please help me, What does the equivalent in mongoDB to return an array which contains the field name?

please help me, What does the equivalent in mongoDB to return an array which contains the field name? - Printable Version

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please help me, What does the equivalent in mongoDB to return an array which contains the field name? - El Forum - 02-02-2012

[eluser]zacksyah[/eluser]
mysql function in Codeigniter I Use list_field() to return an array containing the field names. What does the equivalent in mongoDB to return an array which contains he field name? This code below I use the list_field function

Code:
function GetField($execution) {

    $query = $this->db->query($execution);

    if ($query->num_rows() > 0) {

        return $query->list_fields();

    } else {

        return array();

    }

}

My goal is if there is input with complex queries, the field appears dynamically in accordance with the input query like using phpmyadmin in MySQL & rockmongo in mongoDB.
If there is no equivalent query in MongoDB, Is there a trick to solve my problem?
thanks in advance