<%= 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 %>