Relationship routes are created without adding them in the routes.rb

I've defined the following Resource:

class CommentResource < BaseResource
      has_one :activity
      has_one :user
end

 class ActivityResource < BaseResource
      has_many :comments
end

jsonapi_resources :activities, only: %w(index show)
jsonapi_resources :comments, only: %w(create destroy index show)

And checking with rake routes I see that it also created all the relationship/related routes for both Activity and Comment even if I haven't added jsonapi_links / jsonapi_related_resources in the routes file

Issue に示されているリソース宣言と routes.rb の設定から始め、次に rake routes で出力を再現します。ActivityResource と CommentResource の relationship route と related route がどのように生成されるかを追跡します。relationship の宣言と明示的に設定された route オプションに route 一覧が一致すれば完了です。