From b0a1aa7e7e4bc1b0a714fd143cc91944e2f4d230 Mon Sep 17 00:00:00 2001
From: Jamis Buck <jamis@37signals.com>
Date: Wed, 17 Jan 2007 00:04:02 +0000
Subject: Allow fields_for to be nested in form_for

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5965 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 actionpack/CHANGELOG                              |  2 ++
 actionpack/lib/action_view/helpers/form_helper.rb | 17 +++++++++---
 actionpack/test/template/form_helper_test.rb      | 33 ++++++++++++++++++++---
 3 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index 5720d9713f..c3cfcc0ab6 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Allow fields_for to be nested inside form_for, so that the name and id get properly constructed [Jamis Buck]
+
 * Allow inGroupsOf and eachSlice to be called through rjs. #7046 [Cody Fauser]
 
 * Allow exempt_from_layout :rhtml.  #6742, #7026 [dcmanges, Squeegy]
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 8aa0b42fe1..1c0829b300 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -401,11 +401,15 @@ module ActionView
         end
 
         def tag_id
-          "#{@object_name}_#{@method_name}"
+          "#{sanitized_object_name}_#{@method_name}"
         end
 
         def tag_id_with_index(index)
-          "#{@object_name}_#{index}_#{@method_name}"
+          "#{sanitized_object_name}_#{index}_#{@method_name}"
+        end
+
+        def sanitized_object_name
+          @object_name.gsub(/[^-a-zA-Z0-9:.]/, "_").sub(/_$/, "")
         end
     end
 
@@ -420,7 +424,7 @@ module ActionView
         @object_name, @object, @template, @options, @proc = object_name, object, template, options, proc        
       end
       
-      (field_helpers - %w(check_box radio_button)).each do |selector|
+      (field_helpers - %w(check_box radio_button fields_for)).each do |selector|
         src = <<-end_src
           def #{selector}(method, options = {})
             @template.send(#{selector.inspect}, @object_name, method, options.merge(:object => @object))
@@ -428,7 +432,12 @@ module ActionView
         end_src
         class_eval src, __FILE__, __LINE__
       end
-      
+
+      def fields_for(name, *args, &block)
+        name = "#{object_name}[#{name}]"
+        @template.fields_for(name, *args, &block)
+      end
+
       def check_box(method, options = {}, checked_value = "1", unchecked_value = "0")
         @template.check_box(@object_name, method, options.merge(:object => @object), checked_value, unchecked_value)
       end
diff --git a/actionpack/test/template/form_helper_test.rb b/actionpack/test/template/form_helper_test.rb
index a7ceb6b30f..4796e3d35d 100644
--- a/actionpack/test/template/form_helper_test.rb
+++ b/actionpack/test/template/form_helper_test.rb
@@ -297,11 +297,28 @@ class FormHelperTest < Test::Unit::TestCase
     
     expected = 
       "<form action='http://www.example.com' method='post'>" +
-      "<input name='post[123][title]' size='30' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[123][body]' id='post_body' rows='20' cols='40'>Back to the hill and over it again!</textarea>" +
-      "<input name='post[123][secret]' checked='checked' type='checkbox' id='post_secret' value='1' />" +
+      "<input name='post[123][title]' size='30' type='text' id='post_123_title' value='Hello World' />" +
+      "<textarea name='post[123][body]' id='post_123_body' rows='20' cols='40'>Back to the hill and over it again!</textarea>" +
+      "<input name='post[123][secret]' checked='checked' type='checkbox' id='post_123_secret' value='1' />" +
       "<input name='post[123][secret]' type='hidden' value='0' />" +
       "</form>"
+
+    assert_dom_equal expected, _erbout
+  end
+
+  def test_nested_fields_for
+    _erbout = ''
+    form_for(:post, @post) do |f|
+      f.fields_for(:comment, @post) do |c|
+        _erbout.concat c.text_field(:title)
+      end
+    end
+
+    expected = "<form action='http://www.example.com' method='post'>" +
+               "<input name='post[comment][title]' size='30' type='text' id='post_comment_title' value='Hello World' />" +
+               "</form>"
+
+    assert_dom_equal expected, _erbout
   end
 
   def test_fields_for
@@ -339,6 +356,16 @@ class FormHelperTest < Test::Unit::TestCase
     assert_dom_equal expected, _erbout
   end
 
+  def test_fields_for_object_with_bracketed_name
+    _erbout = ''
+    fields_for("author[post]", @post) do |f|
+      _erbout.concat f.text_field(:title)
+    end
+
+    assert_dom_equal "<input name='author[post][title]' size='30' type='text' id='author_post_title' value='Hello World' />",
+      _erbout
+  end
+
   def test_form_builder_does_not_have_form_for_method
     assert ! ActionView::Helpers::FormBuilder.instance_methods.include?('form_for')
   end
-- 
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