Bring abstract_controller up to date with rails/master

Resolved all the conflicts since 2.3.0 -> HEAD. Following is a list
of commits that could not be applied cleanly or are obviated with the
abstract_controller refactor. They all need to be revisited to ensure
that fixes made in 2.3 do not reappear in 3.0:

2259ecf368e6a6715966f69216e3ee86bf1a82a7
AR not available
  * This will be reimplemented with ActionORM or equivalent

06182ea02e92afad579998aa80144588e8865ac3
implicitly rendering a js response should not use the default layout
[#1844 state:resolved]
  * This will be handled generically

893e9eb99504705419ad6edac14d00e71cef5f12
Improve view rendering performance in development mode and reinstate
template recompiling in production [#1909 state:resolved]
  * We will need to reimplement rails-dev-boost on top of the refactor;
    the changes here are very implementation specific and cannot be
    cleanly applied. The following commits are implicated:

      199e750d46c04970b5e7684998d09405648ecbd4
      3942cb406e1d5db0ac00e03153809cc8dc4cc4db
      f8ea9f85d4f1e3e6f3b5d895bef6b013aa4b0690
      e3b166aab37ddc2fbab030b146eb61713b91bf55
      ae9f258e03c9fd5088da12c1c6cd216cc89a01f7
      44423126c6f6133a1d9cf1d0832b527e8711d40f

0cb020b4d6d838025859bd60fb8151c8e21b8e84
workaround for picking layouts based on wrong view_paths
[#1974 state:resolved]
  * The specifics of this commit no longer apply. Since it is a two-line
    commit, we will reimplement this change.

8c5cc66a831aadb159f3daaffa4208064c30af0e
make action_controller/layouts pick templates from the current instance's
view_paths instead of the class view_paths [#1974 state:resolved]
  * This does not apply at all. It should be trivial to apply the feature
    to the reimplemented ActionController::Base.

87e8b162463f13bd50d27398f020769460a770e3
fix HTML fallback for explicit templates [#2052 state:resolved]
  * There were a number of patches related to this that simply compounded
    each other. Basically none of them apply cleanly, and the underlying
    issue needs to be revisited. After discussing the underlying problem
    with Koz, we will defer these fixes for further discussion.

13 files changed, 476 insertions, 112 deletions

diff --git a/actionpack/lib/action_view/helpers/active_record_helper.rb b/actionpack/lib/action_view/helpers/active_record_helper.rb
index 8b56d241ae..7c0dfdab10 100644
--- a/actionpack/lib/action_view/helpers/active_record_helper.rb
+++ b/actionpack/lib/action_view/helpers/active_record_helper.rb
@@ -121,7 +121,7 @@ module ActionView
         if (obj = (object.respond_to?(:errors) ? object : instance_variable_get("@#{object}"))) &&
           (errors = obj.errors.on(method))
           content_tag("div",
-            "#{options[:prepend_text]}#{errors.is_a?(Array) ? errors.first : errors}#{options[:append_text]}",
+            "#{options[:prepend_text]}#{ERB::Util.html_escape(errors.is_a?(Array) ? errors.first : errors)}#{options[:append_text]}",
             :class => options[:css_class]
           )
         else
@@ -194,11 +194,11 @@ module ActionView
               options[:header_message]
             else
               object_name = options[:object_name].to_s.gsub('_', ' ')
-              object_name = I18n.t(object_name, :default => object_name, :scope => [:activerecord, :models], :count => 1)
+              object_name = I18n.t(options[:object_name].to_s, :default => object_name, :scope => [:activerecord, :models], :count => 1)
               locale.t :header, :count => count, :model => object_name
             end
             message = options.include?(:message) ? options[:message] : locale.t(:body)
-            error_messages = objects.sum {|object| object.errors.full_messages.map {|msg| content_tag(:li, msg) } }.join
+            error_messages = objects.sum {|object| object.errors.full_messages.map {|msg| content_tag(:li, ERB::Util.html_escape(msg)) } }.join
 
             contents = ''
             contents << content_tag(options[:header_tag] || :h2, header_message) unless header_message.blank?
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helper.rb b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
index f6abea38ed..a32beb6100 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helper.rb
@@ -516,7 +516,8 @@ module ActionView
         def compute_public_path(source, dir, ext = nil, include_host = true)
           has_request = @controller.respond_to?(:request)
 
