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

[myabc]

From @caseymct on January 8, 2016 4:16

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.

Copied from original issue: trailblazer/roar#182