public function actionSendmessage()
 {
     //insert into conversation first and get the PK
     //then insert into rooms_conversations by adding the conversation's PK
     $model = new Conversations();
     if ($model->load(\Yii::$app->getRequest()->getBodyParams(), '')) {
         $chatData = \Yii::$app->getRequest()->getBodyParams();
         $model->user_id = $chatData['user_id'];
         $model->message = $chatData['message'];
         if ($model->save()) {
             $cr_id = $model->cr_id;
             $room = new RoomsConversations();
             $room->mr_id = $chatData['mr_id'];
             $room->cr_id = $cr_id;
             return $room->save();
         }
     }
 }