ValidateNested not working

Hello,

i have something like this:

class Day
{
    @IsMilitaryTime()
    from: string;

    @IsMilitaryTime()
    to: string;
}

export class DailyCalendar
{
    @IsDefined() // do i need it?
    @ValidateNested()
    monday: Day;
    ...
}

When calling the route with this body: { "monday": { "from": "foo" } } or { "monday": { } } it doesn’t throw an error. Also when not using @IsDefined() i can call the route without monday property and it doesn’t throw an error.

The class will be created, but not validated.

[ericzon]

Well, I’ve just solved my problem, I share the solution:

DummyDto (main class)

import { Type } from 'class-transformer';
import { Contains, ValidateNested } from 'class-validator';

import { SubDto } from './sub.dto';

export class DummyDto {
    @Contains("hello")
    public stringAttr: string;
    @ValidateNested()
    @Type(() => SubDto)
    public subAttr: SubDto;
}

SubDto file:

import { Contains } from 'class-validator';

export class SubDto {
    @Contains("eric")
    public sub1: string;
    public sub2: string;
}

This dto works:

{
	"stringAttr": "hello",
	"subAttr": {
		"sub1": "eric",
		"sub2": "subhello2"
	}
}

This dto fails:

{
	"stringAttr": "hello",
	"subAttr": {
		"sub1": "aaa",
		"sub2": "subhello2"
	}
}

Note for NestJs users:

The ValidatorPipe is very similar to the existing on docs.

I hope this helps somebody.

[ruiming]

I have the same problem. This work for me:

export class ICreateOrUpdateActivity implements IActivity {
  @IsString() title: string
  @ValidateNested() @Type(() => ICreateOrUpdateActivityPrize) prizes: ICreateOrUpdateActivityPrize[]
  @ValidateNested() @Type(() => ICreateOrUpdateActivityReply) replies: ICreateOrUpdateActivityReply[]
}

@Type is from module class-transformer.