Custom Validator called multiple time

[Dsantosjaime]

Description

My Custom Validator:

@Injectable()
@ValidatorConstraint({ name: 'isValidSiteIds', async: true })
export class IsValidSiteIdsValidator implements ValidatorConstraintInterface {
    constructor(private readonly SiteService: SiteService) { }

    async validate(siteIds: string[], validationArguments: ValidationArguments) {
        const groupId = validationArguments.object['groupId'];
        log(siteIds, groupId, validationArguments);

        const sitesInGroup = await this.SiteService.findAll({ groupId, id: { in: siteIds } });
        log(sitesInGroup.length === siteIds.length);
        return sitesInGroup.length === siteIds.length;
    }
}

registerDecorator({
    name: 'isValidSiteIds',
    target: Object,
    propertyName: 'siteIds',
    options: { message: 'Un ou plusieurs sites spécifiés ne correspondent pas au groupe.' },
    validator: IsValidSiteIdsValidator,
});

My DTO:

export class ClientDto {
    @ApiProperty()
    @IsEnum(ClientRole)
    role: ClientRole;

    @ApiProperty({ type: [String] })
    @IsArray()
    @IsString({ each: true })
    @ValidateIf(o => ... )
    @ArrayNotEmpty({ message: ... })
    @Validate(IsValidSiteIdsValidator)
    siteIds: string[]

    @ApiProperty()
    @IsString()
    groupId: string
}

export class CreateClientDto extends CreateUserDto {
    @ApiProperty()
    @Type(() => ClientDto)
    @ValidateNested()
    @IsNotEmpty()
    client: ClientDto;
}

Expected behavior

I want my validator to check my field "siteIds".

Actual behavior

My validator is called two times.
I logged "ValidationArguments" and the first time it gave me :

{
  targetName: 'ClientDto',
  property: 'siteIds',
  object: ClientDto {
    role: 'MANAGER',
    siteIds: [ '64ba804f35dc69d2d58f6585' ],
    groupId: '64b6a9910c437e88fb1dfa77'
  },
  value: [ '64ba804f35dc69d2d58f6585' ],
  constraints: undefined
}

and the second time:

{
  targetName: 'CreateClientDto',
  property: 'siteIds',
  object: CreateClientDto {
    email: 'generic@email.com',
    firstname: 'generic',
    lastname: 'generic',
    phone: '+33000000000',
    client: ClientDto {
      role: 'MANAGER',
      siteIds: [Array],
      groupId: '64b6a9910c437e88fb1dfa77'
    }
  },
  value: undefined,
  constraints: undefined
}