Mongoose is a MongoDB object modeling tool that provides a schema-based solution to model data. In the tutorial, we will show how to build get/post/put/delete requests from Angular 6 Client to MongoDB with NodeJs/Express RestAPIs using Mongoose ODM.
Related posts:
– Node.js/Express RestAPIs – Angular 6 HttpClient – Get/Post/Put/Delete requests + Bootstrap 4
– Crud RestAPIs with NodeJS/Express, MongoDB using Mongoose
Technologies
- Angular 6
- RxJS 6
- Bootstrap 4
- Visual Studio Code – version 1.24.0
- Nodejs – v8.11.3
- Mongoose
- MongoDB
Demo
Overview
Goal
We create 2 projects:
– Angular Client Project:
– Node.js RestAPIs project:
UserCase
Start Node.js server -> Logs:
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App listening at http://:::8080 Successfully connected to MongoDB. Customer collection removed >>> Done - Initial Data! |
-> MongoDB’s documents:
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> db.customers.find(); { "_id" : ObjectId("5b432fb558cbf6427cc7d527"), "firstname" : "Joe", "lastname" : "Thomas", "age" : 36, "__v" : 0 } { "_id" : ObjectId("5b432fb558cbf6427cc7d528"), "firstname" : "Peter", "lastname" : "Smith", "age" : 18, "__v" : 0 } { "_id" : ObjectId("5b432fb558cbf6427cc7d529"), "firstname" : "Lauren", "lastname" : "Taylor", "age" : 31, "__v" : 0 } { "_id" : ObjectId("5b432fb558cbf6427cc7d52a"), "firstname" : "Mary", "lastname" : "Taylor", "age" : 24, "__v" : 0 } { "_id" : ObjectId("5b432fb558cbf6427cc7d52b"), "firstname" : "David", "lastname" : "Moore", "age" : 25, "__v" : 0 } { "_id" : ObjectId("5b432fb558cbf6427cc7d52d"), "firstname" : "Michael", "lastname" : "Brown", "age" : 45, "__v" : 0 } { "_id" : ObjectId("5b432fb558cbf6427cc7d52c"), "firstname" : "Holly", "lastname" : "Davies", "age" : 27, "__v" : 0 } |
– Angular client retrieve all customers from Node.js RestAPIs:
– Angular client update a customer -> Change the firstname of first customer: ‘Joe’ to ‘Robert’.
-> result:
– Delete ‘Peter’ customer:
– Add a new customer:
-> result:
– Check final customer’s list:
-> MongoDB’s documents:
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> db.customers.find(); { "_id" : ObjectId("5b434e5ce30d33364834a8e9"), "firstname" : "Robert", "lastname" : "Thomas", "age" : 36, "__v" : 0 } { "_id" : ObjectId("5b434e5ce30d33364834a8eb"), "firstname" : "Lauren", "lastname" : "Taylor", "age" : 31, "__v" : 0 } { "_id" : ObjectId("5b434e5ce30d33364834a8ec"), "firstname" : "Mary", "lastname" : "Taylor", "age" : 24, "__v" : 0 } { "_id" : ObjectId("5b434e5ce30d33364834a8ed"), "firstname" : "David", "lastname" : "Moore", "age" : 25, "__v" : 0 } { "_id" : ObjectId("5b434e5ce30d33364834a8ef"), "firstname" : "Michael", "lastname" : "Brown", "age" : 45, "__v" : 0 } { "_id" : ObjectId("5b434e5ce30d33364834a8ee"), "firstname" : "Holly", "lastname" : "Davies", "age" : 27, "__v" : 0 } { "_id" : ObjectId("5b435016e30d33364834a8f0"), "firstname" : "Maria", "lastname" : "Garcia", "age" : 39, "__v" : 0 } > |
Node.js/Express RestAPIs
Node.js exposes 5 RestAPIs as below:
router.post(‘/api/customers’, customers.create);router.get(‘/api/customers’, customers.findAll);router.get(‘/api/customers/:id’, customers.findOne);router.put(‘/api/customers’, customers.update);router.delete(‘/api/customers/:id’, customers.delete);
– Configure cross-origin for Angular-Client which running at port: 4200.
