Joomla Jumpstart

One of the great things about Mongo is the ability to have arrays associated with a record without having to add an additional related table (as you do in a traditional database). In PHP, you can easily add an element to a Mongo database array with the $push command through either an update or an upsert.

$myCollection->update($queryArray, array('$push' => $newData ));

To make it an upsert (update if present, insert if not), use this:

$upsert = true; 

$myCollection->update($queryArray, array('$push' => $newData ), array("upsert" => $upsert));

That will add the information in $newData to the array. So to add a timestamp entry to an array of timestamps where there is an "id" column, you could use this command:

$myCollection->update(array('id'=>1), array('$push' => array('ts'=>time()) ), array("upsert" => $upsert));

The command will find the first record with an id of 1 and push the current timestamp into an array called"ts"and create it if it doesn't exist.