Lazy-require CGI for Object#to_query

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

@@ -1,5 +1,3 @@
-require 'cgi'
-
 class Object
   # Alias of <tt>to_s</tt>.
   def to_param
@@ -11,6 +9,7 @@ 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)}"
   end
 end