archive module: add sort feature to achive files

app/models/mongoid/sortable.rb

@@ -21,7 +21,7 @@ module Mongoid
     private
 
     def set_sort_number
-      if self.sort_number.nil?
+      if self.new? && self.sort_number.nil?
         last_record = self.class.desc(:sort_number).first
         if last_record
           self.sort_number = (last_record.sort_number + 10) / 10 * 10

vendor/built_in_modules/archive/app/models/archive_file_multiple.rb

@@ -2,6 +2,7 @@ class ArchiveFileMultiple
 
   include Mongoid::Document
   include Mongoid::Timestamps
+  include Mongoid::Sortable
 
   mount_uploader :file, AssetUploader
 
@@ -11,6 +12,8 @@ class ArchiveFileMultiple
 
   field :should_destroy, :type => Boolean
 
+  default_scope asc(:sort_number)
+
   def choose_lang_display(lang)
     self.choose_lang.include?(lang)
   end

vendor/built_in_modules/archive/app/views/panel/archive/back_end/archive_files/_form.html.erb

@@ -82,6 +82,7 @@
 				<table class="table table-condensed">
 					<thead>
 						<tr>
+              <th>排序數</th>
 							<th>File</th>
 							<th>File Name</th>
 							<th class="span2"><%= t('呈現語系')%></th>
@@ -137,7 +138,9 @@
 			var new_id = $(this).prev().attr('value');
 			var old_id = new RegExp("new_archive_file_multiples", "g");
 			$(this).prev().attr('value', parseInt(new_id) + 1);
-			$(this).parents('table').append(("<%= escape_javascript(add_attribute 'form_file', f, :archive_file_multiples) %>").replace(old_id, new_id));
+      var new_form_file = $("<%= escape_javascript(add_attribute 'form_file', f, :archive_file_multiples) %>".replace(old_id, new_id));
+      new_form_file.find('input#archive_file_archive_file_multiples_attributes_'+new_id+'_sort_number').val(new_id * 10)
+			$(this).parents('table').append(new_form_file);
 		});
 
 		$('.archive_file_multiples_block a.delete').live('click', function(){

vendor/built_in_modules/archive/app/views/panel/archive/back_end/archive_files/_form_file.html.erb

@@ -1,6 +1,13 @@
 <% # encoding: utf-8 %>
 
 		<tr id="<%= "archive_file_multiple_#{form_file.id}" if !form_file.new_record? %>" class='list_item'>
+      <td>
+        <div class="control-group">
+          <div class="controls">
+            <%= f.text_field :sort_number %>
+          </div>
+        </div>
+      </td>
 			<td>
 				<div class="control-group">
 					<div class="controls">