text_field,form

http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#M001197

 <% form_tag :action => 'edit_all' do %>
   <% for @user in @users %>      <= 一定要用@user, for iterator 才能這樣用
       <%= text_field('user[]', 'name') %> <= []會自己讓他塞id, 變成 <input type="text" value="ilake" size="30" name="user[1][name]" id="user_1_name"/>
       <% fields_for @user.couple do |couple| %>
           <%= couple.text_field :name %>
       <% end %>
   <% end %>
   <%= submit_tag 'EDIT_ALL'%>
 <% end %>