Extract input_checked? to a module

actionpack/lib/action_view/helpers/tags/base.rb

@@ -48,15 +48,6 @@ def retrieve_object(object)
           nil
         end
 
-        def input_checked?(object, options)
-          if options.has_key?("checked")
-            checked = options.delete "checked"
-            checked == true || checked == "checked"
-          else
-            checked?(value(object))
-          end
-        end
-
         def retrieve_autoindex(pre_match)
           object = self.object || @template_object.instance_variable_get("@#{pre_match}")
           if object && object.respond_to?(:to_param)

actionpack/lib/action_view/helpers/tags/check_box.rb

@@ -1,7 +1,11 @@
+require 'action_view/helpers/tags/checkable'
+
 module ActionView
   module Helpers
     module Tags
       class CheckBox < Base #:nodoc:
+        include Checkable
+
         def initialize(object_name, method_name, template_object, checked_value, unchecked_value, options)
           @checked_value   = checked_value
           @unchecked_value = unchecked_value

actionpack/lib/action_view/helpers/tags/checkable.rb

@@ -0,0 +1,16 @@
+module ActionView
+  module Helpers
+    module Tags
+      module Checkable
+        def input_checked?(object, options)
+          if options.has_key?("checked")
+            checked = options.delete "checked"
+            checked == true || checked == "checked"
+          else
+            checked?(value(object))
+          end
+        end
+      end
+    end
+  end
+end

actionpack/lib/action_view/helpers/tags/radio_button.rb

@@ -1,7 +1,11 @@
+require 'action_view/helpers/tags/checkable'
+
 module ActionView
   module Helpers
     module Tags
       class RadioButton < Base #:nodoc:
+        include Checkable
+
         def initialize(object_name, method_name, template_object, tag_value, options)
           @tag_value = tag_value
           super(object_name, method_name, template_object, options)