-          if ext && (File.extname(source).blank? || File.exist?(File.join(ASSETS_DIR, dir, "#{source}.#{ext}")))
+          source_ext = File.extname(source)[1..-1]
+          if ext && (source_ext.blank? || (ext != source_ext && File.exist?(File.join(ASSETS_DIR, dir, "#{source}.#{ext}"))))
             source += ".#{ext}"
           end
 
diff --git a/actionpack/lib/action_view/helpers/atom_feed_helper.rb b/actionpack/lib/action_view/helpers/atom_feed_helper.rb
index cd25684940..dc4497581c 100644
--- a/actionpack/lib/action_view/helpers/atom_feed_helper.rb
+++ b/actionpack/lib/action_view/helpers/atom_feed_helper.rb
@@ -30,7 +30,7 @@ module ActionView
       #   app/views/posts/index.atom.builder:
       #     atom_feed do |feed|
       #       feed.title("My great blog!")
-      #       feed.updated((@posts.first.created_at))
+      #       feed.updated(@posts.first.created_at)
       #
       #       for post in @posts
       #         feed.entry(post) do |entry|
diff --git a/actionpack/lib/action_view/helpers/capture_helper.rb b/actionpack/lib/action_view/helpers/capture_helper.rb
index e86ca27f31..9e39536653 100644
--- a/actionpack/lib/action_view/helpers/capture_helper.rb
+++ b/actionpack/lib/action_view/helpers/capture_helper.rb
@@ -131,6 +131,14 @@ module ActionView
       ensure
         self.output_buffer = old_buffer
       end
+
+      # Add the output buffer to the response body and start a new one.
+      def flush_output_buffer #:nodoc:
+        if output_buffer && output_buffer != ''
+          response.body_parts << output_buffer
+          self.output_buffer = ''
+        end
+      end
     end
   end
 end
diff --git a/actionpack/lib/action_view/helpers/date_helper.rb b/actionpack/lib/action_view/helpers/date_helper.rb
index b4c1adbe76..c74909a360 100644
--- a/actionpack/lib/action_view/helpers/date_helper.rb
+++ b/actionpack/lib/action_view/helpers/date_helper.rb
@@ -876,8 +876,8 @@ module ActionView
           input_name_from_type(type).gsub(/([\[\(])|(\]\[)/, '_').gsub(/[\]\)]/, '')
         end
 
-        # Given an ordering of datetime components, create the selection html
-        # and join them with their appropriate seperators
+        # Given an ordering of datetime components, create the selection HTML
+        # and join them with their appropriate separators.
         def build_selects_from_types(order)
           select = ''
           order.reverse.each do |type|
@@ -931,7 +931,7 @@ module ActionView
         end
 
         def default_datetime(options)
-          return if options[:include_blank]
+          return if options[:include_blank] || options[:prompt]
 
           case options[:default]
             when nil
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index a85751c657..a59829b23f 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -5,17 +5,24 @@ require 'action_view/helpers/form_tag_helper'
 
