JSON-API support for :extends/:decorator with has_one

[caseymct]

as per glitter chat:

I have an Event model that has_one host, a User. the User model has it's own (quite large) decorator. It would be great to have

has_one :host, class: User, decorator: UserDecorator

I'd like to avoid doing

has_one :host, class: User, populator: ::Representable::FindOrInstantiate do
  # many properties
end

and duplicating this in every decorator that has a user.

[myabc]

This issue was moved to trailblazer/roar-jsonapi#11