has_one SQL not using LIMIT when using include

I have the following model:

class Foo < ActiveRecord::Base
  has_many :messages
  has_one :last_message, -> { order(created_at: :desc) }, class_name: 'Message'
end

and following resource:

class FooResource < JSONAPI::Resource
  has_one :last_message, class_name: 'Message'
end

When I request /foo/1/last-message it generates the following SQL:

SELECT  `messages`.* FROM `messages` WHERE `messages`.`foo_id` = 1  ORDER BY `messages`.`created_at` DESC LIMIT 1

But when I request /foo/1?include=last-message, the SQL doesnt append LIMIT

SELECT `messages`.* FROM `messages` WHERE `messages`.`foo_id` IN (1)  ORDER BY `messages`.`created_at` DESC

Riproduci le due richieste mostrate nell’issue e confronta l’SQL generato per la relazione diretta e la relazione inclusa. Segui il punto di ingresso del caricamento dell’include per trovare dove viene applicato lo scope has_one, quindi verifica che la query inclusa mantenga il limite a un singolo record e l’ordinamento.