I tried to copy and past from Word document to text field using Ruby on Rails.
But all formatting( spaces, bold and other) are disappeared on text filed.
I
Have a go at wrapping your field in your show.html.erb or wherever you want to display it with simple_format, for example:
<%= simple_format(@object.description) %>
See http://apidock.com/rails/ActionView/Helpers/TextHelper/simple_format for more info.