// my-entity.entity.ts
import { Entity, Column, PriamryGeneratedColumn } from 'typeorm'
import { IsString, IsNumber } from 'class-transformer'

@Entity()
export class MyEntity {
  @PrimaryGeneratedColumn()
  id: number;

  @IsString()
  @Column()
  type: string;

  @IsNumber()
  @Column()
  age: number;
}

// my-entity.filter.dto.ts
import { TakeType } from '@miaooo/nestjs-take-type'
import { IsString, IsNumber } from 'class-transformer'

export class MyEntityFilerDTO extends TakeType(
  MyEntity,
  // required params
  ['type'],
  // optional params
  ['age'],
)  {}

// this is equal to
export class MyEntityFilerDTO {
  @IsString()
  type!: string;

  @IsOptional()
  @IsNumber()
  age?: number;
}