feat: support dot notation for nested objects in @Expose decorator

[NoNameProvided]

Currently @Expose decorator supports only flat re-naming, there were multiple requests to add support nested exposing.

Example:

class Example {
  @Expose('user.fullName')
  name: string = 'Test Name';
}

const raw = { user: { fullName: 'Test Name' }}
const instance = new Example();

plainToClass(Example, raw) // returns Example { name: 'Test Name' }
classToPlain(instance) // returns { user: { fullName: 'Test Name' }}

[ziadalzarka]

Any updates?

[sadra]

This feature not implemented yet?

[Dracks]

I would need this feature in something I'm doing, and I think I will discard the class-transformer for what I'm doing right now, Maybe is better to have the option of an array, more than . notation, something like
expose(["user","fullName"])

dotNotation should work for my case, but I think it's allways more safe to use an array.

[dimas-cyriaco]

This would be really useful for working with json:api objects.