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const cors = require('cors') const corsOptions = { origin: 'http://localhost:4200', optionsSuccessStatus: 200 } app.use(cors(corsOptions)) |
Angular 6 HttpClient
Use Angular HttpClient APIs to do Get/Post/Put/Delete requests to Node.js RestAPIs:
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getCustomers (): Observable<Customer[]> { return this.http.get<Customer[]>(this.customersUrl) } getCustomer(id: string): Observable<Customer> { const url = `${this.customersUrl}/${id}`; return this.http.get<Customer>(url); } addCustomer (customer: Customer): Observable<Customer> { return this.http.post<Customer>(this.customersUrl, customer, httpOptions); } deleteCustomer (customer: Customer | string): Observable<Customer> { const id = typeof customer === 'string' ? customer : customer._id; const url = `${this.customersUrl}/${id}`; return this.http.delete<Customer>(url, httpOptions); } updateCustomer (customer: Customer): Observable<any> { return this.http.put(this.customersUrl, customer, httpOptions); } |
Practice
Express Mongoose RestAPIs
Setting up NodeJs/Express project
Following the guide to create a NodeJS/Express project.
Install Express, Mongoose, Body-Parser, and Cors:
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$npm install express mongoose body-parse cors --save |
– Body-Parser -> Parse incoming request bodies in a middleware before your handlers, available under the req.body property.
– Express is one of the most popular web frameworks for NodeJs which is built on top of Node.js http module, and adds support for routing, middleware, view system etc.
– Cors is a mechanism that uses HTTP headers to tell a browser to let a web application running at one origin (domain) have permission to access selected resources from a server at a different origin.
– Sequelize is a promise-based ORM for Node.js v4 and up. It supports the dialects PostgreSQL, MySQL …
-> package.json file:
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{ "name": "nodejs-restapi-mongodb", "version": "1.0.0", "description": "NodeJs-RestApis-MongoDB", "main": "server.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "keywords": [ "NodeJs-RestAPIs-MongoDB" ], "author": "JSA", "license": "ISC", "dependencies": { "body-parser": "^1.18.2", "cors": "^2.8.4", "express": "^4.16.3", "mongoose": "^5.0.13", "npm": "^5.8.0" } } |
Mongoose Schema
– Create file ‘./app/models/customer.model.js’ ->
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const mongoose = require('mongoose'); const CustomerSchema = mongoose.Schema({ firstname: String, lastname: String, age: { type: Number, min: 18, max: 65, required: true } }); |
Configure MongoDB’s URL
In the root folder, create a file ‘app/config/mongodb.config.js’ as below content ->
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module.exports = { url: 'mongodb://localhost:27017/nodejs-demo' } |
Implement CRUD APIs
Routes ->
In the root folder, create a file ‘app/routes/customer.routes.js’ as below content ->
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module.exports = function(app) { const customers = require('../controllers/customer.controller.js'); // Create a new Customer app.post('/api/customers', customers.create); // Retrieve all Customer app.get('/api/customers', customers.findAll); // Retrieve a single Customer by Id app.get('/api/customers/:customerId', customers.findOne); // Update a Customer with Id app.put('/api/customers', customers.update); // Delete a Customer with Id app.delete('/api/customers/:customerId', customers.delete); } |
Controllers
In root folder ‘nodejs-restapi’, create a controller folder ‘/app/controllers’. Then create a file ‘/app/controllers/customer.controller.js’ that contains methods for executing above URL requests ->
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const Customer = require('../models/customer.model.js'); // POST a Customer exports.create = (req, res) => { // Create a Customer const customer = new Customer(req.body); // Save a Customer in the MongoDB customer.save() .then(data => { res.json(data); }).catch(err => { res.status(500).json({ msg: err.message }); }); }; // FETCH all Customers exports.findAll = (req, res) => { Customer.find() .then(customers => { res.json(customers); }).catch(err => { res.status(500).send({ msg: err.message }); }); }; // FIND a Customer exports.findOne = (req, res) => { Customer.findById(req.params.customerId) .then(customer => { if(!customer) { return res.status(404).json({ msg: "Customer not found with id " + req.params.customerId }); } res.json(customer); }).catch(err => { if(err.kind === 'ObjectId') { return res.status(404).json({ msg: "Customer not found with id " + req.params.customerId }); } return res.status(500).json({ msg: "Error retrieving Customer with id " + req.params.customerId }); }); }; // UPDATE a Customer exports.update = (req, res) => { // Find customer and update it Customer.findByIdAndUpdate(req.body._id, req.body, {new: true}) .then(customer => { if(!customer) { return res.status(404).json({ msg: "Customer not found with id " + req.params.customerId }); } res.json(customer); }).catch(err => { if(err.kind === 'ObjectId') { return res.status(404).json({ msg: "Customer not found with id " + req.params.customerId }); } return res.status(500).json({ msg: "Error updating customer with id " + req.params.customerId }); }); }; // DELETE a Customer exports.delete = (req, res) => { Customer.findByIdAndRemove(req.params.customerId) .then(customer => { if(!customer) { return res.status(404).json({ msg: "Customer not found with id " + req.params.customerId }); } res.json({msg: "Customer deleted successfully!"