CODEWITHSUNDEEP
javascriptnode.jstypescriptnestjs
theboyonfire
theboyonfire

Reputation: 595

How to extend more than one dto class in Nestjs

I am new to nest.js and have a question about it.

I want to extend more than one Dto to my main dto class, but I know it is not possible to extend more than 2 dto classes. Do you have any idea how to do it ?

Here is my main dto class:

export class CarDto extends PickupLocationDto {
  @ApiProperty({ example: 'Aventador', description: 'The car name' })
  readonly modelName: string;
}

Recently I am only able to extend it from PickupLocationDto class, but I want to extend one more dto class to this CarDto class.

Any help is appreciated.

Upvotes: 3

Views: 10093

Answers (3)

Tunji Abioye
Tunji Abioye

Reputation: 69

You can also use the extend keyword to extend the DTO class

    export class Dto3 extends Dto1 {
      public readonly dtoField: Dto2;
    }

Upvotes: 0

theboyonfire
theboyonfire

Reputation: 595

Since I use swagger, using @nestjs/mapped-types package does not show all the variables from intersected dtos. therefore, I use IntersectionType from swagger

import { ApiProperty, IntersectionType } from '@nestjs/swagger';

export class Dto3 extends IntersectionType(
  Dto1,
  Dto2,
) {}

Upvotes: 11

Sirwan Afifi
Sirwan Afifi

Reputation: 10824

You can use mapped-types to do that, first you will need to install the package (yarn add @nestjs/mapped-types) then use IntersectionType just like this:

import { IntersectionType } from '@nestjs/mapped-types';

export class Dto3 extends IntersectionType(
  Dto1,
  Dto2,
) {}

Upvotes: 4

Related Questions