Add new element in nested array in mongodb php

Question

I want to add a new element in array appusergoogleid. But I am getting error that i am adding object in array.

$id=array("id"=>$appusergoogleid);

$collection->update(array("appuseremail"=>$appuseremail),array('$push' => array('appusergoogleid'=>$id)));

This is the json in which im inserting

 { 
   "_id":ObjectId("55cc982946449835298b4567"),
   "appuserfirstname":"demo",
   "appuserlastname":" appuserlastname",
   "appusermiddlename":"xyz",
   "appuseremail":"abc@gmail.com",
   "follows":"1",
   "appusergoogleid":{ 
      "id":"wemhjgh"
   },
   "usercreationdate":ISODate(   "2015-08-13T18:44:17Z"   ),
   "status":"0"
}

i want that whenever i add something in appusergoogleid, it makes an array there instead of object.

Answer 1

$filter = array('_id'=>$id));
$update = array('$addToSet'=>array('done_by'=>'2'));
$q->update($filter,$update);

When you need to update use $addToSet so you avoid duplicate inserts which leads to multiple entries.