Fix bug.

app/controllers/archives_controller.rb

@@ -217,8 +217,7 @@ class ArchivesController < ApplicationController
 		file_id = params[:file]
 		file = ArchiveFileMultiple.find(file_id) rescue nil
 		if !file.nil? && file.file.present?
-			file.download_count = file.download_count + 1
-			file.save
+			file.inc(download_count: 1)
 			@url = file.file.url
 			begin
 				@path = file.file.file.file rescue ""

app/models/archive_file_multiple.rb

@@ -8,7 +8,7 @@ class ArchiveFileMultiple
   field :file_title, localize: true
   # field :description
   field :download_count, type: Integer, default: 0
-  field :choose_lang, :type => Array, :default => ["en","zh_tw"]
+  field :choose_lang, :type => Array, :default => I18n.available_locales.map{|l| l.to_s}
 
   field :should_destroy, :type => Boolean
   field :sort_number, :type => Integer
@@ -19,7 +19,7 @@ class ArchiveFileMultiple
     self.choose_lang.include?(lang)
   end
 
-  belongs_to :archive_file
+  belongs_to :archive_file, index: true
 
   # has_many :archive_file_multiple_langs, :autosave => true, :dependent => :destroy
 

app/views/admin/archive_files/_form_file.html.erb

@@ -37,13 +37,13 @@
       	<% @site_in_use_locales.each do |locale| %>
         <li>
           <label class="checkbox">
-          	<%= check_box_tag "archive_file[archive_file_multiples_attributes][#{( form_file.new_record? ? 'new_archive_file_multiples' : "#{i}" )}][choose_lang][]", locale, form_file.choose_lang.include?(locale.to_s) %>
+          	<%= check_box_tag "#{f.object_name}[choose_lang][]", locale, form_file.choose_lang.include?(locale.to_s) %>
 						<%= t(locale.to_s) %>
           </label>
         </li>
         <% end %>
       </ul>
-      <%= hidden_field_tag "archive_file[archive_file_multiples_attributes][#{( form_file.new_record? ? 'new_archive_file_multiples' : "#{i}" )}][choose_lang][]", '' %>
+      <%= hidden_field_tag "#{f.object_name}[choose_lang][]", '' %>
     </span>
 
     <% if form_file.new_record? %>