如何验证nestjs中的直接function调用？

Question

I am trying to send a direct function call, and I set the DTO, but not work. here is the code (Send is my DTO) in my controller:

 @Post('/Send')
  async SendE(body: Send) {
    const mail = await this.messageProducer.SendMessage(body);
    return mail;
  }

I make a direct call to SendE function here:

  @MessagePattern('Notification')
  async readMessage(@Payload() message: any, @Ctx() context: KafkaContext) {
    const messageString = JSON.stringify(context.getMessage().value);
    const toJson = JSON.parse(messageString);
    await this.SendE(toJson);
  }

I want the "Send" DTO can validate the "toJson", but it does not work. here is what my DTO looks like:

export class Send{
  @IsString()
  @ApiProperty({ required: true })
  MessageID: string;
  }

here is what the toJson looks like:

{
  MessageID: 123
}

If I send a non-string MessageID, it can pass the DTO. Please help

Answer 1

You have to enable validationPipe to make DTO's, There are 2 approaches according to the docs of NestJS . The ValidationPipe is exported from @nestjs/common .

1. Globally in your main.ts :

// validate incoming requests
app.useGlobalPipes(
  new ValidationPipe({
    transform: true,
  })
);

2. Per controller

@Post()
@UsePipes(new ValidationPipe({ transform: true }))
async create(@Body() createCatDto: CreateCatDto) {
  this.catsService.create(createCatDto);
}