1.安装依赖
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| npm i --save class-validator class-transformer
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2.启用全局验证
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import { ValidationPipe } from '@nestjs/common';
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import { HttpExceptionFilter } from './filters/http-execption.filter';
import { TransformInterceptor } from './interceptor/transform.interceptor';
async function bootstrap() {
const app = await NestFactory.create(AppModule);
app.useGlobalPipes(new ValidationPipe())
app.useGlobalInterceptors(new TransformInterceptor())
app.useGlobalFilters(new HttpExceptionFilter())
await app.listen(3000);
}
bootstrap();
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3.修改异常过滤器，返回验证的错误信息
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import { ExceptionFilter, Catch, ArgumentsHost, HttpException, Logger } from '@nestjs/common';
import { Request, Response } from 'express';
import { execPath } from 'process';
@Catch(HttpException)
export class HttpExceptionFilter implements ExceptionFilter {
catch(exception: HttpException, host: ArgumentsHost) {
const ctx = host.switchToHttp();
const response = ctx.getResponse<Response>();
const status = exception.getStatus();
const message = exception.message
const exceptionResponse: any = exception.getResponse()
let validatorMessage = exceptionResponse
if (typeof validatorMessage === 'object') {
validatorMessage = exceptionResponse.message[0]
}
response
.status(status)
.json({
code: status,
message: validatorMessage || message,
});
}
}
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4.工具类增加正则
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export const regPositive: RegExp = /^[1-9]\d*$/
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5.修改dto
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import { IsNotEmpty, Matches } from "class-validator";
import { regPositive } from "src/utils/regex.util";
export class IdDTO {
@Matches(regPositive, {message: '请输入有效 id'})
@IsNotEmpty({message: 'id 不能为空'})
readonly id: number
}
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6.修改controller
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| @Get('detail')
async getOne(@Query() params: IdDTO) {
return this.articleService.getOne(params);
}
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参考文章：
使用class-validator+类验证器实现表单验证
Nestjs-Validation