NestJS 中管道概述

1import { Controller, Get, Param, ParseIntPipe } from '@nestjs/common';
2import { BooksService } from './books.service';
3
4@Controller('books')
5export class BooksController {
6  constructor(private readonly booksService: BooksService){}
7
8  @Get(':id')
9  findOne(@Param('id') id: string){
10    return this.booksService.findBookById(+id);
11  }
12}

1import { Controller, Get, Param, ParseIntPipe } from '@nestjs/common';
2import { BooksService } from './books.service';
3
4@Controller('books')
5export class BooksController {
6  constructor(private readonly booksService: BooksService){}
7
8  @Get(':id')
9  findOne(@Param('id', ParseIntPipe) id: number){
10    return this.booksService.findBookById(id);
11  }
12}

API 小部件

1{
2    "statusCode": 400,
3    "message": "Validation failed (numeric string is expected)",
4    "error": "Bad Request"
5}

1npm i --save class-validator class-transformer

1import { IsString } from 'class-validator';
2import { Language } from "../entities/books.entity";
3
4export default class CreateBookDto {
5  @IsString()
6  title: string;
7
8  author: string;
9  publicationDate: string;
10  numberOfPages: number;
11  language: Language;
12}

1import { Body, Controller, Post, ValidationPipe } from '@nestjs/common';
2import { BooksService } from './books.service';
3import CreateBookDto from './dto/create-book.dto';
4
5@Controller('books')
6export class BooksController {
7  constructor(private readonly booksService: BooksService) {}
8
9  @Post()
10  create(@Body(new ValidationPipe()) body: CreateBookDto) {
11    return this.booksService.createBook(body);
12  }
13}

API 小部件

1import { Body, Controller, Post, ValidationPipe, UsePipes } from '@nestjs/common';
2
3@Controller('books')
4export class BooksController {
5  constructor(private readonly booksService: BooksService) { }
6
7  @Post()
8  @UsePipes(new ValidationPipe())
9  create(@Body() body: CreateBookDto) {
10    return this.booksService.createBook(body);
11  }
12
13}

1import { Body, Controller, Post, ValidationPipe, UsePipes } from '@nestjs/common';
2
3@UsePipes(new ValidationPipe())
4@Controller('books')
5export class BooksController {
6  constructor(private readonly booksService: BooksService) { }
7
8  @Post()
9  create(@Body() body: CreateBookDto) {
10    return this.booksService.createBook(body);
11  }
12
13}

1import { NestFactory } from '@nestjs/core';
2import { AppModule } from './app.module';
3import { ValidationPipe } from '@nestjs/common';
4
5async function bootstrap() {
6  const app = await NestFactory.create(AppModule);
7  app.useGlobalPipes(new ValidationPipe());
8  await app.listen(3000);
9}
10bootstrap();