Fixes another issue related to ancestors in ordered trees. Closes benedikt#39

Author: benedikt

lib/mongoid/tree/ordering.rb

@@ -47,7 +47,7 @@ module Ordering
       #
       # @return [Mongoid::Criteria] Mongoid criteria to retrieve the document's ancestors
       def ancestors
-        base_class.unscoped.where(:_id.in => parent_ids)
+        base_class.unscoped { super }
       end
 
       ##

spec/mongoid/tree/ordering_spec.rb

@@ -177,6 +177,20 @@
 
         node(:leaf).ancestors.to_a.should == [node(:root), node(:level_1_b), node(:level_2_a)]
       end
+
+      it "should return the ancestors in correct order even after rearranging" do
+        setup_tree <<-ENDTREE
+          - root:
+            - child:
+              - subchild
+        ENDTREE
+
+        child = node(:child); child.parent = nil; child.save!
+        root = node(:root); root.parent = node(:child); root.save!
+        subchild = node(:subchild); subchild.parent = root; subchild.save!
+
+        subchild.ancestors.to_a.should == [child, root]
+      end
     end
   end