Enable the validation of properties that are not explicitly defined when using the @ValidateNested

I am using NesteJs and I am looking for a way to instruct @ValidateNested to skip properties that are not defined in the class without triggering an error:

property should not exists

Here are my classes:

export default class InitialConfigClass extends SharedInitialConfigClass {
  @Transform((value) => plainToClass(SettingsClass, value))
  @IsNotEmpty()
  @ValidateNested()
  @Type(() => SettingsClass)
  settings!: SettingsClass;
}

export class SettingsClass {
  @IsNotEmpty()
  @ValidateNested()
  @Type(() => FormatSettingsClass)
  first_config!: FormatSettingsClass;

  @IsNotEmpty()
  @ValidateNested()
  @Type(() => FormatSettingsClass)
  second_config!: FormatSettingsClass;

  [key: string]: any;
}

Purpose:

  • I want to be able to include additional properties under the settings object without causing ValidateNested to throw an error, and without having to define them in SettingClass
typescriptnestjsdtoclass-validatorclass-transformer

Answer №1

To enable the skipMissingProperties option within the ValidateNested decorator, modify your code as follows:


export default class CustomInitialConfigClass extends BaseInitialConfigClass {
  @Transform((value) => plainToClass(SettingsClass, value))
  @IsNotEmpty()
  @ValidateNested()
  @Type(() => SettingsClass)
  settings!: SettingsClass;
}

export class SettingsClass {
  @IsNotEmpty()
  @ValidateNested({ skipMissingProperties: true })
  @Type(() => FormatSettingsClass)
  first_config!: FormatSettingsClass;

  @IsNotEmpty()
  @ValidateNested()
  @Type(() => FormatSettingsClass)
  second_config!: FormatSettingsClass;

  [key: string]: any;
}

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