express.js web app

var express     = require("express");
var router      = express.Router();
var Blog        = require("../models/blogpost");
var multer      = require("multer");
var async       = require("async");

//Multer Storage
var storage = multer.diskStorage({
    filename: function(req, file, callback){
        callback(null, Date.now()+ file.originalname);

}});

//Multer Filter
var imageFilter = function(req, file, cb){
    // accept only image files
    if(!file.originalname.match(/\.(jpg|jpeg|png|gif)$/i)){
        cb(new Error('only image files are allowed'), false);
        }
        cb(null, true);
};

//Storing Image + Filter
var upload  = multer({storage: storage, fileFilter: imageFilter});

//Cloudinary Configuration
var cloudinary = require("cloudinary");
 cloudinary.config({
    cloud_name: 'dnposhqpc',
    api_key: process.env.CLOUDINARY_API_KEY,
    api_secret: process.env.CLOUDINARY_API_SECRET
});


//------Routes----
//---------------/


// INDEX ROUTE TO SHOW ALL BLOG POST
router.get("/", function(req, res) {
    Blog.find({}, function(err, blogs){
        if(err){
            console.log("Error");

        } else {
            res.render('blog/index', {blogs: blogs});
        }

    });

});

// New Route---/

router.get("/new", function(req, res){
    res.render("blog/new");
});

//Create New Blog
router.post("/", upload.single('image'), function(req, res){
    var title = req.body.title;
    var image = req.body.image;
    var imageId = req.body.imageId;
    var body    = req.body.body;

    cloudinary.uploader.upload(req.file.path, function(result){
        image = result.secure_url;
        imageId = result.public_id;


    var newBlog = {title: title, image: image, imageId: imageId, body: body};
    Blog.create(newBlog, function(err, newpost){
        if(err || !newpost){
            console.log('error');
        } else {
            console.log('newpost');
            res.redirect("/blog");
        }
    });
    });
})
// SHOW ROUTE
router.get("/:id", function(req, res) {
    Blog.findById(req.params.id, function(err, foundBlog){
        if(err){
            console.log('error');
            res.redirect("/blog");
        } else {
            res.render("blog/show", {blog: foundBlog});
        }
    });
});

// EDIT ROUTE
router.get("/:id/edit", function(req, res) {
    Blog.findById(req.params.id, function(err, foundBlog){
        if(err) {
            console.log('error');
            res.redirect("/blog");
        } else {
          res.render("blog/edit", {blog: foundBlog});
        }
    });

});

// UPDATE ROUTE
router.put("/id", upload.single('image'), function(req, res, next){
    var title = req.body.title;
    var image = req.body.image;
    var imageId = req.body.imageId;
    var body    = req.body.body;
    var blog = {title: title, image: image, imageId: imageId, body: body};
    async.waterfall([
    function(data, done) {
            // handle image uploading
            Blog.findById(req.params.id, function(err, updateblog) {
                if(err || !updateblog) {
                    console.log(err);
                     req.flash("error", err.message);
                     return res.redirect("back");
                }  else {
                    done(null, updateblog, data);
                }
            });
        },

        function(updateblog, data, done) {
            if(req.file) {
                cloudinary.v2.uploader.destroy(updateblog.imageId, function(err, result) {
                    if(err) {
                        req.flash("error", err.message);
                        return res.redirect("back");
                    } else {
                        done(null, updateblog, data);
                    }
                });
            } else {
                done(null, updateblog, data);
            }
        },
     function(updateblog, data, done) {
            // if new image uploaded, destroy the old one
            if(req.file) {
                cloudinary.uploader.upload(req.file.path, function(result) {
                    req.body.blog.imageId = result.public_id;
                    req.body.blog.image = result.secure_url;
                    done(null, updateblog, data);
                });
            } else {
                done(null, updateblog, data);
            }
        },

    Blog.findByIdAndUpdate(req.params.id, req.body.blog, function(err, blog){
        if(err) {
            console.log('error');
            res.redirect("/blog");
        } else {
            res.redirect("/blog/" + req.params.id);
        }
    })
]);
})





module.exports  = router;
//----------------------------------
//===== Edit.ejs
<% include ../partials/blogheader %>

<div class="ui main text container segment">

<div class="ui huge header"> Edit <%= blog.title %></div>
 <!--<div style="width: 30%; margin: 0 auto;">-->

   <form class="ui form" action="/blog/<%= blog._id %>?_method=PUT" method="POST" enctype="multipart/form-data">
      <div class="field">
          <label for="title">Title</label>
          <input  type="text" name="title" value="<%= blog.title %>">
       </div>
         <div class="field">
           <label for="body">Message</label>
             <textarea name="body" row="3"><%= blog.body %></textarea>
        </div>
          <div class="field">
             <label for="image">Image</label>
              <input type="file" id="image" name="image" value="<%= blog.image %>">
           </div>

           <div class="field">
             <button class="ui blue basic big button">Edit</button>
      </div>



  </form>
  <a href="/">Go Back</a>
</div>

</div>