/**
     * deBSON() -- private method
     *
     * MongoDB has a problem fetching data as it tends to BSON serialize all properties within a record for
     * non-packed record arrays.  So, this method, which is recursive, takes the current data payload of N-records,
     * and traverses all the records looking for declared array fields (fieldTypes).
     *
     * When found, that field type is force-cast to type = array and, if the field itself is another array, such
     * as a sub-collection, the method will recursively call itself.
     *
     * As of this time, version 1.0.0, this method is only called from the _fetchRecords() method.
     *
     * @author  mike@givingassistant.org
     * @version 1.0
     *
     * @param $_data
     *
     * HISTORY:
     * ========
     * 08-29-17     mks     CORE-494: original coding
     * 11-26-18     mks     DB-55: added error processing if a key is not a member of the current class
     *
     */
    private function deBSON(&$_data)
    {
        if (is_array($_data) and array_key_exists(0, $_data)) {
            for ($index = 0, $limit = count($_data); $index < $limit; $index++) {
                foreach ($_data[$index] as $column => &$value) {
                    if ($this->fieldTypes[$column] == DATA_TYPE_ARRAY) {
                        if (!is_scalar($value)) {
                            foreach ($value as &$rec) {
                                if (!is_scalar($rec)) $rec = (array) $rec;
                            }
                            $this->deBSON($value);
                        }
                        $_data[$index][$column] = (array) $value;
                    }
                }
            }
        } elseif (is_array($_data)) {
            foreach ($_data as $key => $val) {
                if (array_key_exists($key, $this->fieldTypes) and $this->fieldTypes[$key] == DATA_TYPE_ARRAY) {
                    if (is_array($val))
                        $this->deBSON($val);
                    $_data[$key] = (array) $val;
                } elseif (!array_key_exists($key, $this->fieldTypes)) {
                    $msg = ERROR_DATA_FIELD_NOT_MEMBER . $key;
                    $this->eventMessages[] = sprintf(STUB_LOC, basename(__FILE__),__METHOD__, __LINE__) . COLON . $msg;
                    $this->logger->data($msg);
                }
            }
        }
    }