<%= form_for :file, :url => update_file_admin_design_path(:type => type, :object_id => object.id), :remote => true, :method => :post do |f| %>
  <div id='post-body-content'>
    <%= f.text_area :content, :class => 'middle', :value => object.file.read.force_encoding('UTF-8') %>
  </div>
  <div class="form-actions form-fixed pagination-right">
    <button class="btn btn-primary"><%= t(:save) %></button>
  </div>
<% end %>