I have the following mongodb object:
{
"_id": ObjectId("4d0b9c7a8b012fe287547157"),
"messages": {
"0": {
"toUname": "Eamorr3",
"fromUname": "Eamorr2",
"time": 1292606586,
"id": "ABCDZZZ",
"subject": "asdf",
"message": "asdf",
"read": 0 //I want to change this to 1!
},
"1": {
"toUname": "Eamorr1",
"fromUname": "Eamorr3",
"time": 1292606586,
"id": "EFGHZZZ",
"subject": "asdf2",
"message": "asdf2",
"read": 0
}
},
"uname": "Eamorr3"
}
How do I set "read" to 1 where id=ABCDZZZZ? I'm using PHP.
I've tried the following command:
$driverInboxes->update(array('uname'=>$uname),array('$set'=>array('messages'=>array('id'=>$id,'read'=>'1'))));
But when I do this, overwriting occurs and I get:
{
"_id": ObjectId("4d0b9c7a8b012fe287547157"),
"messages": {
"id": "j7zwr2hzx14d3sucmvp5",
"read": "1"
},
"uname": "Eamorr3"
}
I'm totally stuck. Any help much appreciated.
Do I need to pull the entire array element, modify and and push it back in again?
Many thanks in advance,
If you read your command, you're actually saying: "UPDATE WHERE uname = Eamorr3 SET messages equal to this array (id=blah,read=1)"
When you do a $set
on messages
, you're basically instructing it to take your array as the new value.
However, it looks like you're trying to update a specific message as read which is just a little more complex. So there are two hurdles here:
1: You're actually updating messages.0.read
If you do array('$set' => array( 'messages.0.read' => 1 ) )
, you will update the correct element. Follow that chain, messages
is a javascript object and you want to update the property 0
. The property 0
is itself a javascript object which contains the property read
which you want to update.
Can you see how you're updating messages.0.read
?
This brings us to problem #2.
2: the 0
is a problem for you
If you look at the way you've structured the data in Mongo, the messages object is really sub-par. The "0" and "1" are currently acting as "ids" and they're not very useful. Personally, I would structure your objects with the actual IDs in place of "0" or "1".
So your objects would look like the following:
{
"_id": ObjectId("4d0b9c7a8b012fe287547157"),
"messages": {
"ABCDZZZ": {
"toUname": "Eamorr3",
"fromUname": "Eamorr2",
"time": 1292606586,
"subject": "asdf",
"message": "asdf",
"read": 0 //I want to change this to 1!
}
},
"uname": "Eamorr3"
}
Now you're update command becomes this:
array('$set' => array( 'messages.ABCDZZZ.read' => 1 ) )
This structure makes it much easier to update a specific message or a specific portion of a message.
If you want to keep the array structure for various purposes, you can use the Positional operator . This enables you to take advantage of array features ($pop,$push,etc) while simultaneously being able to update elements which are in an unknown array position.
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