Sorting up updatedAt mongoDB - node.js

Question

So on my webpage www.groupwrites.com I am showing an Index of stories in the "Read" page. These stories currently show in the order of which they were created (i.e the newest ones on bottom). I am trying to figure out how to display them with the most recently created/updated one first. I am using mongoDB, node JS on cloud9. I have been trying to research and know that I should use updatedAt but I am not sure how to plug everything in. I am not sure how to update the timestamp for updatedAt in the put routes.
This is my code for the index:
// INDEX - show all stories
router.get("/browse", function(req, res, next){
// Get all stories from DB
Story.find({}, function(err, allStories){
if (err) {
return next(err);
} else {
// if user is logged in then render stories and any alerts
if(req.user) {
User.findById(req.user._id).populate({
path: 'alerts',
model: 'Alert',
match: { 'isRead': { $eq: false }}
}).exec(function(err, user) {
if(err) {
return next(err);
}
res.render("stories/index", {stories:allStories, alerts: user.alerts.length, page: 'browse'});
});
} else {
res.render("stories/index", {stories:allStories})
}
}
})
})
// CREATE - add new story to DB
router.post("/browse", middleware.isLoggedIn, function(req, res, next){
// get data from form and add to stories array
var title = req.body.title
var image = req.body.image
var desc = req.body.description
var category = req.body.category
var author = {
id: req.user._id,
username: req.user.username
}
var newStory = {title: title, image: image, description: desc, author: author, category: category}
// Create a new story and save to database
Story.create(newStory, function(err, newlyCreated){
if (err) {
return next(err);
} else {
// redirect back to stories page
req.flash("success", "Successfully published story!")
res.redirect("/browse")
}
})
})
This is the code for the content of the stories, (i.e when adding a chapter to the story):
// New Content
router.get("/stories/:id/content/new", middleware.isLoggedIn, function(req, res, next){
// Find story by id
Story.findById(req.params.id, function(err, story){
if (err) {
return next(err);
} else {
res.render("content/new", {story: story})
}
})
})
// Create Content
router.post("/stories/:id/content", middleware.isLoggedIn, function(req, res, next){
// Look up story using ID
Story.findById(req.params.id).populate({path: 'subscribors', model: 'User'}).exec(function(err, story){
if (err) {
return next(err);
} else {
Content.create(req.body.content, function(err, content){
if (err) {
return next(err);
} else {
if(story.subscribors.length) {
var count = 0;
story.subscribors.forEach(function(subscribor) {
// create alert for each subscribor and add to subscribor's alerts
Alert.create({follower: story.author.id, followed: subscribor, story: story, isUpdated: true}, function(err, newAlert) {
if(err) {
return next(err);
}
// console.log(newAlert);
subscribor.alerts.push(newAlert);
subscribor.save();
count+=1;
if(count === story.subscribors.length) {
// Add username and ID to content
content.author.id = req.user._id;
content.author.username = req.user.username;
// Save content
content.save();
story.content.push(content);
story.save();
req.flash("success", "Successfully added chapter!");
return res.redirect("/stories/" + story._id);
}
});
});
} else {
// Add username and ID to content
content.author.id = req.user._id;
content.author.username = req.user.username;
// Save content
content.save();
story.content.push(content);
story.save();
req.flash("success", "Successfully added chapter!");
return res.redirect("/stories/" + story._id);
}
}
});
}
});
});
// Content Edit Route
router.get("/stories/:id/content/:content_id/edit", middleware.checkContentOwnership, function(req, res){
Content.findById(req.params.content_id, function(err, foundContent){
if(err){
res.redirect("back")
} else{
res.render("content/edit", {story_id: req.params.id, content: foundContent})
}
})
})
// Content Update
router.put("/stories/:id/content/:content_id", middleware.checkContentOwnership, function(req, res){
Content.findByIdAndUpdate(req.params.content_id, req.body.content, function(err, updatedContent){
if(err){
res.redirect("back")
} else {
req.flash("success", "Successfully edited chapter!")
res.redirect("/stories/" + req.params.id)
}
})
})

Answer 1

While defining a Mongoose Schema,
1 for ascending and -1 for descending
Example:
"use strict";
var mongoose = require('mongoose');
var db= require('mongoose').models;
let findOrCreate = require('findorcreate-promise');
var abc= new mongoose.Schema({
name: String,
updated_At: { type: Date, default: Date.now } // like this you can define
});
mongoose.model('abc', abc);
and you can use this by :
db.abc.find({})
.sort({'updated_At':1}) //1 for ascending and -1 for descending
.exec(Your callback function)
this will make sorting from smallest updated_At date to largest.
Thanks