}); }).catch(err => { if(err.kind === 'ObjectId' || err.name === 'NotFound') { return res.status(404).json({ msg: "Customer not found with id " + req.params.customerId }); } return res.status(500).json({ msg: "Could not delete customer with id " + req.params.customerId }); }); }; |
Server.js
‘server.js’ ->
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const express = require('express'); const app = express(); const bodyParser = require('body-parser'); app.use(bodyParser.json()) // Configuring the database const dbConfig = require('./app/config/mongodb.config.js'); const mongoose = require('mongoose'); const Customer = require('./app/models/customer.model.js'); mongoose.Promise = global.Promise; // Connecting to the database mongoose.connect(dbConfig.url) .then(() => { console.log("Successfully connected to MongoDB."); Customer.remove({}, function(err) { if(err){ console.log(err); process.exit(); } console.log('Customer collection removed'); // -> initial new data initial(); }); }).catch(err => { console.log('Could not connect to MongoDB.'); process.exit(); }); const cors = require('cors') const corsOptions = { origin: 'http://localhost:4200', optionsSuccessStatus: 200 } app.use(cors(corsOptions)) require('./app/routes/customer.routes.js')(app); // Create a Server const server = app.listen(8080, function () { let host = server.address().address let port = server.address().port console.log("App listening at http://%s:%s", host, port) }) function initial(){ let customers = [ { firstname: "Joe", lastname: "Thomas", age: 36 }, { firstname: "Peter", lastname: "Smith", age: 18 }, { firstname: "Lauren", lastname: "Taylor", age: 31 }, { firstname: "Mary", lastname: "Taylor", age: 24 }, { firstname: "David", lastname: "Moore", age: 25 }, { firstname: "Holly", lastname: "Davies", age: 27 }, { firstname: "Michael", lastname: "Brown", age: 45 } ] // Init data -> save to MongoDB for (let i = 0; i < customers.length; i++) { const customer = new Customer(customers[i]); customer.save(); } console.log(">>> Done - Initial Data!"); } |
Angular 6 Client
Data Model
customer.ts ->
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export class Customer { _id: string; firstname: string; lastname: string; age: number; } |
Configure AppModule
In the developed application, we use:
- Angular
Forms-> for building form HttpClient-> for httpGet/Post/Put/DeleterequestsAppRouting-> for app routing
-> Modify AppModule app.module.ts:
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import { BrowserModule } from '@angular/platform-browser'; import { NgModule } from '@angular/core'; import { FormsModule } from '@angular/forms'; import { HttpClientModule } from '@angular/common/http'; import { AppRoutingModule } from './app-routing/app-routing.module'; import { AppComponent } from './app.component'; import { CustomerComponent } from './customer/customer.component'; import { CustomerDetailsComponent } from './customer-details/customer-details.component'; import { AddCustomerComponent } from './add-customer/add-customer.component'; @NgModule({ declarations: [ AppComponent, CustomerComponent, CustomerDetailsComponent, AddCustomerComponent ], imports: [ BrowserModule, FormsModule, AppRoutingModule, HttpClientModule ], providers: [], bootstrap: [AppComponent] }) export class AppModule { } |
HttpClient DataService
Implement CustomerService customer.service.ts with HttpClient for Get/Post/Put/Delete:
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import { Injectable } from '@angular/core'; import { HttpClient, HttpHeaders } from '@angular/common/http'; import { Observable } from 'rxjs'; import { Customer } from './customer'; const httpOptions = { headers: new HttpHeaders({ 'Content-Type': 'application/json' }) }; @Injectable({ providedIn: 'root' }) export class CustomerService { private customersUrl = 'http://localhost:8080/api/customers'; // URL to web api constructor( private http: HttpClient ) { } getCustomers (): Observable<Customer[]> { return this.http.get<Customer[]>(this.customersUrl) } getCustomer(id: string): Observable<Customer> { const url = `${this.customersUrl}/${id}`; return this.http.get<Customer>(url); } addCustomer (customer: Customer): Observable<Customer> { return this.http.post<Customer>(this.customersUrl, customer, httpOptions); } deleteCustomer (customer: Customer | string): Observable<Customer> { const id = typeof customer === 'string' ? customer : customer._id; const url = `${this.customersUrl}/${id}`; return this.http.delete<Customer>(url, httpOptions); } updateCustomer (customer: Customer): Observable<any> { return this.http.put(this.customersUrl, customer, httpOptions); } } |
