Doctrine\ODM\MongoDB\Mapping\Driver\XmlDriver::addFieldMapping PHP Метод

    private function addFieldMapping(ClassMetadataInfo $class, $mapping)
    {
        if (isset($mapping['name'])) {
            $name = $mapping['name'];
        } elseif (isset($mapping['fieldName'])) {
            $name = $mapping['fieldName'];
        } else {
            throw new \InvalidArgumentException('Cannot infer a MongoDB name from the mapping');
        }
        $class->mapField($mapping);
        // Index this field if either "index", "unique", or "sparse" are set
        if (!(isset($mapping['index']) || isset($mapping['unique']) || isset($mapping['sparse']))) {
            return;
        }
        $keys = array($name => isset($mapping['order']) ? $mapping['order'] : 'asc');
        $options = array();
        if (isset($mapping['background'])) {
            $options['background'] = (bool) $mapping['background'];
        }
        if (isset($mapping['drop-dups'])) {
            $options['dropDups'] = (bool) $mapping['drop-dups'];
        }
        if (isset($mapping['index-name'])) {
            $options['name'] = (string) $mapping['index-name'];
        }
        if (isset($mapping['safe'])) {
            $options['safe'] = (bool) $mapping['safe'];
        }
        if (isset($mapping['sparse'])) {
            $options['sparse'] = (bool) $mapping['sparse'];
        }
        if (isset($mapping['unique'])) {
            $options['unique'] = (bool) $mapping['unique'];
        }
        $class->addIndex($keys, $options);
    }