title: Result from mongoose query unavailable in parent scope
body: <p>I'm new to javascript and node and am having trouble returning the result from a mongoose query to an object I can work with.  My app currently parses the body of a post request into cache, uses a field in the cached object (mlcRecord.existFixture) to query the database, and returns an object from which to grab additional properties.  This part of the code works fine.  However, the additional properties are undefined outside of the .then scope.</p>
  
  <p>I'm sure I'm missing something basic so any guidance folks can provide is appreciated.</p>
  
  <pre><code>router.route('/mlc')
  .post(function (req,res){
     var mlcRecord = new mlcInputObj(req.body);
     async.series([
        function (callback) {
          function setWattages(mlcRecord) {
  
          // load the existFixture TechnologyID
          ltgTechnologies.findOne({TechnologyID: mlcRecord.existFixture}).exec()
  
          // capture the technologyID 
              .then(function(ltgTechnology){
                  mlcRecord.existFixtureWatts = ltgTechnology.SystemWatts;
                  return mlcRecord;
              });
          }
  
          setWattages(mlcRecord);
  
          console.log('mlcRecord: ', mlcRecord);  // existFixtureWatts displays as undefined
          callback();
       }
     ], function (err) {
      res.json(mlcRecord);
     });
  });
  </code></pre>