Nested Param Helpers - using *:use* inside a Grape::API::Helper

Hello guys,

I'm trying to reuse param definition in my helpers but the use :param method doesn't seem to work inside Grape::API::Helpers.

The use case is I have two different models that include a third model like this:

module Animal
  extend Grape::API::Helpers

  params :animal do
    requires :mammal, Boolean
    requires :other_fields, String
  end
end

module Dog
  extend Grape::API::Helpers

  params :dog do
    requires :breed, String
    requires :animal do
      use :animal
    end
  end
end

Unfortunately inside Dog grape complains that it cannot find params for :animal. I've tried extending and including the Animal module with no success.

Also the helpers method is not included by Grape::API::Helpers.

Is there any way I can do this?

Start by reproducing the nested parameter example from the issue, focusing on Grape::API::Helpers and the use :animal call inside Dog. Trace how parameter definitions are registered and resolved for helpers, then verify that the nested call finds Animal's definition and that the existing parameter behavior remains intact.