 module ActionView
   module Helpers
-    # Form helpers are designed to make working with models much easier compared to using just standard HTML
-    # elements by providing a set of methods for creating forms based on your models. This helper generates the HTML
-    # for forms, providing a method for each sort of input (e.g., text, password, select, and so on). When the form
-    # is submitted (i.e., when the user hits the submit button or <tt>form.submit</tt> is called via JavaScript), the form inputs will be bundled into the <tt>params</tt> object and passed back to the controller.
+    # Form helpers are designed to make working with models much easier
+    # compared to using just standard HTML elements by providing a set of
+    # methods for creating forms based on your models. This helper generates
+    # the HTML for forms, providing a method for each sort of input
+    # (e.g., text, password, select, and so on). When the form is submitted
+    # (i.e., when the user hits the submit button or <tt>form.submit</tt> is
+    # called via JavaScript), the form inputs will be bundled into the
+    # <tt>params</tt> object and passed back to the controller.
     #
-    # There are two types of form helpers: those that specifically work with model attributes and those that don't.
-    # This helper deals with those that work with model attributes; to see an example of form helpers that don't work
-    # with model attributes, check the ActionView::Helpers::FormTagHelper documentation.
+    # There are two types of form helpers: those that specifically work with
+    # model attributes and those that don't. This helper deals with those that
+    # work with model attributes; to see an example of form helpers that don't
+    # work with model attributes, check the ActionView::Helpers::FormTagHelper
+    # documentation.
     #
-    # The core method of this helper, form_for, gives you the ability to create a form for a model instance;
-    # for example, let's say that you have a model <tt>Person</tt> and want to create a new instance of it:
+    # The core method of this helper, form_for, gives you the ability to create
+    # a form for a model instance; for example, let's say that you have a model
+    # <tt>Person</tt> and want to create a new instance of it:
     #
     #     # Note: a @person variable will have been created in the controller.
     #     # For example: @person = Person.new
@@ -40,17 +47,22 @@ module ActionView
     #       <%= submit_tag 'Create' %>
     #     <% end %>
     #
-    # This example will render the <tt>people/_form</tt> partial, setting a local variable called <tt>form</tt> which references the yielded FormBuilder.
-    #
-    # The <tt>params</tt> object created when this form is submitted would look like:
+    # This example will render the <tt>people/_form</tt> partial, setting a
+    # local variable called <tt>form</tt> which references the yielded
+    # FormBuilder. The <tt>params</tt> object created when this form is
+    # submitted would look like:
     #
     #     {"action"=>"create", "controller"=>"persons", "person"=>{"first_name"=>"William", "last_name"=>"Smith"}}
     #
-    # The params hash has a nested <tt>person</tt> value, which can therefore be accessed with <tt>params[:person]</tt> in the controller.
-    # If were editing/updating an instance (e.g., <tt>Person.find(1)</tt> rather than <tt>Person.new</tt> in the controller), the objects
-    # attribute values are filled into the form (e.g., the <tt>person_first_name</tt> field would have that person's first name in it).
+    # The params hash has a nested <tt>person</tt> value, which can therefore
+    # be accessed with <tt>params[:person]</tt> in the controller. If were
+    # editing/updating an instance (e.g., <tt>Person.find(1)</tt> rather than
+    # <tt>Person.new</tt> in the controller), the objects attribute values are
+    # filled into the form (e.g., the <tt>person_first_name</tt> field would
+    # have that person's first name in it).
     #
-    # If the object name contains square brackets the id for the object will be inserted. For example:
+    # If the object name contains square brackets the id for the object will be
+    # inserted. For example:
     #
     #   <%= text_field "person[]", "name" %>
     #
@@ -58,8 +70,10 @@ module ActionView
