What is the correct way to use $push in PHP in MongoDB?

Question

NoSQL

Data:

{
"Key" : $key,
"BlueGroup" : {
        "1469132000" : {
            "X" : 1.2,
            "Y" : 3.3,
            "Z" : 2.1
        }
},
"ManyGroups" : { * }
}

My task is to add new values ​​to the group (BlueGroup) after the old ones.

$collection -> update(
        array( 'key'            => $key ),
        array( '$push'          => array(
                  'BlueGroup'   => array(
                    time()      => array(
                        'X'     => $i->X,
                        'Y'     => $i->Y,
                        'Z'     => $i->Z
                    )
                 )
                )
        )
    );

Judging by the documentation, $push does not work for me, since the "BlueGroup" has already been created in the document. Can you please tell me how to do this command?

Answer 1

BlueGroup must be an array:

{
"Key" : $key,
"BlueGroup" : [
     {
        "1469132000" : {
            "X" : 1.2,
            "Y" : 3.3,
            "Z" : 2.1
        }
     }
],
"ManyGroups" : { * }
}