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QUESTION
const express = require('express');
const mongoose = require ("mongoose");
const app = express();
const Student = require('../models/students');
require('dotenv').config();
const PORT = process.env.PORT || 3000;
const cors = require('cors');
app.use(express.json());
app.use(express.urlencoded({extended:true}));
app.use(cors());
app.use(express.static('./dist/mean-stack-application'));
mongoose.connect(process.env.MONGO_URL, {
useCreateIndex: true,
useNewUrlParser: true,
useUnifiedTopology: true,
useFindAndModify: false
}).then(() => {
console.log("Connection is Successful");
}).catch((e) => {
console.log("No Connection");
});
app.get("/studentData", async( req,res ) => {
try{
const getStudentsData = await Student.find();
console.log(getStudentsData);
res.send(getStudentsData);
}catch(e){
res.send(e);
}
});
app.listen(PORT, () => {
console.log(`Connection is setup at ${PORT}`);
});
ANSWER
Answered 2021-Feb-17 at 17:02There's nothing wrong here. A 304 is not an error. It is how a web server set up for efficiency works. When a cooperating client asks for the same resource they've previously asked for in a "conditional GET request" and that resource has not changed since they previously cached it, then the server sends them a 304. The client can then use their cached version.
For further info see this description on MDN.
The HTTP 304 Not Modified client redirection response code indicates that there is no need to retransmit the requested resources. It is an implicit redirection to a cached resource. This happens when the request method is safe, like a GET or a HEAD request, or when the request is conditional and uses a If-None-Match or a If-Modified-Since header.
You may be seeing it on Heroku because that's where you're configured for a production deployment so these types of optimizations are enabled.
QUESTION
When I am calling the following function to get data from MongoDB, I am getting an undefined. I suspect it is because I need to convert the function to an async/await function. However, I am not sure how to do this without breaking the functions and their chains as they stand? Is there a simple way to convert this to async/await?
...ANSWER
Answered 2020-Oct-10 at 18:13It turned out the issue was the same as this. When one item is returned by the database, it is an object and not an array. The object has an undefined length
Typescript Convert Object to Array - because *ngFor does not supports iteration of object
QUESTION
I saw a similar question posted Here, but they are using MEAN-Stack.
I am currently just using a 'setTimeout' function to wait a few seconds before requesting new data from the server using a fetch api to give it time to update but this doesnt feel like the right way to do it. Is there a simple way for the front-end to update only after the database is updated in Express? I am new to Node please forgive me.
app.js:
...ANSWER
Answered 2020-Aug-29 at 22:09You should use async and await function
Example: After async/await
QUESTION
I followed this tutorial https://www.positronx.io/angular-8-mean-stack-tutorial-build-crud-angular-material/ to create a MEAN app
My express API works via curl and data successfully populates the mongo database. My angular front end also works in a live browser using nginx as the server. I am also able to proxy_pass to use express to serve the angular STATIC files directly.
When I try to POST data into a form from the browser I get an error saying ERR_CONNECTION_REFUSED. I have been stuck on this for a few days and not sure how I can resolve this. I suspect the issue is with my nginx file or /sites-available/default file, given that curl works in the command line.
My key files are:
/etc/nginx/sites-available/default:
...ANSWER
Answered 2020-Jul-30 at 11:08This has now been solved. The issue was with the api.service file in angular
QUESTION
How can I use find select distinct in angularJS then counting it, I'm new to mean-stack and I don't know how to use distinct method.
Here is my table structure with sample data:
...ANSWER
Answered 2018-Dec-21 at 09:27You should try distinct()
QUESTION
I have paid a membership and downloaded this project. After npm install and node app.js, it returns the following error:
Does anyone know what's wrong?
...ANSWER
Answered 2020-Feb-24 at 19:09Update 2020 Feb 24:
It would be wise to stay tuned with it. Here is the link for latest library instruction:
https://docs.mongodb.com/manual/administration/install-community/
You haven't started your monogo database. first install mongo install mongo as per your OS https://docs.mongodb.com/v3.0/tutorial/
then follow instructions mentioned on this site: https://docs.mongodb.com/v3.0/tutorial/getting-started-with-the-mongo-shell/
- cd .
- mongod --dbpath "any directory path to start your database "
and then start your node server. It will work fine.
Hope this helps!!
QUESTION
I've been following this tutorial (https://www.sitepoint.com/user-authentication-mean-stack/) and referencing the github linked (https://github.com/sitepoint-editors/MEAN-stack-authentication) to learn MEAN stack. I am using express on port 3000 and angular on port 4200 so I had to make a few changes to my client/src/app/authentication.service.ts file so that it tries to post at port 3000.
...ANSWER
Answered 2020-Jan-30 at 17:12After seeing that there wasn't any information loading from the backend of the app, I thought there might have been something up with my app.js file.
Placed my packages in this order and the request went through.
QUESTION
I'm following a simple guide and amending it lightly for my needs - But I have finally hit a snag regarding mapping and subscribing
https://www.sitepoint.com/mean-stack-angular-2-angular-cli/ - This is the guide and everything is working until I go to build the app after building out the List Service.
I've made a few amendments due to Angular 5 such as replacing with HttpClient, but nothing out of the ordinary.
My present issue falls on these 2 functions:
...ANSWER
Answered 2018-Feb-06 at 18:58With HttpClient you can directly do it as follows,
QUESTION
I guess I will start at the start of my application.
I am making a full mean-stack application and I want it to run in docker. To use docker I am using a virtualbox with Ubuntu. When I run my docker-compose, everything is working on localhost:4200. Now I want to open my application on my host machine (Windows 7). When I go to my application via (ip addres should be kept secret, right?) xxx.xxx.xx.xxx:4200/login the page looks fine, but I get these errors:
I am using Angular cli 1.4.1 with node 8.4.0
Why am I getting these errors and how do I fix them?
My docker-compose
...ANSWER
Answered 2017-Oct-27 at 10:03Your server which is listening on port 4200 is listening on your xxx.xxx.xxx.xxx interface (not necessary to hide lan IP, but nevermind...).
Your angular application is running on your host system. the localhost is the localhost of your host system, not the guest. so you have two solutions:
- changing your urls inside the angular application to point to
xxx.xxx.xxx.xxx:4200instead oflocalhost:4200. - Forwarding your 4200 port from your host to your guest system using virtual box :
- shutdown guest.
- select guest and click on
settings - go to the network tab.
- click on "advanced"
- then select "ports redirections" and bind your host 127.0.0.1:4200 to your guest's 4200 port
QUESTION
I'm learning MEAN stack. I want to perform CRUD operations and I'm using mongoose. I am following this question on stackoverflow. I want to delete a document by specific value. In my case it is an article with a unique articleid which should get deleted. Unknowingly I'm doing some terrible mistake with params. Please correct me.
Sample document in mongodb.
ANSWER
Answered 2019-Sep-22 at 06:06Ok. I did more and more research and figured out the problem. Here are the changes.
api.js
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