Make filter_parameters work correctly with array parameters.

actionpack/lib/action_controller/base/filter_parameter_logging.rb

@@ -43,6 +43,10 @@ def filter_parameter_logging(*filter_words, &block)
               filtered_parameters[key] = '[FILTERED]'
             elsif value.is_a?(Hash)
               filtered_parameters[key] = filter_parameters(value)
+            elsif value.is_a?(Array)
+              filtered_parameters[key] = value.collect do |item|
+                filter_parameters(item)
+              end
             elsif block_given?
               key = key.dup
               value = value.dup if value

actionpack/test/controller/filter_params_test.rb

@@ -40,7 +40,8 @@ def test_filter_parameters
     [{'foo'=>'bar', 'bar'=>'foo'},{'foo'=>'[FILTERED]', 'bar'=>'foo'},%w'foo baz'],
     [{'foo'=>'bar', 'baz'=>'foo'},{'foo'=>'[FILTERED]', 'baz'=>'[FILTERED]'},%w'foo baz'],
     [{'bar'=>{'foo'=>'bar','bar'=>'foo'}},{'bar'=>{'foo'=>'[FILTERED]','bar'=>'foo'}},%w'fo'],
-    [{'foo'=>{'foo'=>'bar','bar'=>'foo'}},{'foo'=>'[FILTERED]'},%w'f banana']]
+    [{'foo'=>{'foo'=>'bar','bar'=>'foo'}},{'foo'=>'[FILTERED]'},%w'f banana'],
+    [{'baz'=>[{'foo'=>'baz'}]}, {'baz'=>[{'foo'=>'[FILTERED]'}]}, %w(foo)]]
 
     test_hashes.each do |before_filter, after_filter, filter_words|
       FilterParamController.filter_parameter_logging(*filter_words)