Search backward compatibility

app/models/dmsf_file.rb

@@ -82,6 +82,7 @@ class DmsfFile < ActiveRecord::Base
 
   acts_as_event :title => Proc.new { |o| o.name },
                 :description => Proc.new { |o| 
+                  if (Rails::VERSION::MAJOR > 3)
                     desc = Redmine::Search.cache_store.fetch("DmsfFile-#{o.id}")                  
                     if desc
                       Redmine::Search.cache_store.delete("DmsfFile-#{o.id}")
@@ -89,6 +90,9 @@ class DmsfFile < ActiveRecord::Base
                     else
                       o.description
                     end
+                  else
+                    o.description
+                  end
                 },
                 :url => Proc.new { |o| {:controller => 'dmsf_files', :action => 'show', :id => o} },
                 :datetime => Proc.new { |o| o.updated_at },