Build associations automatically in fields_for helper

Assume you have code in your project like this:
form_for :company do |f|
f.fields_for(:user, f.object.user || f.object.build_user) do |ff|
ff.text_field :name
With get_or_build gem you are able to translate this code to code like this:
form_for :company do |f|
f.fields_for(:user, :build_association => true) do |ff|
ff.text_field :name
Hope you will enjoy this gem! Thank you for your attention!