This is a PHP Class that can be extended if you would like make individual models/domain classes for your collection.
class Article extends MongoModel {
public function __construct(){
parent::__construct("article");
}
public function hasArticle($link) {
$article = $this->find(
array('url' => $link)
);
return (is_array($article) && count($article) > 0);
}
}