Use aggregate method with the new MongoDB driver classes in PHP - php

Question

I am new with mongo.
I try to get a subDocument of a document, here is my document :
{
"_id" : ObjectId("5900ab35c720b210c000032c"),
"name" : "B 1",
"providers" : [
{
"id" : ObjectId("59030550c720b211dc005e9e"),
"name" : "F 1"
},
{
"id" : ObjectId("59030577c720b211dc005e9f"),
"name" : "F 2"
}
]
}
and I want to get this subDocument :
{
"id" : ObjectId("59030577c720b211dc005e9f"),
"name" : "F 2"
}
I think I need to use these class : http://php.net/manual/en/mongocollection.aggregate.php but I didn't manage to use it with my manager instance of the class : http://php.net/manual/en/class.mongodb-driver-manager.php.
The PHP Manual do not show how to use it with the new Driver.
Can someone help me?
Thank you and Good Day !

Answer 1

You don't have to use aggregation for the task.
You can use regular queries for selecting the first matching sub document in the embedded arrays.
You can approach it in a couple of ways.
$Positional Projection
$filter = ['_id' => new MongoDB\BSON\ObjectID("5900ab35c720b210c000032c"), 'providers.id' => new MongoDB\BSON\ObjectID("59030577c720b211dc005e9f") ];
$options = ['projection' => ['_id' => 0, 'providers.$' => 1],];
$elemMatch Projection
$filter = ['_id' => new MongoDB\BSON\ObjectID("5900ab35c720b210c000032c")];
$options = [
'projection' => ['_id' => 0, 'providers' => ['$elemMatch'=> ['id' => new MongoDB\BSON\ObjectID("59030577c720b211dc005e9f")]]],
];
You'll use the executeQuery to run regular queries.
$query = new \MongoDB\Driver\Query($filter, $options);
$cursor = $manager->executeQuery(dbName.collectionName, $query);