present nestedly?

[limbo-lab]

I expect each response should contains code & msg in addition to normal data. Looks like this:

{
    code: 1000,
    msg: "OK",
    data: {
        // normal data goes here if exists
    }
}

I have this code:

resources :books do
    get do
        present :code, 1000
        present :msg, "OK"
        present :data do
            present :items, Book.all, with: Entities::Book
        end
    end
end

Of course this won't work & not DRY. Is there an approach instead?

[lanrion]

I define a method:

    def format_result(result, return_code=0)
      {
        API::RESPONSE_CODE   => return_code,
        API::RESPONSE_RESULT => result.as_json
      }
    end

and then to use it like this:

format_result(::Entities::User.represent(agents))

grape-entity has a root method, but it looks doesn't work in subclass。

Anybody else have better solution？

[limbo-lab]

This is exactly what I want, thanks so much!

[dblock]

This works. I encourage you to use a proper presenter framework like grape-entity or Roar and to stick to a JSON format like HAL.