Code for https://wondersofcode.wordpress.com/?p=120, part 1

FitbitUserRepository_original.js

var Q = require('q');
var mongoFacade = require('mongoFacade');

/** For each user in our DB, fetch her stats from Fitbit */
var getUsersWithFitbitStats = function(){
  var deferred = Q.defer();

  //get stats for all users:
  var userStats = [];

  mongoFacade.find({}, function(err, users){ // Async fetch from DB
    users.forEach(function(user){
      Auth.oauth.getProtectedResource(
        'https://api.fitbit.com/1/user/-/activities.json',
        'GET',
        user.oauthAccessToken,
        user.oauthAccessTokenSecret,
        function (error, data, response) { // Async fetch stats from Fitbit

          if (error) {
            logError(error, user);
            return;
          }

          var responseData = JSON.parse(data);
          var steps = responseData.lifetime.total.steps;

          userStats.push({
            user: {
              id: user.fitbitId,
              name: user.name
            },
            data: responseData
          });

          //complete promise if this is the last element in array:
          if (users.indexOf(user) === users.length-1) {
            return deferred.resolve(userStats);
          }
        }
      );
    });
  });
  return deferred.promise;
};

module.exports = {
  getUsersWithFitbitStats: getUsersWithFitbitStats
};