]);
remove space from 'queryAvatar '
Like this:
return $this->render('channel', [
'model' => $this->findModel($id),
'queryAvatar'=> $queryAvatar ,
]);
Another problem can be caused by partial view in side view. For example when you call view:channel from controller inside it may be you view called like this.
<?=$this->render('your_view')?>
So, you should pass your variable to this view also like this.
<?=$this->render('your_view',['queryAvatar'=>$queryAvatar])?>
And finally you cannot echo the varable $queryAvatar beacuse it is array of objects. Therefore use the function print_r();
Like this.
<div><?php print_r($queryAvatar); ?></div> // THE LINE I ADD