DEV Community: Sanket N Jain

Caught an error while pushing a product to cart. TypeError: Cannot read property 'push' of undefined

Sanket N Jain — Fri, 16 Oct 2020 11:40:15 +0000

Caught an error while pushing a product to cart. TypeError: Cannot read property 'push' of undefined

Oct 16 '20 Comments: 1 Answers: 0

I want to push the product details into the cart model when a user clicks on "add to cart" button on a particular product. But it shows TypeError: Cannot read property 'push' of undefined

Here is the route file:

router.post("/product/:id/addCart", isLoggedIn, function(req, res){
const quantity = req.body.quantity
Product.findById(req.params.id, function(err, foundProduct){

…

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How to write multiple queries in mongoose?

Sanket N Jain — Tue, 06 Oct 2020 01:00:01 +0000

I have written this query but it is not correct.

router.get("/product/:name", function(req, res){
Product.findById(req.params.name).populate("reviews").exec(function(err, foundProduct){
    if(err){
        console.log(err);
    }
    else{
        foundProduct.aggregate([{"$lookup": {"from": "reviews", "localField": "reviews", "foreignField": "_id", "as": "reviews"}}, {"$unwind": "$reviews"}, {"$group": {"_id": null, "ratingAvg": {"$avg": "$reviews.rating"}}}], function(err, result){
        if(err){
            console.log(err);
        }
        else{
            result.forEach(function(element){
                var rate = Math.round(element.ratingAvg);
                foundProduct.updateOne({avgRating: rate});
                res.render("product", {product: foundProduct});
            });
        }
    })
    }
})
})

Here is what I want:

Find the product with that id
populate the reviews in the product model associated with that product id
calculate the average rating by taking all the ratings associated with that product id
as the default avgRating in the product model is zero, so update the avgRating with the average rating calculated in the previous step.
now render the foundProduct which contains the updated avgRating.

Here is the product model:

var productSchema = new mongoose.Schema({
category: String,
name: String,
price: Number,
image: String,
description: String,
stock: Number,
avgRating: {type: Number, default: 0},
reviews: [
    {
        type: mongoose.Schema.Types.ObjectID, ref: 'Review'
    }
]
})

Attempted import error: 'combinedReducers' is not exported from 'redux'.

Sanket N Jain — Sun, 13 Sep 2020 07:51:36 +0000

import {createStore, combinedReducers, applyMiddleware, compose} from 'redux';
import {productListReducer} from './reducers/productReducers';
import thunk from 'redux-thunk'

const initialState = {};
const reducer = combinedReducers({
    productList: productListReducer
})

const composeEnhancer = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
const store = createStore(reducer, initialState, composeEnhancer(applyMiddleware(thunk)));
export default store;

Can you help me with the implementation of algorithms for my project?

Sanket N Jain — Fri, 04 Sep 2020 01:54:07 +0000

I'm doing an e-commerce website for my college project. And it's almost done. Now I have to add search and product recommendations algorithms in my website. I have no idea what language to use and how to implement it.

Is it possible to add augmented reality to a website?

Sanket N Jain — Wed, 05 Aug 2020 05:42:27 +0000

I am making a website and I'm planing to include augmented reality which uses both desktop webcam or camera in mobile. I want to make something like Instagram filters but it's totally different. And what do I need to learn for that?

A data breach on a site exposed your password

Sanket N Jain — Wed, 15 Jul 2020 06:16:20 +0000

I have added authentication to my website and it shows a message as shown in the picture when I login or signup. And also I have an option called "Add Comment", which opens only if the user is logged in or else it redirects to the login page. But here when I login and click on the "Add Comment" button it still redirects to the login pageant it doesn't show me the Add Comment page.

Authentication routes:

app.get("/register", function(req, res){
    res.render("register");
})

app.post("/register", function(req, res){
    User.register(new User({username: req.body.username}), req.body.password, function(err, user){
        if(err){
            console.log(err);
            return res.render("register");
        }
        else{
            passport.authenticate("local")(req, res, function(){
                res.redirect("/campgrounds");
            })
        }
    })
})

app.get("/login", function(req, res){
    res.render("login");
})

app.post("/login", passport.authenticate("local", {
    successRedirect: "/campgrounds",
    failureRedirect: "/login"
}), function(req, res){
})

app.get("/logout", function(req, res){
    req.logout();
    res.redirect("/")
})

function isLoggedIn(req, res, next){
    if(req.isAuthenticated()){
        return next();
    }
    res.redirect("/login");
}

Comment Route:

app.get("/campgrounds/:id/comments/new", isLoggedIn, function(req, res){
    Campground.findById(req.params.id, function(err, campground){
        if(err){
            console.log(err);
        }
        else{
            res.render("comments/new", {campground: campground});
        }
    })
})

app.post("/campgrounds/:id/comments", isLoggedIn, function(req, res){
    Campground.findById(req.params.id, function(err, campground){
        if(err){
            console.log(err);
            res.redirect("/campgrounds");
        }
        else{
            Comment.create(req.body.comment, function(err, comment){
                if(err){
                    console.log(err);
                }
                else{
                    campground.comments.push(comment);
                    campground.save();
                    res.redirect("/campgrounds/" + campground._id);
                }
            })
        }
    })
})

Help me with this error "internal/modules/cjs/loader.js:638"

Sanket N Jain — Fri, 10 Jul 2020 11:56:30 +0000

I'm tired of searching a solution for this error but it seems that no one has a proper solution. It is unable to find campground.js file in the models directory. I even tried reinstalling npm, but no luck.

