Repetitive controller with all methods nearly identical
Some notes:


I don't know if there is an agreement on the community on that, but I would definitely use the de-facto language of the computer industry (translating the API routes if needed, of course).
I'd write parens on "normal" (non-DSL) method calls.
That's a lot of actions. Why don't you refactor it to have a unique action with a param?


I'd write:

class API::V1::ReceptionController &lt; API::V1::APIController
  before_filter :ensure_document_exists
  WorkerClasses = {:produto =&gt; ProdutoWorker, ....}

  def process
    worker_class = WorkerClasses[params[:key].to_sym]
    if worker_class
      jid = worker_class.perform_async(params[:document])
      render(json: {jid: jid}, :status =&gt; 200)
    else
      render(json: {errors: "Unknown key: #{params[:key]}"}, :status =&gt; 400)
    end
  end


(and change the routes accordingly, of course)