Extract NumberField

actionpack/lib/action_view/helpers/form_helper.rb

@@ -912,7 +912,7 @@ def email_field(object_name, method, options = {})
       # ==== Options
       # * Accepts same options as number_field_tag
       def number_field(object_name, method, options = {})
-        InstanceTag.new(object_name, method, self, options.delete(:object)).to_number_field_tag("number", options)
+        ActionView::Helpers::Tags::NumberField.new(object_name, method, self, options).render
       end
 
       # Returns an input tag of type "range".

actionpack/lib/action_view/helpers/tags.rb

@@ -11,6 +11,7 @@ module Tags
       autoload :TelField,      'action_view/helpers/tags/tel_field'
       autoload :UrlField,      'action_view/helpers/tags/url_field'
       autoload :EmailField,    'action_view/helpers/tags/email_field'
+      autoload :NumberField,   'action_view/helpers/tags/number_field'
       autoload :TextArea,      'action_view/helpers/tags/text_area'
       autoload :CheckBox,      'action_view/helpers/tags/check_box'
       autoload :RadioButton,   'action_view/helpers/tags/radio_button'

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

@@ -0,0 +1,19 @@
+module ActionView
+  module Helpers
+    module Tags
+      class NumberField < TextField #:nodoc:
+        def render
+          options = @options.stringify_keys
+          options['size'] ||= nil
+
+          if range = options.delete("in") || options.delete("within")
+            options.update("min" => range.min, "max" => range.max)
+          end
+
+          @options = options
+          super
+        end
+      end
+    end
+  end
+end