update

@@ -141,7 +141,7 @@ class Product extends Base
         return RouteMap::getRoute(RouteMap::SOURCE_PRODUCT, $this->id, $this->project_id);
         return RouteMap::getRoute(RouteMap::SOURCE_PRODUCT, $this->id, $this->project_id);
     }
     }
 
 
-    public function getNumByProjectId($project_id){
+    public static function getNumByProjectId($project_id){
         return self::where('project_id', $project_id)->where('status', self::STATUS_ON)->count();
         return self::where('project_id', $project_id)->where('status', self::STATUS_ON)->count();
     }
     }