     #
     #   <input type="text" id="person_<%= @person.id %>_name" name="person[<%= @person.id %>][name]" value="<%= @person.name %>" />
     #
-    # If the helper is being used to generate a repetitive sequence of similar form elements, for example in a partial
-    # used by <tt>render_collection_of_partials</tt>, the <tt>index</tt> option may come in handy. Example:
+    # If the helper is being used to generate a repetitive sequence of similar
+    # form elements, for example in a partial used by
+    # <tt>render_collection_of_partials</tt>, the <tt>index</tt> option may
+    # come in handy. Example:
     #
     #   <%= text_field "person", "name", "index" => 1 %>
     #
@@ -67,14 +81,17 @@ module ActionView
     #
     #   <input type="text" id="person_1_name" name="person[1][name]" value="<%= @person.name %>" />
     #
-    # An <tt>index</tt> option may also be passed to <tt>form_for</tt> and <tt>fields_for</tt>.  This automatically applies
-    # the <tt>index</tt> to all the nested fields.
+    # An <tt>index</tt> option may also be passed to <tt>form_for</tt> and
+    # <tt>fields_for</tt>.  This automatically applies the <tt>index</tt> to
+    # all the nested fields.
     #
-    # There are also methods for helping to build form tags in link:classes/ActionView/Helpers/FormOptionsHelper.html,
-    # link:classes/ActionView/Helpers/DateHelper.html, and link:classes/ActionView/Helpers/ActiveRecordHelper.html
+    # There are also methods for helping to build form tags in
+    # link:classes/ActionView/Helpers/FormOptionsHelper.html,
+    # link:classes/ActionView/Helpers/DateHelper.html, and
+    # link:classes/ActionView/Helpers/ActiveRecordHelper.html
     module FormHelper
-      # Creates a form and a scope around a specific model object that is used as
-      # a base for questioning about values for the fields.
+      # Creates a form and a scope around a specific model object that is used
+      # as a base for questioning about values for the fields.
       #
       # Rails provides succinct resource-oriented form generation with +form_for+
       # like this:
@@ -86,13 +103,15 @@ module ActionView
       #     <%= f.text_field :author %><br />
       #   <% end %>
       #
-      # There, +form_for+ is able to generate the rest of RESTful form parameters
-      # based on introspection on the record, but to understand what it does we
-      # need to dig first into the alternative generic usage it is based upon.
+      # There, +form_for+ is able to generate the rest of RESTful form
+      # parameters based on introspection on the record, but to understand what
+      # it does we need to dig first into the alternative generic usage it is
+      # based upon.
       #
       # === Generic form_for
       #
-      # The generic way to call +form_for+ yields a form builder around a model:
+      # The generic way to call +form_for+ yields a form builder around a
+      # model:
       #
       #   <% form_for :person, :url => { :action => "update" } do |f| %>
       #     <%= f.error_messages %>
@@ -103,8 +122,8 @@ module ActionView
       #   <% end %>
       #
       # There, the first argument is a symbol or string with the name of the
-      # object the form is about, and also the name of the instance variable the
-      # object is stored in.
+      # object the form is about, and also the name of the instance variable
+      # the object is stored in.
       #
       # The form builder acts as a regular form helper that somehow carries the
       # model. Thus, the idea is that
@@ -137,17 +156,18 @@ module ActionView
       # In any of its variants, the rightmost argument to +form_for+ is an
       # optional hash of options:
       #
-      # * <tt>:url</tt> - The URL the form is submitted to. It takes the same fields
-      #   you pass to +url_for+ or +link_to+. In particular you may pass here a
-      #   named route directly as well. Defaults to the current action.
+      # * <tt>:url</tt> - The URL the form is submitted to. It takes the same
+      #   fields you pass to +url_for+ or +link_to+. In particular you may pass
+      #   here a named route directly as well. Defaults to the current action.
       # * <tt>:html</tt> - Optional HTML attributes for the form tag.
       #
