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Part-6 | NestJS(v9) | Angular(v14) | MongoDB | CRUD Example

The main objectives of this article are:
  • Create A Get By Id HTTP Get Endpoint In NestJS.
  • Create A HTTP Put Endpoint In NestJS.
  • Create Update Form In Angular App.

Create A Get By Id HTTP Get Endpoint In NestJS:

Let's create a get by id HTTP Get Endpoint. This endpoint is general to fetch the record that needs to be edited.

In our 'SuperHeroesService' let's implement logic to fetch a document by the 'id' value.
NestJS_App/src/super-heroes/super-heroes.service.ts:
import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { SuperHeroes, SuperHeroesDocument } from './schema/super-heroes.schema';
// existing code hidden for display purpose
@Injectable()
export class SuperHeroesService {
  constructor(
    @InjectModel(SuperHeroes.name)
    private superHeroModel: Model<SuperHeroesDocument>,
  ) {}

  async getByid(id: string) {
    return await this.superHeroModel.findById(id).exec();
  }
}
  • (Line: 13-15) Fetching the document by 'id' value from the MongoDB collection using the 'find(id)' method.
Now let's create the get by id HTTP get endpoint in our 'SuperHeroesController'.
NestJS_App/src/super-heroes/super-heroes.controller.ts:
import { Body, Controller, Get, Param, Post } from '@nestjs/common';
import { SuperHeroes } from './schema/super-heroes.schema';
import { SuperHeroesService } from './super-heroes.service';

@Controller('super-heroes')
export class SuperHeroesController {

    constructor(private superHeroService:SuperHeroesService){}

    @Get("/:id")
    async getById(@Param('id') id:string){
        return await this.superHeroService.getByid(id);
    }
}
  • (Line: 10) The '@Get(''/:id")' contains dynamic route value like 'id' in the URL.
  • (Line: 11) Here '@Param('id')' decorator loads from the 'nestjs/common' library. The '@Param('id')' helps to read the dynamic part of the URL like our 'id' value.

Create A HTTP Put Endpoint In NestJS:

In our 'SuperHeroesService' implement logic to update the document.
NestJS_App/src/super-heroes/super-heroes.service.ts:
import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { SuperHeroes, SuperHeroesDocument } from './schema/super-heroes.schema';
// existing code hidden for display purpose
@Injectable()
export class SuperHeroesService {
  constructor(
    @InjectModel(SuperHeroes.name)
    private superHeroModel: Model<SuperHeroesDocument>,
  ) {}

  async update(id: string, superHeroes: SuperHeroes) {
    return await this.superHeroModel.findByIdAndUpdate(id, superHeroes, {
      new: true,
    });
  }
}
  • (Line: 13) The 'update()' method had input params like 'id'(document id value), 'superHeroes'(document data to be updated).
  • The 'findByIdAndUpdate' async method updates the document data of specified 'id'. Here additional options 'new:true' defines the need to return the updated document, if we don't specify it explicitly by default it returns the document data before the update.
Let's create an HTTP PUT endpoint in our 'SuperHeroesController'.
NestJS_App/src/super-heroes/super-heroes.controller.ts:
import { Body, Controller, Get, Param, Post, Put } from '@nestjs/common';
import { SuperHeroes } from './schema/super-heroes.schema';
import { SuperHeroesService } from './super-heroes.service';

@Controller('super-heroes')
export class SuperHeroesController {
  constructor(private superHeroService: SuperHeroesService) {}

  @Put('/:id')
  async updateSuperHero(
    @Param('id') id: string,
    @Body() superHeroes: SuperHeroes,
  ) {
    return await this.superHeroService.update(id, superHeroes);
  }
}
  • (Line: 9) The '@Put' decorator makes our method can be consumed by an HTTP PUT request. Here we pass dynmic route expression like '/:id' means the 'id' value will be a dynamic value
  • (Line: 11) Using the '@Param' decorator read the 'id' value from the route.
  • (Line: 12) Using the '@Body' param read the form data that needs to be updated into our MongoDB document.

Create A New Angular Component 'EditSuperHeroesComponent':

Let's create a new angular component like 'EditSuperHeroesComponent'.
ng generate component super-heroes/edit-super-heroes --skip-tests


Configure the route of 'EditSuperHeroesComponent' in 'AppRoutingModule'.
Angular_App/src/app/app-routing.module.ts:
import { EditSuperHeroesComponent } from './super-heroes/edit-super-heroes/edit-super-heroes.component';
//existing code hidden for display purpose
const routes: Routes = [
  {
    path: 'edit-super-hero/:id',
    component: EditSuperHeroesComponent,
  }
];

Implement API Invoke Logic In Angular App 'SuperHeroesService':

Let's implement API invoke logic in our 'SuperHereosService'.
Angular_App/src/app/super-heroes/super-heroes.service.ts:
getById(id: string) {
 return this.http.get<SuperHeroes>(
  `http://localhost:3000/super-heroes/${id}`
 );
}

update(id: string, superHero: CreateOrUpdateSuperHero) {
 return this.http.put(`http://localhost:3000/super-heroes/${id}`, superHero);
}
  • (Line: 1-5) The HTTP Get API to fetch item need to be updated. Here to frame dynamic value to API call we have to use "`${}`".
  • (Line: 7-9) The HTTP PUT API to update the document data.

