From c80f974fa3071104397d8dd5752ff60bca1881fe Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Tue, 14 Dec 2004 13:48:27 +0000
Subject: [PATCH] Added FormHelper#radio_button to work with radio buttons like
 its already possible with check boxes [Michael Koziarski]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@151 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 actionpack/CHANGELOG                          |  2 ++
 .../lib/action_view/helpers/form_helper.rb    | 23 +++++++++++++++++++
 actionpack/test/template/form_helper_test.rb  | 10 ++++++++
 3 files changed, 35 insertions(+)

diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index 54d451ad71..7e81100979 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Added FormHelper#radio_button to work with radio buttons like its already possible with check boxes [Michael Koziarski]
+
 * Added TemplateError#backtrace that makes it much easier to debug template errors from unit and functional tests
 
 * Added display of error messages with scaffolded form pages
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index f64965bda1..0a406cfc47 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -99,6 +99,20 @@ module ActionView
       def check_box(object, method, options = {}, checked_value = "1", unchecked_value = "0")
         InstanceTag.new(object, method, self).to_check_box_tag(options, checked_value, unchecked_value)
       end
+
+      # Returns a radio button tag for accessing a specified attribute (identified by +method+) on an object
+      # assigned to the template (identified by +object+). If the current value of +method+ is +tag_value+ the
+      # radio button will be checked. Additional options on the input tag can be passed as a
+      # hash with +options+. 
+      # Example (call, result). Imagine that @post.category returns "rails":
+      #   radio_button("post", "category", "rails")
+      #   radio_button("post", "category", "java")
+      #     <input type="radio" id="post_category" name="post[category] value="rails" checked="checked" />
+      #     <input type="radio" id="post_category" name="post[category] value="java" />
+      #     
+      def radio_button(object, method, tag_value, options = {})
+        InstanceTag.new(object, method, self).to_radio_button_tag(tag_value, options)
+      end
     end
 
     class InstanceTag #:nodoc:
@@ -123,6 +137,15 @@ module ActionView
         add_default_name_and_id(html_options)
         tag("input", html_options)
       end
+
+      def to_radio_button_tag(tag_value, options={})
+        html_options = DEFAULT_FIELD_OPTIONS.merge(options)
+        html_options.merge!({"checked"=>"checked"}) if value == tag_value
+        html_options.merge!({"type"=>"radio", "value"=>tag_value.to_s})
+                       
+        add_default_name_and_id(html_options)
+        tag("input", html_options)
+      end
       
       def to_text_area_tag(options = {})
         options = DEFAULT_TEXT_AREA_OPTIONS.merge(options)
diff --git a/actionpack/test/template/form_helper_test.rb b/actionpack/test/template/form_helper_test.rb
index 8f3d5ebb94..d81e2ac270 100644
--- a/actionpack/test/template/form_helper_test.rb
+++ b/actionpack/test/template/form_helper_test.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require 'erb'
 require File.dirname(__FILE__) + '/../../lib/action_view/helpers/form_helper'
 
 class FormHelperTest < Test::Unit::TestCase
@@ -70,6 +71,15 @@ class FormHelperTest < Test::Unit::TestCase
       check_box("post", "secret")
     )
   end
+
+  def test_radio_button
+    assert_equal('<input checked="checked" id="post_title" name="post[title]" size="30" type="radio" value="Hello World" />',
+      radio_button("post", "title", "Hello World") 
+    )
+    assert_equal('<input id="post_title" name="post[title]" size="30" type="radio" value="Goodbye World" />',
+      radio_button("post", "title", "Goodbye World") 
+    )
+  end
   
   def test_text_area
     assert_equal(