Doctrine_Record::contains PHP Méthode

    public function contains($fieldName)
    {
        if (array_key_exists($fieldName, $this->_data)) {
            // this also returns true if the field is a Doctrine_Null.
            // imho this is not correct behavior.
            return true;
        }
        if (isset($this->_id[$fieldName])) {
            return true;
        }
        if (isset($this->_values[$fieldName])) {
            return true;
        }
        if (isset($this->_references[$fieldName]) && $this->_references[$fieldName] !== self::$_null) {
            return true;
        }
        return false;
    }