#NestJS class-validator generic enum

2 messages · Page 1 of 1 (latest)

silver pelican
#

As I am aware I should use mixin pattern here, but I cant wrap my head around how to do it

silver pelican
# 
type Constructor<T = object> = new (...args: any[]) => T;

export function SortQueryDto<T extends Constructor, K extends keyof T>(
  classRef: T,
  keys: readonly K[],
): T {
  const PossibleValues = keys.reduce((a, v) => ({ ...a, [v]: v }), {});
  class MixinSortQuery extends classRef {
    @IsEnum(PossibleValues)
    @IsNotEmpty()
    field: K;

    @IsEnum(SortDirection)
    @IsNotEmpty()
    direction: SortDirection;
  }

  return MixinSortQuery;
}

const SortQueryDtoHost = SortQueryDto(Task, [
  'createdAt',
  'updatedAt',
  'title',
]);