title: Mongoose/MongoDB: Can I update a document if I have a reference to it already without a query?
body: <p>I perform <code>db.collection.findOne( {query}</code>... In the callback, if I successfully find an object, I want to modify one of it's properties... </p>
  
  <pre><code>,function(err, obj){
      //is there a better way to do this since I already have a reference to the object? Searching the docs always gives me db.collection APIs
      db.collection.update( {_id: obj._id }, { modifications}, function(err, obj){ ... }
  }
  </code></pre>