Added BSON::ObjectId#to_ary

lib/bson/types/object_id.rb

@@ -116,6 +116,13 @@ module BSON
       @data.dup
     end
 
+    # Returns the object id as a single element in an array for use with Kernel#Array
+    #
+    # @return [Array]
+    def to_ary
+      [ self ]
+    end
+
     # Given a string representation of an ObjectId, return a new ObjectId
     # with that value.
     #

test/bson/object_id_test.rb

@@ -135,4 +135,10 @@ class ObjectIdTest < Test::Unit::TestCase
     id = ObjectId.new
     assert_equal({"$oid" => id.to_s}, id.as_json)
   end
+
+  def test_to_ary
+    id = ObjectId.new
+    assert_equal [id], id.to_ary
+    assert_equal Array(id), id.to_ary
+  end
 end