What is the best way to nest properties ?

[victorantunesb]

class DestinataryVOModel {

   @Expose({ name: 'name' })
   destinataryName: string
    
   @Expose({ name: 'email' })
   destinataryEmail: string

}

class Destinatary {

  @Expose({ name: 'id' })
  destinataryId: number 

  @Type(() => DestinataryVOModel)
  destinatary: DestinataryVOModel

  }

input = {
    id: 1,
    name: 'any_name',
    email: '[email protected]'
}

expectedOutput = {
    destinataryId: 1,
    destinatary: {
         destinataryName: 'any_name'
         destinataryEmail:  '[email protected]'
    }
}

but this doesn't work

[diffy0712]

Hello,

in your plain object you should have the destinatary name and email in an object under destinatary key.

input = {
    id: 1,
    destinatary: {
         name: 'any_name'
         email:  '[email protected]'
    }
}

[victorantunesb]

@diffy0712 , Thanks for the answer!
class transform cannot then create the object? must it already exist previously?

[diffy0712]

It can create the object, but the plain should contain the key for the object. Otherwise, if your class would have more than one relationship, how would it know where to assign the name and fhe email?
Ex: you have destinatary, and destinatary2. if the plain only has email and name on the root, the transformer would not be able to tell if it belongs to destinatary or destinatars2

But, with custom transformers you can transform however you want. you can check the docs for @Transform decorator.