mongodb 'document' variable define in PHP

Question

I am using Codeigniter with PHP. We can define empty array for mongodb query like following,

$db->user->insert(array('report'=> array()));

How i can define empty document(datatype) for mongodb in PHP?

Here i know, i can create the document variable when using another run time query (using $set or else). But i need to create document variable, when i insert.

If i create document variable like following,

$a = array();
$db->user->insert(array('report'=> $a));

following code is not working,

$db->user->update(
    array('user' => $user ), 
    array('$set' => array(
        'report.' . $number => 
             array('id'=>$number, 'on' => time(), 'status'=> 0)
    )));

here, $number is string variable.

What happens if you pass along an empty array() as in your example? This should work and store an empty document. — SaschaM78
– SaschaM78, Commented Jan 3, 2013 at 10:30
@SaschaM78 It is? Have you got a page explaining a Document field type? — Sammaye
– Sammaye, Commented Jan 3, 2013 at 10:40
@SaschaM78 That: docs.mongodb.org/manual/reference/glossary/#term-bson-types is actually the list of types that BSON Documents support. — Sammaye
– Sammaye, Commented Jan 3, 2013 at 10:48

KarSho · Accepted Answer · 2013-01-16 13:17:03Z

4

Finally no way for my question. I searched in many way. So, We can create the document variable when using another run time query (using $set or else). Thanks.

answered Jan 16, 2013 at 13:17

KarSho

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Sammaye · Accepted Answer · 2013-01-03 11:04:00Z

0

The MongoDB PHP driver supports sending in empty objects (it has no validation on it's end to make sure you send something of value) to be saved but detecting that this method of saving objects would be useless without knowing the _id of the object you have just saved you can do:

$a = array();
$db->user->insert($a);
var_dump($a['_id']);

Since if passed a variable, the insert function for MongoDB will modify (by reference) the original variable and add the _id field to it.

You cannot save a "empty" object however (an object without the immutable _id) to a normal collection. This of course differs for things like capped collections.

answered Jan 3, 2013 at 11:04

Sammaye

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2 Comments

KarSho Over a year ago

So What? What you meant by brackets?

Sammaye Over a year ago

@KarSho Yea so where you see 3 brackets on the last line of your edit there is only supposed to be two. Can you show us an example doc of what your updating and and can you tell us what $user is? Are you sure this actually finds a doc?

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