Sokil\Mongo\Document::getCollection PHP Method

    public function getCollection()
    {
        return $this->collection;
    }

 /**
  * @return \Sokil\Mongo\Collection
  */
 private function getRevisionsCollection()
 {
     if ($this->revisionsCollection) {
         return $this->revisionsCollection;
     }
     $collection = $this->document->getCollection();
     $revisionsCollectionName = $collection->getName() . self::REVISION_COLLECTION_SUFFIX;
     $this->revisionsCollection = $collection->getDatabase()->map($revisionsCollectionName, array('documentClass' => '\\Sokil\\Mongo\\Revision'))->getCollection($revisionsCollectionName);
     return $this->revisionsCollection;
 }