How to map when using custom generic type in TS

[renatoargh]

Hello 👋

Currently I have this:

export default class Email { // <--- destination
  @AutoMap()
  public readonly id: string

  @AutoMap()
  public readonly address: string

  @AutoMap()
  public readonly contactPerson: Nullable<string>

  constructor(
    _id: string,
    _address: string,
    _contactPerson: Nullable<string> = null,
  ) {
    this.id = _id
    this.address = _address
    this.contactPerson = _contactPerson
  }
}

export class ApiCreateContactEmail { // <--- source
  @AutoMap()
  @ApiProperty({
    example: 'eb5b4068-0322-43fb-8233-fa8dd708c4dc',
    required: true,
    description: 'Unique identifier for the email',
    format: 'uuid',
  })
  id: string

  @AutoMap()
  @ApiProperty({
    example: examples.email,
    required: true,
    description: 'Email address',
  })
  address: string

  @AutoMap()
  @ApiProperty({
    example: examples.person2.name,
    required: false,
    description: 'Contact person for the address',
  })
  contactPerson: Nullable<string>
}

Where Nullable is this: type Nullable<T> = T | null

When I try to convert them, I get this ugly error:

Mapping not found for source Object and destination Object
Mapping is not found for function Object() { [native code] } and function Object() { [native code] }

If I comment out contactPerson then it works just fine so I assume the problem originates when I use Nullable. Because it is a TS type and not a class I cannot register a conversion mechanism.

What would be the correct way to fix this?

PS.: Mapper configuration is super simple:

export const mapper = createMapper({
  name: 'contactMapper',
  pluginInitializer: classes,
})

mapper.createMap(ApiCreateContactEmail, Email)

Thanks a lot! :)

[micalevisk]

what if you use

  @AutoMap({ typeFn: () => String })
  @ApiProperty({
    example: examples.person2.name,
    required: false,
    description: 'Contact person for the address',
  })
  contactPerson: Nullable<string>

https://automapperts.netlify.app/docs/plugins-system/classes-limitations/#strict-mode

[renatoargh]

thank you, this works. I was actually using this already but felt like a workaround. If this is the correct way then it's fine! Thank for your reply

[micalevisk]

glad to help you.

Can you please mark my message as an answer to let people know about it ^^?