The result of Attachment.latest_attach is unstable if attachments have the same timestamp (#34999).

Patch by Pavel Rosický.


git-svn-id: http://svn.redmine.org/redmine/trunk@20923 e93f8b46-1217-0410-a6f0-8f06a7374b81

Author: vividtone

app/models/attachment.rb

@@ -370,7 +370,7 @@ def self.update_attachments(attachments, params)
   def self.latest_attach(attachments, filename)
     return unless filename.valid_encoding?
 
-    attachments.sort_by(&:created_on).reverse.detect do |att|
+    attachments.sort_by{|attachment| [attachment.created_on, attachment.id]}.reverse.detect do |att|
       filename.casecmp?(att.filename)
     end
   end