doctrine / mongodb-odm

        if (isset($reference->{'default-discriminator-value'})) {

            $mapping['defaultDiscriminatorValue'] = (string) $reference->{'default-discriminator-value'}['value'];

        }

        if (isset($reference->{'sort'})) {

            foreach ($reference->{'sort'}->{'sort'} as $sort) {

                $attr = $sort->attributes();

                $mapping['sort'][(string) $attr['field']] = (string) ($attr['order'] ?? 'asc');

            }

        }

        if (isset($reference->{'criteria'})) {

            foreach ($reference->{'criteria'}->{'criteria'} as $criteria) {

                $attr = $criteria->attributes();

        if (isset($attributes['also-load'])) {

            $mapping['alsoLoadFields'] = explode(',', $attributes['also-load']);

        }

        if (isset($reference->{'prime'})) {

            foreach ($reference->{'prime'}->{'field'} as $field) {

                $attr = $field->attributes();

                $mapping['prime'][] = (string) $attr['name'];

            }

        }

        $this->addFieldMapping($class, $mapping);

    }