model

gistfile1.js

UserController.prototype.getUserFeed = function(request, response, next) {
  var _id = request.params._id;
  var context = this;

  this.model.findOneAsync(_id)
    .then(handleNotFound)
    .then(function(user) {
      return user;
    })
    .then(function(user) {
      context.model.findAsync({_id: {$in: user.following}})
      .then(function(followingUser) {
        var userFeed = [];
        
        var followingUsersPics = function(followingUser) {
          userFeed = _.concat(userFeed, followingUser.pics)
        };

        followingUser.map(followingUsersPics);

        response.status(200);
        response.json({feed: userFeed})
      })
      .catch(next);
    })
    .catch(next);
};