How to make a PUT request to an Express application - mysql

Question

I'm trying to create a web application using Angular and Node for study, but my PUT request isn't working even though my GET requests work. It seems like Node is ignoring the requests and I can't find why. In my app I try to edit the name of a user when clicking a button and I can see that the request works until it gets to the http client in users-service.service.ts.
users.component.html
<router-outlet></router-outlet>
<h3>Usuários</h3>
<table>
<tr><td>Nome</td></tr>
<tr *ngFor="let user of users"><td>{{user.first_name}}</td><td><button (click)="showUserInfo($event, user)">Editar</button></td></tr>
</table>
<br/><br/>
<div>
<label>First Name: </label><input type="text" value="{{user.first_name}}" (input)="user.first_name = $event.target.value">
<label>Last Name: </label><input type="text" value="{{user.last_name}}" (input)="user.last_name= $event.target.value">
<button (click)="updateUser()">Salvar</button>
</div>
<br/><br/>
<button (click)="loadAllUsers()">Reload</button>
users.component.ts
import { HttpClient, HttpClientModule } from '#angular/common/http';
import { UsersService, User } from './../users-service.service';
import { Component, OnInit } from '#angular/core';
#Component({
selector: 'app-users',
providers: [UsersService, HttpClient, HttpClientModule],
templateUrl: './users.component.html',
styleUrls: ['./users.component.sass']
})
export class UsersComponent implements OnInit {
private users: User[];
private user: User = {first_name: '', last_name: '', id: null};
constructor(private service: UsersService) {
this.loadAllUsers();
}
ngOnInit() {}
showUserInfo(event, u : User) {
this.user = u;
}
loadAllUsers() {
this.service.getAllUsers().subscribe(valor => { this.users = valor as User[] });
}
updateUser() {
console.log(this.user);
this.service.updateUser(this.user);
}
}
users-service.service.ts
import { HttpClient, HttpClientModule, HttpHeaders } from '#angular/common/http';
import { Injectable } from '#angular/core';
import { Observable } from 'rxjs';
export interface User{
first_name: string,
last_name: string,
id: number
}
#Injectable()
export class UsersService{
constructor(private http: HttpClient) { }
getAllUsers(): Observable<User[]>{
return this.http.get<User[]>("http://localhost:4600/api/users");
}
updateUser(user: User): Observable<void>{
console.log('Updating: ' + user);
console.log("http://localhost:4600/api/users/" + user.id);
return this.http.put<void>("http://localhost:4600/api/users/" + user.id, user);
}
}
server.js
const express = require('express');
app = new express();
const morgan = require('morgan');
const cors = require('cors');
const mysql = require('mysql');
const bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(morgan('dev'));
app.use('*', cors());
app.listen(4600, () => {
console.log("Server listening on port 4600...");
});
//All users
app.get("/api/users", (req, res) => {
let connection = getConnection();
connection.query('SELECT * FROM USERS', (err, result) => {
if(err){
throw err;
}
console.log(result);
res.json(result);
});
});
//Specific user
app.get('/api/users/:id', (req, res) => {
getConnection().query('SELECT * FROM USERS WHERE ID = ?', req.params.id, (err, result) => {
if(err){
console.log(err.message);
throw err;
}
res.json(result);
});
});
//Update user
app.put("/api/users/:id", (req, res) => {
console.log('PUT request received...');
getConnection().query("UPDATE USERS SET FIRST_NAME = ?, LAST_NAME = ? WHERE ID = ?", [req.body.first_name, req.body.last_name, req.body.id], (err, result) => {
if(err){
console.log(err.message);
throw err;
}
res.send(201, req.body);
});
});
//Delete user
app.delete('/api/users/:id', (req, res) => {
});
function getConnection(){
return mysql.createConnection({
host: 'localhost',
user: '',
password: '',
database: 'test'
});
}
EDIT 1
Based on #tadman comment I searched for the Network tools available in my browser and I found out, as expected, that the POST request were being ignored. By subscribing to the http client, the POST requests started to be noticed as they should. The answer by #KeaganFouche in the question bellow helped me:
Angular 4.0 http put request
New update method in the Angular service:
updateUser(user: User): void{
console.log('Updating: ' + user);
console.log("http://localhost:4600/api/users/" + user.id);
this.http.put<void>("http://localhost:4600/api/users/" + user.id, user).subscribe((response) => {console.log(response)});
}

Answer 1

Based on #tadman comment I searched for the Network tools available in my browser and I found out, as expected, that the POST request were being ignored. By subscribing to the http client, the POST requests started to be noticed as they should. The answer by #KeaganFouche in the question bellow helped me: Angular 4.0 http put request
New update method in the Angular service:
updateUser(user: User): void{
console.log('Updating: ' + user);
console.log("http://localhost:4600/api/users/" + user.id);
this.http.put<void>("http://localhost:4600/api/users/" + user.id, user).subscribe((response) => {console.log(response)});
}