Show last update datetime (last attachment added) on document list (#4232).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3095 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/documents_controller.rb

@@ -28,7 +28,7 @@ class DocumentsController < ApplicationController
     documents = @project.documents.find :all, :include => [:attachments, :category]
     case @sort_by
     when 'date'
-      @grouped = documents.group_by {|d| d.created_on.to_date }
+      @grouped = documents.group_by {|d| d.updated_on.to_date }
     when 'title'
       @grouped = documents.group_by {|d| d.title.first.upcase}
     when 'author'

app/models/document.rb

@@ -34,4 +34,12 @@ class Document < ActiveRecord::Base
       self.category ||= DocumentCategory.default
     end
   end
+  
+  def updated_on
+    unless @updated_on
+      a = attachments.find(:first, :order => 'created_on DESC')
+      @updated_on = (a && a.created_on) || created_on
+    end
+    @updated_on
+  end
 end

app/views/documents/_document.rhtml

@@ -1,3 +1,3 @@
 <p><%= link_to h(document.title), :controller => 'documents', :action => 'show', :id => document %><br />
 <% unless document.description.blank? %><%=h(truncate(document.description, :length => 250)) %><br /><% end %>
-<em><%= format_time(document.created_on) %></em></p>
+<em><%= format_time(document.updated_on) %></em></p>