Question

I am trying to update and insert a record called ‘enabled’ in all entries that have a ‘title’

{
     "_id": ObjectId("50310c48ba76882419000001"),
     "title": "XKCD",
     "online": true
}   
{
     "_id": ObjectId("50310c48ba76882419000000"),
     "title": "Calvin and Hobbes",
     "author": "Bill Watterson"
}   

Here is my attempt but i seem to be having some problems.

When i run this, nothing happens.
Any help would be appreciated

$mongo = new Mongo();
$db = $mongo->mydb;
$col = $db->members;

$query = array('title'=>array('$exist' => true));
$col->update($query, array('enabled' => '0' ));

Answer 1

I think your problem exists here:

$col->update($query, array('enabled' => '0' ));

This will actually replace all but the unmutable _id field with enabled: 0. Try the $set opreator:

$col->update($query, array('$set' => array('enabled' => '0' )), array('multiple' => true));

http://www.mongodb.org/display/DOCS/Updating#Updating-%24set