Update Form:

Let's implement the update form logic in 'EditSuperHeroesComponent'.
Angular_App/src/super-heroes/edit-super-heroes/edit-super-heroes.component.ts:
import { Component, OnInit } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';
import { CreateOrUpdateSuperHero } from '../create-or-update-super-hero';
import { SuperHeroesService } from '../super-heroes.service';

@Component({
  selector: 'app-edit-super-heroes',
  templateUrl: './edit-super-heroes.component.html',
  styleUrls: ['./edit-super-heroes.component.css'],
})
export class EditSuperHeroesComponent implements OnInit {
  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private superHeroService: SuperHeroesService
  ) {}

  itemId: string = '';
  superHeroes: CreateOrUpdateSuperHero = {
    name: '',
    franchise: '',
    imageUrl: '',
    powers: '',
  };

  ngOnInit(): void {
    this.route.paramMap.subscribe((param) => {
      this.itemId = param.get('id') ?? '';
      this.getById();
    });
  }

  getById() {
    this.superHeroService.getById(this.itemId).subscribe((data) => {
      this.superHeroes.franchise = data.franchise;
      this.superHeroes.imageUrl = data.imageUrl;
      this.superHeroes.powers = data.powers;
      this.superHeroes.name = data.name;
    });
  }

  update() {
    this.superHeroService
      .update(this.itemId, this.superHeroes)
      .subscribe(() => {
        this.router.navigate(['/']);
      });
  }
}
  • (Line: 13&14) Injected the 'ActivatedRoute', and 'Router' services which load from the '@angular/router'.
  • (Line: 15) Injected the 'SuperHeroesService'.
  • (Line: 18) The 'itemId' variable stores the 'id' value of the document we want to update.
  • (Line: 19-24) The 'superHeroes' variable of type 'CreateOrUpdateSuperHeroes' used for update form modal binding.
  • (Line: 27-29) Using the 'ActivatedRoute' service read the 'id' value from the angular router URL.
  • (Line: 32-39) Invoking the get by id API call and response assigned to the 'superHeroes' variable object so that the edit form gets populated with the data.
  • (Line: 41-47) Invokes the update API call and on success navigates back to the home page.
Angular_App/src/app/super-heroes/edit-super-heroes/edit-super-heroes.component.html:
<div class="container mt-2">
    <legend>Update Item</legend>
    <form>
      <div class="mb-3">
        <label for="txtName" class="form-label">Name</label>
        <input
          type="text"
          name="name"
          [(ngModel)]="superHeroes.name"
          class="form-control"
          id="txtName"
        />
      </div>
      <div class="mb-3">
        <label for="txtFranchise" class="form-label">Franchise</label>
        <input
          type="text"
          name="txtFranchise"
          [(ngModel)]="superHeroes.franchise"
          class="form-control"
          id="txtFranchise"
        />
      </div>
      <div class="mb-3">
        <label for="txtImageUrl" class="form-label">ImageUrl</label>
        <input
          type="text"
          name="txtImageUrl"
          [(ngModel)]="superHeroes.imageUrl"
          class="form-control"
          id="txtImageUrl"
        />
      </div>
      <div class="mb-3">
        <label for="txtPowers" class="form-label">Powers</label>
        <textarea
          class="form-control"
          name="powers"
          id="txtPowers"
          [(ngModel)]="superHeroes.powers"
          rows="3"
        ></textarea>
      </div>
      <button type="button" (click)="update()" class="btn btn-primary">
        Update
      </button>
    </form>
  </div>
Now add the 'Edit' button in 'all-super-heroes.component.html'.
Angular_App/src/app/all-super-heroes/all-super-heroes.component.html:
  The lang-* class specifies the language file extensions.
<div class="container mt-2">
  <div class="row mt-2">
    <div class="col col-md-4 offset-md-4">
      <a class="btn btn-primary" routerLink="/add-super-hero">Create</a>
    </div>
  </div>
  <div class="row row-cols-1 row-cols-md-3 g-2">
    <div class="col" *ngFor="let item of superHeroes">
      <div class="card">
        <img src="{{ item.imageUrl }}" class="card-img-top" alt="..." />
        <div class="card-body">
          <h5 class="card-title">{{ item.name }}</h5>
          <p class="card-text"><b>Franchise:</b> {{ item.franchise }}</p>
          <p class="card-text"><b>Powers:</b> {{ item.powers }}</p>
        </div>
        <div class="card-body">
        <a class="btn btn-dark" [routerLink]="['edit-super-hero',item._id]"> Edit</a>
        </div>
      </div>
      
    </div>
  </div>
</div>
  • (Line: 19) Configure the 'Edit' button.
(Step 1)

(Step 2)

(Step 3)

In the next article, we will implement the delete operation.

Video session:

Wrapping Up:

Hopefully, I think this article delivered some useful information on NestJS (v9) and Angular(v4). using I love to have your feedback, suggestions, and better techniques in the comment section below.

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