[rygel] tracker: Use property function for sorting

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 15b06eba3cea98c1ee04bad684fa53cc21fdc3ab
Author: Sunil Mohan Adapa <sunil medhas org>
Date:   Sun Dec 5 07:18:27 2010 +0530

    tracker: Use property function for sorting
    
    Tracker claims to be more efficient when using property functions instead
    of variables. Property functions work just fine for sorting too. This
    patch uses property function instead of variable for modified date
    sorting.

 .../tracker/rygel-tracker-search-container.vala    |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/src/plugins/tracker/rygel-tracker-search-container.vala b/src/plugins/tracker/rygel-tracker-search-container.vala
index de5934b..335bbaf 100644
--- a/src/plugins/tracker/rygel-tracker-search-container.vala
+++ b/src/plugins/tracker/rygel-tracker-search-container.vala
@@ -35,8 +35,7 @@ public class Rygel.Tracker.SearchContainer : Rygel.MediaContainer {
     private const string TRACKER_SERVICE = "org.freedesktop.Tracker1";
     private const string RESOURCES_PATH = "/org/freedesktop/Tracker1/Resources";
 
-    private const string MODIFIED_PREDICATE = "nfo:fileLastModified";
-    private const string MODIFIED_VARIABLE = "?modified";
+    private const string MODIFIED_PROPERTY = "nfo:fileLastModified";
 
     public SelectionQuery query;
     public ItemFactory item_factory;
@@ -67,10 +66,6 @@ public class Rygel.Tracker.SearchContainer : Rygel.MediaContainer {
                                         (SelectionQuery.ITEM_VARIABLE,
                                          "a",
                                          item_factory.category));
-        our_triplets.add_triplet (new QueryTriplet
-                                        (SelectionQuery.ITEM_VARIABLE,
-                                         MODIFIED_PREDICATE,
-                                         MODIFIED_VARIABLE));
 
         foreach (var chain in this.item_factory.key_chains) {
             var variable = SelectionQuery.ITEM_VARIABLE;
@@ -82,10 +77,15 @@ public class Rygel.Tracker.SearchContainer : Rygel.MediaContainer {
             variables.add (variable);
         }
 
+        var order_by = MODIFIED_PROPERTY +
+                       "(" +
+                       SelectionQuery.ITEM_VARIABLE +
+                       ")";
+
         this.query = new SelectionQuery (variables,
                                          our_triplets,
                                          filters,
-                                         MODIFIED_VARIABLE);
+                                         order_by);
 
         try {
             this.resources = Bus.get_proxy_sync