added instance.root

Author: mceachen

lib/closure_tree/acts_as_tree.rb

@@ -69,6 +69,11 @@ def root?
         parent_id.nil?
       end
 
+      # Returns self if +root?+ or the root ancestor
+      def root
+        root? ? self : ancestors.last
+      end
+
       # Returns true if this node has no children.
       def leaf?
         children.empty?

lib/closure_tree/version.rb

@@ -1,3 +1,3 @@
 module ClosureTree
-  VERSION = "1.0.0.beta3" unless defined?(::ClosureTree::VERSION)
+  VERSION = "1.0.0.beta4" unless defined?(::ClosureTree::VERSION)
 end

test/dummy/test/unit/tag_test.rb

@@ -100,5 +100,11 @@ def validate_city_tag city
     assert_equal [tags(:california), tags(:united_states), tags(:places)], city.ancestors
     assert_equal [city, tags(:california), tags(:united_states), tags(:places)], city.self_and_ancestors
   end
+
+  def test_root
+    assert_equal tags(:grandparent), tags(:grandparent).root
+    assert_equal tags(:grandparent), tags(:parent).root
+    assert_equal tags(:grandparent), tags(:child).root
+  end
 end