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I have a sub array which consists of object ids

 "selections" : ["5176d1f09de5ee2808028da9", "5176d1f09de5ee2808028e4d", "5176d1f09de5ee28080292fe", "5176d1f19de5ee2808029867"]

When users log in, these are registered using PHP sessions:

var_dump($selections);

array(16) { [0]=> string(24) "5176d1f09de5ee2808028a7c" [1]=> string(24) "5176d1f09de5ee2808029180" [2]=> string(24) "5176d1f09de5ee2808029283" [3]=> string(24) "5176d1f19de5ee280802990c"}

I get them from sessions and then use them in a query:

$selectionsFromSession= $_SESSION['selections'];

$list=$collection->find(array("_id"=>array('$in'=>  $selectionsFromSession )), ....

This query returns nothing. What can be the problem here?

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1 Answer

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You need to instantiate the MongoId Object.

foreach( $selections as &$selection ) {
    $selection = new \MongoId( $selection );
}

You then pass the array of instantiated objects to your query.

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should I do it before registering to sessin or just before querying? – mustafa Apr 23 at 19:57
before querying – Howard Apr 23 at 19:58
I think still returns empty – mustafa Apr 23 at 20:01
Try var_dumping the entire array being sent to your query. That is, the _id and $in included. – Howard Apr 23 at 20:04
seems there is just one id passing to query var_dump($selection); object(MongoId)#19 (1) { ["$id"]=> string(24) "5176d1f99de5ee2808030b59" } – mustafa Apr 23 at 20:09
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