Ido: Map h.host_object_id to s.host_object_id in the ServicegroupQuery

This is required to make filters work which filter by host custom variables without using any host related table.

modules/monitoring/library/Monitoring/Backend/Ido/Query/ServicegroupQuery.php

@@ -18,6 +18,9 @@ class ServicegroupQuery extends IdoQuery
         'hostgroups' => array(
             'hostgroup_name' => 'hgo.name1'
         ),
+        'hosts' => array(
+            'h.host_object_id' => 's.host_object_id'
+        ),
         'instances' => array(
             'instance_name' => 'i.instance_name'
         ),
@@ -70,6 +73,16 @@ class ServicegroupQuery extends IdoQuery
         );
     }
 
+    /**
+     * Join hosts
+     *
+     * This is required to make filters work which filter by host custom variables.
+     */
+    protected function joinHosts()
+    {
+        $this->requireVirtualTable('services');
+    }
+
     /**
      * Join instances
      */