Allow Enumerables to be used with "where" filter.

lib/jekyll/filters.rb

@@ -219,7 +219,8 @@ module Jekyll
     #
     # Returns the filtered array of objects
     def where(input, property, value)
-      return input unless input.is_a?(Array)
+      return input unless input.is_a?(Enumerable)
+      input = input.values if input.is_a?(Hash)
       input.select { |object| item_property(object, property) == value }
     end
 

test/test_filters.rb

@@ -172,10 +172,13 @@ class TestFilters < Test::Unit::TestCase
 
     context "where filter" do
       should "return any input that is not an array" do
-        assert_equal Hash.new, @filter.where(Hash.new, nil, nil)
         assert_equal "some string", @filter.where("some string", "la", "le")
       end
 
+      should "filter objects in a hash appropriately" do
+        assert_equal 1, @filter.where({"a"=>{"color"=>"red"}, "b"=>{"color"=>"blue"}}, "color", "red").length
+      end
+
       should "filter objects appropriately" do
         assert_equal 2, @filter.where(@array_of_objects, "color", "red").length
       end