title: How to access oplog in mongoose.js?
body: <p>I have app that is using <code>mongoose.js</code>. 
  Till now I was using single instance of <code>mongod</code>. But recently I changed to replica set. </p>
  
  <p>How I can access in mongoose.js the oplog collection? I mean how I can get collection from another db (<code>local</code>)? So let's say I am connected to db and have <code>mongoose.connection</code> - How I can query oplog now?</p>