ProjectController.js

'timeline': function(req, res){

  	Project.findOne(req.param("id"))
  	.populate("discussions")
  	.populate("moodboards")
  	.exec(function(err, project){

  		var retval = [];

  		//First, do all the stuff for discussions
  		async.forEach(project.discussions, function(discussion, cb){

  			var object = {
  				origin: "discussion",
  				action: "create",
  				createdAt: discussion.createdAt,
  				source: discussion
  			};

  			User.findOne(discussion.creator)
  			.exec(function(err, user){
  				object.creator = user;
  				retval.push(object);
  				cb();
  			})
  		}, function(err){

  			async.forEach(project.moodboards, function(moodboard, cb){

  				//Start building the event
  				var object = {
	  				origin: "moodboard",
	  				action: "create",
	  				createdAt: moodboard.createdAt,
	  				source: moodboard
	  			};

	  			//Attatch the creator
	  			User.findOne(moodboard.creator)
	  			.exec(function(err, user){
	  				object.creator = user;
	  				retval.push(object);
	  				

	  				//Check to see if there are any images to include

	  				MoodboardImage.find({
	  					moodboard: moodboard.id
	  				})
	  				.populate("creator")
	  				.exec(function(err, moodboardimages){

	  					var grouped_images = _.groupBy(moodboardimages, function(image){
	  						var created = image.createdAt;
	  						return created.getDay().toString() + "-" + created.getHours().toString();
	  					})

	  					_.each(grouped_images, function(group){

	  						var group = _.groupBy(group, function(image){
	  							return image.creator.id
	  						})

	  						_.each(group, function(update){
	  							var object = {
		  							origin: "moodboard",
		  							action: "update",
		  							createdAt: update[0].createdAt,
		  							images: update,
		  							moodboard: moodboard,
		  							creator: update[0].creator
		  						}
		  						retval.push(object);
	  						})

	  					})

	  					cb();

	  				})
	  			})

  			}, function(err){
  				res.send(_.sortBy(retval, "createdAt").reverse());
  			})

  		})

  	})
  },