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

@@ -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

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:
@@ -124,6 +138,15 @@ module ActionView
         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)
         add_default_name_and_id(options)

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
@@ -71,6 +72,15 @@ class FormHelperTest < Test::Unit::TestCase
     )
   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(
       '<textarea cols="40" id="post_body" name="post[body]" rows="20" wrap="virtual">Back to the hill and over it again!</textarea>',