-      # Worth noting is that the +form_for+ tag is called in a ERb evaluation block,
-      # not an ERb output block. So that's <tt><% %></tt>, not <tt><%= %></tt>.
+      # Worth noting is that the +form_for+ tag is called in a ERb evaluation
+      # block, not an ERb output block. So that's <tt><% %></tt>, not
+      # <tt><%= %></tt>.
       #
       # Also note that +form_for+ doesn't create an exclusive scope. It's still
-      # possible to use both the stand-alone FormHelper methods and methods from
-      # FormTagHelper. For example:
+      # possible to use both the stand-alone FormHelper methods and methods
+      # from FormTagHelper. For example:
       #
       #   <% form_for :person, @person, :url => { :action => "update" } do |f| %>
       #     First name: <%= f.text_field :first_name %>
@@ -156,16 +176,16 @@ module ActionView
       #     Admin?    : <%= check_box_tag "person[admin]", @person.company.admin? %>
       #   <% end %>
       #
-      # This also works for the methods in FormOptionHelper and DateHelper that are
-      # designed to work with an object as base, like FormOptionHelper#collection_select
-      # and DateHelper#datetime_select.
+      # This also works for the methods in FormOptionHelper and DateHelper that
+      # are designed to work with an object as base, like
+      # FormOptionHelper#collection_select and DateHelper#datetime_select.
       #
       # === Resource-oriented style
       #
-      # As we said above, in addition to manually configuring the +form_for+ call,
-      # you can rely on automated resource identification, which will use the conventions
-      # and named routes of that approach. This is the preferred way to use +form_for+
-      # nowadays.
+      # As we said above, in addition to manually configuring the +form_for+
+      # call, you can rely on automated resource identification, which will use
+      # the conventions and named routes of that approach. This is the
+      # preferred way to use +form_for+ nowadays.
       #
       # For example, if <tt>@post</tt> is an existing record you want to edit
       #
@@ -205,8 +225,10 @@ module ActionView
       #
       # === Customized form builders
       #
-      # You can also build forms using a customized FormBuilder class. Subclass FormBuilder and override or define some more helpers,
-      # then use your custom builder. For example, let's say you made a helper to automatically add labels to form inputs.
+      # You can also build forms using a customized FormBuilder class. Subclass
+      # FormBuilder and override or define some more helpers, then use your
+      # custom builder. For example, let's say you made a helper to
+      # automatically add labels to form inputs.
       #
       #   <% form_for :person, @person, :url => { :action => "update" }, :builder => LabellingFormBuilder do |f| %>
       #     <%= f.text_field :first_name %>
@@ -219,16 +241,23 @@ module ActionView
       #
       #   <%= render :partial => f %>
       #
-      # The rendered template is <tt>people/_labelling_form</tt> and the local variable referencing the form builder is called <tt>labelling_form</tt>.
+      # The rendered template is <tt>people/_labelling_form</tt> and the local
+      # variable referencing the form builder is called
+      # <tt>labelling_form</tt>.
+      #
+      # The custom FormBuilder class is automatically merged with the options
+      # of a nested fields_for call, unless it's explicitely set.
       #
-      # In many cases you will want to wrap the above in another helper, so you could do something like the following:
+      # In many cases you will want to wrap the above in another helper, so you
+      # could do something like the following:
       #
       #   def labelled_form_for(record_or_name_or_array, *args, &proc)
       #     options = args.extract_options!
       #     form_for(record_or_name_or_array, *(args << options.merge(:builder => LabellingFormBuilder)), &proc)
       #   end
       #
-      # If you don't need to attach a form to a model instance, then check out FormTagHelper#form_tag.
+      # If you don't need to attach a form to a model instance, then check out
+      # FormTagHelper#form_tag.
       def form_for(record_or_name_or_array, *args, &proc)
         raise ArgumentError, "Missing block" unless block_given?
 
