Added some compatibility wrappers for the stable 0.8.x version of Redmine.

lib/rate_sort_helper_patch.rb

@@ -22,6 +22,17 @@ module RateSortHelperPatch
     # Allows more parameters than the standard sort_link and is hard coded to use
     # the RatesController and to have an :method and :update options
     def rate_sort_link(column, caption, default_order, options = { })
+      # 0.8.x compatibility
+      if SortHelper.const_defined? 'SortCriteria'
+        rate_sort_link_trunk_version(column, caption, default_order, options)
+      else
+        rate_sort_link_08_version(column, caption, default_order, options)
+      end
+    end
+
+    private
+    # Trunk version of sort_link.  Was modified in r2571 of Redmine
+    def rate_sort_link_trunk_version(column, caption, default_order, options = { })
       css, order = nil, default_order
     
       if column.to_s == @sort_criteria.first_key
@@ -54,6 +65,40 @@ module RateSortHelperPatch
                      {:href => url_for(url_options),
                        :class => css})
     end
+
+    private
+    # 0.8.x branch of sort_link.
+    def rate_sort_link_08_version(column, caption, default_order, options = { })
+      key, order = session[@sort_name][:key], session[@sort_name][:order]
+      if key == column
+        if order.downcase == 'asc'
+          icon = 'sort_asc.png'
+          order = 'desc'
+        else
+          icon = 'sort_desc.png'
+          order = 'asc'
+        end
+      else
+        icon = nil
+        order = default_order
+      end
+      caption = titleize(Inflector::humanize(column)) unless caption
+      
+      sort_options = { :sort_key => column, :sort_order => order }
+      # don't reuse params if filters are present
+      url_options = params.has_key?(:set_filter) ? sort_options : params.merge(sort_options)
+      
+      ##### Hard code url to the Rates index
+      url_options[:controller] = 'rates'
+      url_options[:action] = 'index'
+      url_options[:user_id] ||= options[:user_id]
+      #####
+
+      link_to_remote(caption,
+                     {:update => options[:update] || "content", :url => url_options, :method => options[:method] || :post},
+                     {:href => url_for(url_options)}) +
+        (icon ? nbsp(2) + image_tag(icon) : '')
+    end
     
   end
 end