/**
* Clear the specified collection and populates it with the $json
*
* $json should be a JSON encoded array of documents
*
* @param string $collectionName
* @param string $json
* @return boolean
*/
public function loadJsonStringDatasetIntoCollection($collectionName, $json)
{
$collection = $this->getDatabase()->selectCollection($collectionName);
$loader = new JsonLoader($collection);
return $loader->loadJsonFromString($json);
}