as3io / modlr-persister-mongodb

            $subKey = $parts[0];

        }

        if ($this->isIdentifierField($subKey)) {

            // Handle like a regular relationship

            list($key, $value) = $this->formatQueryElementRel($root, $value, $metadata, $store);

            $key = (true === $hasIndex) ? sprintf('%s.%s', $key, $parts[0]) : $key;

            return [$key, $value];

        }

        if ($this->isTypeField($subKey)) {

            // Handle as a model type field.

            return [$key, $value];

        }

        if ($this->isTypeField($subKey)) {

            // Handle as a model type field.

            list($key, $value) = $this->formatQueryElementRoot($subKey, $value, $metadata);

            $key = (true === $hasIndex) ? sprintf('%s.%s.%s', $root, $parts[0], $key) : sprintf('%s.%s', $root, $key);

            return [$key, $value];

        }

        return [$key, $value];

    }