◾️ this memo is from nomadcoders lecture
- install nestjs
$ npm i -g @nestjs/cli
$ nest new project-name2. install test cli tool(insomnia) for restapi / graphql
3. nest command for help
- nest generate controller – nest g c
- nest generate service – nest g s
4. Controller sample fro CRUD(post/get/patch or put/delete)
import {
Controller,
Post,
Get,
Patch,
Delete,
Param,
Body,
Query,
} from '@nestjs/common';
@Controller('movies')
export class MoviesController {
@Post()
create(@Body() movieData) {
console.log(movieData);
return { ...movieData };
}
@Get()
getAll() {
return 'This will return all movies';
}
@Get('search')
search(@Query('year') searchYear: string) {
return `We search for a movie ${searchYear}`;
}
@Get(':id')
getOne(@Param('id') movieId: string) {
return `This will return one movie ${movieId}`;
}
@Patch(':id')
patch(@Param('id') movieId: string, @Body() updateData) {
return {
updateMovie: movieId,
...updateData,
};
}
@Delete(':id')
remove(@Param('id') movieId: string) {
return `This will delete the ${movieId} : movie`;
}
}
5. Service (business logic)
6. dto and input validator (ex- option field : readonly title?: string;)
import { IsString, IsNumber } from 'class-validator';
export class CreateMovieDto {
@IsString()
readonly title: string;
@IsNumber()
readonly year: number;
@IsString({ each: true })
readonly genres: string[];
}- install package for validator : npm i class-validator
- need class-validator annotation of dto when you use whitelist:true option
...
import { ValidationPipe } from '@nestjs/common';
async function bootstrap() {
const app = await NestFactory.create(AppModule);
app.useGlobalPipes(
new ValidationPipe({
whitelist: true,
forbidNonWhitelisted: true,
}),
);
await app.listen(3000);
}
bootstrap();....
import { CreateMovieDto } from './dto/create-movie.dto';
@Controller('movies')
export class MoviesController {
constructor(private readonly moviesService: MoviesService) {}
@Post()
create(@Body() movieData: CreateMovieDto) {
return this.moviesService.create(movieData);
}
....import { IsBoolean, IsString, Length } from 'class-validator';
....
{
@Field((type) => String)
@IsString()
@Length(5, 10)
name: string;
@Field((type) => Boolean, { nullable: true })
@IsBoolean()
isVegan?: boolean;
}
....
7. type transform (ex : input string -> number in controller / service)
- install package for type transform : npm i class-transformer
....
import { ValidationPipe } from '@nestjs/common';
async function bootstrap() {
const app = await NestFactory.create(AppModule);
app.useGlobalPipes(
new ValidationPipe({
whitelist: true,
forbidNonWhitelisted: true,
transform: true,
}),
);
await app.listen(3000);
}
bootstrap();....
@Get(':id')
getOne(@Param('id') movieId: number): Movie {
return this.moviesService.getOne(movieId);
}
....
8. create optional update-dto extends create-dto
- npm i @nestjs/mapped-types
import { PartialType } from '@nestjs/mapped-types';
import { CreateMovieDto } from './create-movie.dto';
export class UpdateMovieDto extends PartialType(CreateMovieDto) {}
9. usage playground of graphql : query and mutation
