create-chuntianxiaozhu/template-nestjs-mysql/api/utils/validator.ts

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import {
  ValidationArguments,
  ValidationOptions,
  ValidatorConstraint,
  ValidatorConstraintInterface,
  registerDecorator,
} from 'class-validator';

export function IsCommaSplit(validationOptions?: ValidationOptions) {
  return function (object: Object, propertyName: string) {
    registerDecorator({
      name: 'isCommaSplit',
      target: object.constructor,
      propertyName: propertyName,
      options: validationOptions,
      validator: {
        validate(value: any) {
          return typeof value === 'string' && value.split(',').length > 0; // you can return a Promise<boolean> here as well, if you want to make async validation
        },
      },
    });
  };
}

/**
 * 自定义类校验器
 */
@ValidatorConstraint({ name: 'customIsEnum', async: false })
export class CustomIsEnum implements ValidatorConstraintInterface {
  validate(value: any, args?: ValidationArguments): boolean {
    if (!value) {
      return false;
    }
    return args.constraints.indexOf(value) > -1;
  }

  defaultMessage(): string {
    return '值不对';
  }
}