add role checking to controllers

backend/views/discount/view.php

@@ -2,6 +2,7 @@
 
 use yii\helpers\Html;
 use yii\widgets\DetailView;
+use common\components\RoleDefinition;
 
 /* @var $this yii\web\View */
 /* @var $model common\models\Discount */
@@ -14,18 +15,11 @@ $this->params['breadcrumbs'][] = $this->title;
 
     <h1><?= Html::encode($this->title) ?></h1>
 
-    <p>
-        <?= Html::a(Yii::t('common/discount', 'Update'), ['update', 'id' => $model->id_discount], ['class' => 'btn btn-primary']) ?>
-        <?php 
-/*        Html::a(Yii::t('common/discount', 'Delete'), ['delete', 'id' => $model->id_discount], [
-            'class' => 'btn btn-danger',
-            'data' => [
-                'confirm' => Yii::t('common/discount', 'Are you sure you want to delete this item?'),
-                'method' => 'post',
-            ],
-        ])*/
-        ?>
-    </p>
+    <?php if ( RoleDefinition::isAdmin()) {?>
+	    <p>
+	        <?= Html::a(Yii::t('common/discount', 'Update'), ['update', 'id' => $model->id_discount], ['class' => 'btn btn-primary']) ?>
+	    </p>
+    <?php }?>
 
     <?= DetailView::widget([
         'model' => $model,