[Rails] form remote only if new record.

I want submit a form via ajax only if i have a new record, so I've set:
(I'm using simple_form)

= simple_form_for @document, :html => { :multipart => true }, :remote
=> @document.new_record? ? true : false, do |f|
= render 'shared/error_messages', :object => @document

= field_set_tag t('document') do
.block
.column.span-24
.inputs
= f.input :name
= f.input :description
= f.input :doc, :as => :file
= f.input :company_id, :input_html => { :value =>
params[:company_id] }, :as => :hidden if @document.new_record?

.actions
= f.button :submit

It works if the validations are all ok but if a validation fails, I
correct the error and then submit again, remote is no longer valid
because, I think, new_record? return false.
Isn't it?

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