Fix Hash#to_query edge case with html_safe string on 1.8 ruby

activesupport/lib/active_support/core_ext/object/to_query.rb

@@ -7,7 +7,7 @@ class Object
   # Note: This method is defined as a default implementation for all Objects for Hash#to_query to work.
   def to_query(key)
     require 'cgi' unless defined?(CGI) && defined?(CGI::escape)
-    "#{CGI.escape(key.to_s)}=#{CGI.escape(to_param.to_s)}"
+    "#{CGI.escape(key.to_param)}=#{CGI.escape(to_param.to_s)}"
   end
 end
 

activesupport/test/core_ext/object/to_query_test.rb

@@ -1,6 +1,7 @@
 require 'abstract_unit'
 require 'active_support/ordered_hash'
 require 'active_support/core_ext/object/to_query'
+require 'active_support/core_ext/string/output_safety.rb'
 
 class ToQueryTest < Test::Unit::TestCase
   def test_simple_conversion
@@ -11,6 +12,14 @@ class ToQueryTest < Test::Unit::TestCase
     assert_query_equal 'a%3Ab=c+d', 'a:b' => 'c d'
   end
 
+  def test_html_safe_parameter_key
+    assert_query_equal 'a%3Ab=c+d', 'a:b'.html_safe => 'c d'
+  end
+
+  def test_html_safe_parameter_value
+    assert_query_equal 'a=%5B10%5D', 'a' => '[10]'.html_safe
+  end
+
   def test_nil_parameter_value
     empty = Object.new
     def empty.to_param; nil end