title: Sync solr documents with database records
body: <p>I wonder there is a proper way to solr documents with sync database records. I usually have problems: there is solr documents while there are no database records referent by solr. It seems some db records has been deleted, but no trigger has been to update solr. I want to write a rake task to remove documents in solr that run periodically.</p>
  
  <p>Any suggestions?</p>
  
  <p>Chamnap</p>