Angular Router
Implement App-Routing module app-routing.module.ts ->
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import { NgModule } from '@angular/core'; import { RouterModule, Routes } from '@angular/router'; import { CustomerComponent } from '../customer/customer.component'; import { AddCustomerComponent } from '../add-customer/add-customer.component'; import { CustomerDetailsComponent } from '../customer-details/customer-details.component'; const routes: Routes = [ { path: 'customers', component: CustomerComponent }, { path: 'customer/add', component: AddCustomerComponent }, { path: 'customers/:id', component: CustomerDetailsComponent }, { path: '', redirectTo: 'customers', pathMatch: 'full' }, ]; @NgModule({ imports: [ RouterModule.forRoot(routes) ], exports: [ RouterModule ] }) export class AppRoutingModule {} |
Router Outlet & Router Links
-> Questions:
- How to show Componenets with Angular Routers? -> Solution: using
Router Outlet - How to handle the routing that comes from user’s actions? (like clicks on anchor tag) -> Solution: using
Router Link
-> We can achieve above functions by using Angular’s router-outlet and routerLink.
Modify the template file app.component.html of AppComponenet component as below:
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<div class="container"> <div class="row"> <div class="col-sm-4"> <h1>Angular HttpClient</h1> <ul class="nav justify-content-center"> <li class="nav-item"> <a routerLink="customers" class="btn btn-light btn-sm" role="button" routerLinkActive="active">Retrieve</a> </li> <li class="nav-item"> <a routerLink="customer/add" class="btn btn-light btn-sm" role="button" routerLinkActive="active">Create</a> </li> </ul> <hr> <router-outlet></router-outlet> </div> </div> </div> |
Customer Component
Customer Component ->
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– Implement CustomerComponent class customer.component.ts :
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import { Component, OnInit } from '@angular/core'; import { Customer } from '../customer'; import { CustomerService } from '../customer.service'; @Component({ selector: 'app-customer', templateUrl: './customer.component.html', styleUrls: ['./customer.component.css'] }) export class CustomerComponent implements OnInit { customers: Customer[]; constructor(private customerService: CustomerService) {} ngOnInit(): void { this.getCustomers(); } getCustomers() { return this.customerService.getCustomers() .subscribe( customers => { console.log(customers); this.customers = customers } ); } } |
– Implement the template customer.component.html :
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<h5>All Customers</h5> <div *ngFor="let cust of customers; let rowIndex=index"> <a [routerLink]="['/customers', cust._id]" style="color:black"><span class="badge badge-dark">{{rowIndex + 1}}</span> -> {{cust.firstname}}</a> </div> |
Customer Detail Component
Customer Detail ->
-> results:
– Implement CustomerDetails class customer-details.component.ts:
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import { Component, OnInit } from '@angular/core'; import { Customer } from '../customer'; import { CustomerService } from '../customer.service'; import { ActivatedRoute, Params } from '@angular/router'; import { Location } from '@angular/common'; @Component({ selector: 'app-customer-details', templateUrl: './customer-details.component.html', styleUrls: ['./customer-details.component.css'] }) export class CustomerDetailsComponent implements OnInit { customer = new Customer() ; submitted = false; message: string; constructor( private customerService: CustomerService, private route: ActivatedRoute, private location: Location ) {} ngOnInit(): void { const id = this.route.snapshot.paramMap.get('id'); this.customerService.getCustomer(id) .subscribe(customer => this.customer = customer); } update(): void { this.submitted = true; this.customerService.updateCustomer(this.customer) .subscribe(result => this.message = "Customer Updated Successfully!"); } delete(): void { this.submitted = true; this.customerService.deleteCustomer(this.customer._id) .subscribe(result => this.message = "Customer Deleted Successfully!"); } goBack(): void { this.location.back(); } } |
– Implement CustomerDetailsComponent template customer-details.component.html :
