Inheritance: implements Doctrine\ODM\CouchDB\Mapping\MetadataResolver\MetadataResolver
 /**
  * @param  array $documentData
  * @return mixed
  */
 public function getDocumentType(array $documentData)
 {
     if (in_array($documentData['type'], $this->typeMap)) {
         return $this->typeMap[$documentData['type']];
     } else {
         return parent::getDocumentType($documentData);
     }
 }