change initialization of DbManager in AbstractItem and Permission. [issue94]

Author: laherre

models/rbacDB/AbstractItem.php

@@ -85,7 +85,7 @@ public static function addChildren($parentName, $childrenNames, $throwException
 
 		$childrenNames = (array) $childrenNames;
 
-		$dbManager = new DbManager();
+		$dbManager = Yii::$app->authManager instanceof DbManager ? Yii::$app->authManager : new DbManager();
 
 		static::beforeAddChildren($parentName, $childrenNames, $throwException = false);
 		foreach ($childrenNames as $childName)

models/rbacDB/Permission.php

@@ -17,7 +17,9 @@ class Permission extends AbstractItem
 	 */
 	public static function getUserPermissions($userId)
 	{
-		return (new DbManager())->getPermissionsByUser($userId);
+		$dbManager = Yii::$app->authManager instanceof DbManager ? Yii::$app->authManager : new DbManager();
+		
+		return $dbManager->getPermissionsByUser($userId);
 	}
 
 	/**
@@ -69,4 +71,4 @@ public static function assignRoutes($permissionName, $routes, $permissionDescrip
 
 		return true;
 	}
-}
+}