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<h5><span class="badge badge-light ">{{customer._id}}</span> -> {{customer.firstname}}</h5> <div [hidden]="submitted"> <form #detailCustomerForm="ngForm"> <div class="form-group"> <label for="firstname">First Name</label> <input type="text" class="form-control" id="firstname" required [(ngModel)]="customer.firstname" name="firstname" #firstname="ngModel"> <div [hidden]="firstname.valid || firstname.pristine" class="alert alert-danger"> First Name is required </div> </div> <div class="form-group"> <label for="lastname">Last Name</label> <input type="text" class="form-control" id="lastname" required [(ngModel)]="customer.lastname" name="lastname" #lastname="ngModel"> <div [hidden]="lastname.valid || lastname.pristine" class="alert alert-danger"> Last Name is required </div> </div> <div class="form-group"> <label for="age">Age</label> <input type="number" class="form-control" id="age" required [(ngModel)]="customer.age" name="age" #age="ngModel"> <div [hidden]="age.valid || age.pristine" class="alert alert-danger"> Age is required </div> </div> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-dark" (click)="goBack()">Back</button> <button type="button" class="btn btn-dark" (click)="update()" [disabled]="!detailCustomerForm.form.valid">Update</button> <button type="button" class="btn btn-dark" (click)="delete()">Delete</button> </div> </form> </div> <div [hidden]="!submitted"> <p>{{message}}</p> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-dark" (click)="goBack()">Back</button> </div> </div> |
We can change the value of ng-valid & ng-invalid for more visual feedback,
-> Create ./assets/forms.css file:
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.ng-valid[required], .ng-valid.required { border-left: 5px solid rgba(32, 77, 32, 0.623); } .ng-invalid:not(form) { border-left: 5px solid rgb(148, 27, 27); } |
Add ./assets/forms.css file to index.html :
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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>Angular6Httpclient</title> <base href="/"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="icon" type="image/x-icon" href="favicon.ico"> <link rel="stylesheet" href="assets/forms.css"> </head> <body> <app-root></app-root> </body> </html> |
Add-Customer Component
AddCustomer Component ->
-> result:
– Implement AddCustomerComponent class add-customer.component.ts:
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import { Component, OnInit } from '@angular/core'; import { Customer } from '../customer'; import { CustomerService } from '../customer.service'; import { Location } from '@angular/common'; @Component({ selector: 'app-add-customer', templateUrl: './add-customer.component.html', styleUrls: ['./add-customer.component.css'] }) export class AddCustomerComponent{ customer = new Customer(); submitted = false; constructor( private customerService: CustomerService, private location: Location ) { } newCustomer(): void { this.submitted = false; this.customer = new Customer(); } addCustomer() { this.submitted = true; this.save(); } goBack(): void { this.location.back(); } private save(): void { console.log(this.customer); this.customerService.addCustomer(this.customer) .subscribe(); } } |
– Implement the template add-customer.component.html:
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<h3>Add Customer</h3> <div [hidden]="submitted"> <form #addCustomerForm="ngForm"> <div class="form-group"> <label for="firstname">First Name</label> <input type="text" class="form-control" id="firstname" placeholder="Give Customer's FirstName" required [(ngModel)]="customer.firstname" name="firstname" #firstname="ngModel"> <div [hidden]="firstname.valid || firstname.pristine" class="alert alert-danger"> First Name is required </div> </div> <div class="form-group"> <label for="lastname">Last Name</label> <input type="text" class="form-control" id="lastname" placeholder="Give Customer's LastName" required [(ngModel)]="customer.lastname" name="lastname" #lastname="ngModel"> <div [hidden]="lastname.valid || lastname.pristine" class="alert alert-danger"> Last Name is required </div> </div> <div class="form-group"> <label for="age">Age</label> <input type="number" class="form-control" id="age" placeholder="Give Customer's Age" required [(ngModel)]="customer.age" name="age" #age="ngModel"> <div [hidden]="age.valid || age.pristine" class="alert alert-danger"> Age is required </div> </div> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-dark" (click)="goBack()">Back</button> <button type="button" class="btn btn-dark" (click)="addCustomer()" [disabled]="!addCustomerForm.form.valid">Add</button> </div> </form> </div> <div [hidden]="!submitted"> <p>Submitted Successfully! -> <span class="badge badge-light">{{customer.firstname}} {{customer.lastname}}</span></p> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-dark" (click)="goBack()">Back</button> <button type="button" class="btn btn-dark" (click)="newCustomer(); addCustomerForm.reset()">Continue</button> </div> </div> |
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