Default value of DTO Properties are not working with IntersectionType and ValidationPipe about mapped-types

[tosiek88]

I find out what was wrong:
I shouldn't use

import { IntersectionType } from '@nestjs/swagger'

instead of that use from mapped-types

import { IntersectionType } from '@nestjs/mapped-types'

mapped-types is working as expect.

  @Post()
  @UsePipes(new ValidationPipe({ transform: true }))
  create(@Body('dto') dto: combineDto) {
    Logger.debug(dto);
    return 'OK';
  }

Response:

OK
<!-- POST http://localhost:3000/ -->
<!-- HTTP/1.1 201 Created -->
<!-- X-Powered-By: Express -->
<!-- Content-Type: text/html; charset=utf-8 -->
<!-- Content-Length: 2 -->
<!-- ETag: W/"2-nOO9QiTIwXgNtWtBJezz8kv3SLc" -->
<!-- Date: Mon, 26 Oct 2020 19:44:36 GMT -->
<!-- Connection: keep-alive -->
<!-- Request duration: 0.053106s -->

[Nest] 15392   - 10/26/2020, 8:48:10 PM   [NestFactory] Starting Nest application...
[Nest] 15392   - 10/26/2020, 8:48:10 PM   [InstanceLoader] AppModule dependencies initialized +13ms
[Nest] 15392   - 10/26/2020, 8:48:10 PM   [RoutesResolver] AppController {}: +6ms
[Nest] 15392   - 10/26/2020, 8:48:10 PM   [RouterExplorer] Mapped {, GET} route +3ms
[Nest] 15392   - 10/26/2020, 8:48:10 PM   [RouterExplorer] Mapped {, POST} route +2ms
[Nest] 15392   - 10/26/2020, 8:48:10 PM   [NestApplication] Nest application successfully started +3ms
[Nest] 15392   - 10/26/2020, 8:48:10 PM    Listen to port : 3000 +5ms
[Nest] 15392   - 10/26/2020, 8:49:12 PM   Object:
{
  "table": [
    1,
    2,
    3,
    4
  ],
  "table2": [
    1,
    2,
    3,
    4
  ],
  "text": "test"
}
 +61848ms

[tosiek88]

So looks like I was too fast, because today morning I realize that Swagger will not work with that :D

[kamilmysliwiec]

Lets' track this here nestjs/swagger#1015

[viczam]

The issue is still present on "@nestjs/mapped-types": "^0.1.1".

I have a use case similar to the one above, except I'm validating query params.

[kamilmysliwiec]

If you face any issue, please, create a separate ticket with a minimal reproduction repository.