Extract CheckBox

actionpack/lib/action_view/helpers/form_helper.rb

@@ -828,7 +828,7 @@ def text_area(object_name, method, options = {})
       #   #    <input type="checkbox" class="eula_check" id="eula_accepted" name="eula[accepted]" value="yes" />
       #
       def check_box(object_name, method, options = {}, checked_value = "1", unchecked_value = "0")
-        InstanceTag.new(object_name, method, self, options.delete(:object)).to_check_box_tag(options, checked_value, unchecked_value)
+        ActionView::Helpers::Tags::CheckBox.new(object_name, method, self, checked_value, unchecked_value, options).render
       end
 
       # Returns a radio button tag for accessing a specified attribute (identified by +method+) on an object
@@ -1009,28 +1009,6 @@ def to_radio_button_tag(tag_value, options = {})
         tag("input", options)
       end
 
-      def to_check_box_tag(options = {}, checked_value = "1", unchecked_value = "0")
-        options = options.stringify_keys
-        options["type"]     = "checkbox"
-        options["value"]    = checked_value
-        if options.has_key?("checked")
-          cv = options.delete "checked"
-          checked = cv == true || cv == "checked"
-        else
-          checked = self.class.check_box_checked?(value(object), checked_value)
-        end
-        options["checked"] = "checked" if checked
-        if options["multiple"]
-          add_default_name_and_id_for_value(checked_value, options)
-          options.delete("multiple")
-        else
-          add_default_name_and_id(options)
-        end
-        hidden = unchecked_value ? tag("input", "name" => options["name"], "type" => "hidden", "value" => unchecked_value, "disabled" => options["disabled"]) : ""
-        checkbox = tag("input", options)
-        hidden + checkbox
-      end
-
       def to_boolean_select_tag(options = {})
         options = options.stringify_keys
         add_default_name_and_id(options)
@@ -1089,23 +1067,6 @@ def value_before_type_cast(object, method_name)
           end
         end
 
-        def check_box_checked?(value, checked_value)
-          case value
-          when TrueClass, FalseClass
-            value
-          when NilClass
-            false
-          when Integer
-            value != 0
-          when String
-            value == checked_value
-          when Array
-            value.include?(checked_value)
-          else
-            value.to_i != 0
-          end
-        end
-
         def radio_button_checked?(value, checked_value)
           value.to_s == checked_value.to_s
         end

actionpack/lib/action_view/helpers/tags.rb

@@ -8,6 +8,7 @@ module Tags
       autoload :HiddenField,   'action_view/helpers/tags/hidden_field'
       autoload :FileField,     'action_view/helpers/tags/file_field'
       autoload :TextArea,      'action_view/helpers/tags/text_area'
+      autoload :CheckBox,      'action_view/helpers/tags/check_box'
     end
   end
 end

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

@@ -0,0 +1,60 @@
+module ActionView
+  module Helpers
+    module Tags
+      class CheckBox < Base #:nodoc:
+        def initialize(object_name, method_name, template_object, checked_value, unchecked_value, options)
+          @checked_value   = checked_value
+          @unchecked_value = unchecked_value
+          super(object_name, method_name, template_object, options)
+        end
+
+        def render
+          options = @options.stringify_keys
+          options["type"]     = "checkbox"
+          options["value"]    = @checked_value
+
+          if options.has_key?("checked")
+            cv = options.delete "checked"
+            checked = cv == true || cv == "checked"
+          else
+            checked = check_box_checked?(value(object))
+          end
+
+          options["checked"] = "checked" if checked
+          if options["multiple"]
+            add_default_name_and_id_for_value(@checked_value, options)
+            options.delete("multiple")
+          else
+            add_default_name_and_id(options)
+          end
+          hidden = @unchecked_value ? tag("input", "name" => options["name"], "type" => "hidden", "value" => @unchecked_value, "disabled" => options["disabled"]) : ""
+          checkbox = tag("input", options)
+          hidden + checkbox
+        end
+
+        private
+
+        def value(object)
+          object.send @method_name if object
+        end
+
+        def check_box_checked?(value)
+          case value
+          when TrueClass, FalseClass
+            value
+          when NilClass
+            false
+          when Integer
+            value != 0
+          when String
+            value == @checked_value
+          when Array
+            value.include?(@checked_value)
+          else
+            value.to_i != 0
+          end
+        end
+      end
+    end
+  end
+end