The partial making up the form

_form.html.haml

#user_details_base.hide= render "invitee_form"  

- form_tag invite_other_users_path(@user), 
                :method => :put, :id => "form1", :class => "user_invite" do 
  .user_details
    = render "invitee_form"  
  .add_user_button
    = link_to "Add another", "#", :id => "add_user"
  
  %span
    = submit_tag "Submit" 
    = label_tag "By clicking submit each invitee will be sent an invitation"