I have my campground.js file in the models directory and I'm not able to run my app.js file.

Help me with the display of the url

Sanket N Jain — Wed, 08 Jul 2020 16:07:11 +0000

I have a blog and when I want to edit a post the URL becomes "/blog/:title/edit" and when I change the title of the blog and hit submit the URL should become "/blog/:title" and take me to the updated post. But this doesn't happen because when the title is updated in database the ":title" in the URL will not be updated. So my problem is when I click on the submit button the URL should change from "/blog/:title/edit" to "/blog/:newTitle"

Here is the Express code:

var express = require("express"),
    methodOverride = require("method-override"),
    bodyParser = require("body-parser"),
    mongoose = require("mongoose"),
    app = express();

mongoose.connect("mongodb://localhost:27017/blog", {useNewUrlParser: true, useUnifiedTopology: true, useFindAndModify: false});
app.use(bodyParser.urlencoded({extended: true}));
app.set("view engine", "ejs");
app.use(express.static("public"));
app.use(methodOverride("_method"));

var blogSchema = new mongoose.Schema({
    title: String,
    image: String,
    body: String,
    created: {type: Date, default: Date.now}
})

var Blog = mongoose.model("Blog", blogSchema);

app.get("/", function(req, res){
    res.redirect("/blog");
})

app.get("/blog", function(req, res){
    Blog.find({}, function(err, blog){
        if(err){
            console.log(err);
        }
        else{
            res.render("index",{blog: blog});
        }
    })
})

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

app.post("/blog", function(req, res){
    Blog.create(req.body.blog, function(err, newBlog){
        if(err){
            res.render("new");
        }
        else{
            res.redirect("/blog");
        }
    })
})

app.get("/blog/:title", function(req, res){
    Blog.findOne({title: req.params.title}, function(err, foundBlog){
        if(err){
            res.redirect("/blog");
        }
        else{
            res.render("show", {blog: foundBlog});
        }
    })
})

app.get("/blog/:title/edit", function(req, res){
    Blog.findOne({title: req.params.title}, function(err, foundBlog){
        if(err){
            res.redirect("/blog");
        }
        else{
            res.render("edit", {blog: foundBlog});
        }
    })
})

app.put("/blog/:title", function(req, res){
    Blog.findOneAndUpdate({title: req.params.title}, req.body.blog, function(err, updatedBlog){
        if(err){
            res.redirect("/blog");
        }
        else{
            res.redirect("/blog/"+req.params.title);
        }
    })
})

app.listen(3000, function(){
    console.log("server listening at port 3000");
})

And here is the edit.ejs code:

<%- include("partials/header") %>

<div class="ui main text container segment">
    <div class="ui huge header">Edit <%= blog.title %></div>
    <form class="ui form" action="/blog/<%= blog.title %>?_method=PUT" method="POST">
        <div class="field">
            <label>Title</label>
            <input type="text" name="blog[title]" value="<%= blog.title %>">
        </div>
        <div class="field">
            <label>Image</label>
            <input type="text" name="blog[image]" value="<%= blog.image %>">
        </div>
        <div class="field">
            <label>Blog Content</label>
            <textarea name="blog[body]"><%= blog.body %></textarea>
        </div>
        <input class="ui violet big inverted button" type="submit">
    </form>
</div>

<%- include("partials/footer") %>

I am getting undefined object when I use req.query.search in express

Sanket N Jain — Fri, 03 Jul 2020 05:41:38 +0000

node js code:

var express = require("express");
const axios = require("axios");
var app = express();

app.set("view engine", "ejs");

app.get("/", function(req, res){
    res.render("search");
});

app.get("/results", async function(req, res){
    var Search = req.query.search;
    console.log(Search);
    var url = 'http://www.omdbapi.com/?s='+Search+'&apikey=thewdb';
    try{
        const response = await axios.get(url);
        res.render("results", {data:response.data});
    }
    catch(err){
        console.log(err);
    }
});

app.listen(3000, function(){
    console.log("sever listening to port 3000");
});

search.ejs code:

<h1>Search for a movie</h1>

<form action="/results" method="GET" name="search">
    <input type="text" placeholder="search term">
    <input type="submit">
</form>

results.ejs code:

<h1>Results!!</h1>

<% data["Search"].forEach(function(movie){ %>
    <li><%= movie["Title"] %></li>
<% }) %>

I get undefined movie names:

I am getting an error while using express and axios

Sanket N Jain — Thu, 02 Jul 2020 08:21:48 +0000

I am using API to display movie search using express and axios when the user searches for a particular movie and I got some error after running the server.

Here is the express code:

var express = require("express");
const axios = require("axios");
var app = express();

app.set("view engine", "ejs");

app.get("/results", async function(req, res){
try{
const response = await axios.get('http://www.omdbapi.com/?s=hangover&apikey=thewdb');
res.render("results", {data:response.data});
}
catch(err){
console.log(err);
}
});

app.listen(3000, function(){
console.log("sever listening to port 3000");
});

And here is results.ejs file:

Here is the error:

Where can I practice frontend development?

Sanket N Jain — Thu, 25 Jun 2020 18:07:53 +0000

Is there any website to practice frontend development so that I can improve my HTML, CSS and JavaScript skills?

Is anyone a web developer digital nomad here?

Sanket N Jain — Wed, 24 Jun 2020 17:58:08 +0000

Tell me your story of:

How did you become a digital nomad?
What type of work do you do as a developer?
Do you get projects regularly?
How do you manage your expenses when there's no work?
Are you happy with this lifestyle?

How can I become a digital nomad like you?
Any suggestions that you wished have followed?