Bug fix on Collection#rename

lib/mongo/collection.rb

@@ -635,6 +635,8 @@ module Mongo
     #
     # @param [String] new_name the new name for this collection
     #
+    # @return [String] the name of the new collection.
+    #
     # @raise [Mongo::InvalidNSName] if +new_name+ is an invalid collection name.
     def rename(new_name)
       case new_name
@@ -656,6 +658,7 @@ module Mongo
       end
 
       @db.rename_collection(@name, new_name)
+      @name = new_name
     end
 
     # Get information on the indexes for this collection.

test/collection_test.rb

@@ -67,6 +67,17 @@ class TestCollection < Test::Unit::TestCase
     assert_equal 5, @@db.collection("test.foo").find_one()["x"]
   end
 
+  def test_rename_collection
+    @@db.drop_collection('foo1')
+    @@db.drop_collection('bar1')
+
+    @col = @@db.create_collection('foo1')
+    assert_equal 'foo1', @col.name
+
+    @col.rename('bar1')
+    assert_equal 'bar1', @col.name
+  end
+
   def test_nil_id
     assert_equal 5, @@test.insert({"_id" => 5, "foo" => "bar"}, {:safe => true})
     assert_equal 5, @@test.save({"_id" => 5, "foo" => "baz"}, {:safe => true})