@@ -269,10 +298,12 @@ module ActionView
         options[:url] ||= polymorphic_path(object_or_array)
       end
 
-      # Creates a scope around a specific model object like form_for, but doesn't create the form tags themselves. This makes
-      # fields_for suitable for specifying additional model objects in the same form:
+      # Creates a scope around a specific model object like form_for, but
+      # doesn't create the form tags themselves. This makes fields_for suitable
+      # for specifying additional model objects in the same form.
+      #
+      # === Generic Examples
       #
-      # ==== Examples
       #   <% form_for @person, :url => { :action => "update" } do |person_form| %>
       #     First name: <%= person_form.text_field :first_name %>
       #     Last name : <%= person_form.text_field :last_name %>
@@ -282,20 +313,166 @@ module ActionView
       #     <% end %>
       #   <% end %>
       #
-      # ...or if you have an object that needs to be represented as a different parameter, like a Client that acts as a Person:
+      # ...or if you have an object that needs to be represented as a different
+      # parameter, like a Client that acts as a Person:
       #
       #   <% fields_for :person, @client do |permission_fields| %>
       #     Admin?: <%= permission_fields.check_box :admin %>
       #   <% end %>
       #
-      # ...or if you don't have an object, just a name of the parameter
+      # ...or if you don't have an object, just a name of the parameter:
       #
       #   <% fields_for :person do |permission_fields| %>
       #     Admin?: <%= permission_fields.check_box :admin %>
       #   <% end %>
       #
-      # Note: This also works for the methods in FormOptionHelper and DateHelper that are designed to work with an object as base,
-      # like FormOptionHelper#collection_select and DateHelper#datetime_select.
+      # Note: This also works for the methods in FormOptionHelper and
+      # DateHelper that are designed to work with an object as base, like
+      # FormOptionHelper#collection_select and DateHelper#datetime_select.
+      #
+      # === Nested Attributes Examples
+      #
+      # When the object belonging to the current scope has a nested attribute
+      # writer for a certain attribute, fields_for will yield a new scope
+      # for that attribute. This allows you to create forms that set or change
+      # the attributes of a parent object and its associations in one go.
+      #
+      # Nested attribute writers are normal setter methods named after an
+      # association. The most common way of defining these writers is either
+      # with +accepts_nested_attributes_for+ in a model definition or by
+      # defining a method with the proper name. For example: the attribute
+      # writer for the association <tt>:address</tt> is called
+      # <tt>address_attributes=</tt>.
+      #
+      # Whether a one-to-one or one-to-many style form builder will be yielded
+      # depends on whether the normal reader method returns a _single_ object
+      # or an _array_ of objects.
+      #
+      # ==== One-to-one
+      #
+      # Consider a Person class which returns a _single_ Address from the
+      # <tt>address</tt> reader method and responds to the
+      # <tt>address_attributes=</tt> writer method:
+      #
+      #   class Person
+      #     def address
+      #       @address
+      #     end
+      #
+      #     def address_attributes=(attributes)
+      #       # Process the attributes hash
+      #     end
+      #   end
+      #
+      # This model can now be used with a nested fields_for, like so:
+      #
+      #   <% form_for @person, :url => { :action => "update" } do |person_form| %>
+      #     ...
+      #     <% person_form.fields_for :address do |address_fields| %>
+      #       Street  : <%= address_fields.text_field :street %>
+      #       Zip code: <%= address_fields.text_field :zip_code %>
+      #     <% end %>
+      #   <% end %>
+      #
+      # When address is already an association on a Person you can use
+      # +accepts_nested_attributes_for+ to define the writer method for you:
+      #
+      #   class Person < ActiveRecord::Base
+      #     has_one :address
+      #     accepts_nested_attributes_for :address
+      #   end
+      #
+      # If you want to destroy the associated model through the form, you have
+      # to enable it first using the <tt>:allow_destroy</tt> option for
+      # +accepts_nested_attributes_for+:
+      #
+      #   class Person < ActiveRecord::Base
+      #     has_one :address
+      #     accepts_nested_attributes_for :address, :allow_destroy => true
+      #   end
+      #
+      # Now, when you use a form element with the <tt>_delete</tt> parameter,
+      # with a value that evaluates to +true+, you will destroy the associated
+      # model (eg. 1, '1', true, or 'true'):
+      #
+      #   <% form_for @person, :url => { :action => "update" } do |person_form| %>
+      #     ...
+      #     <% person_form.fields_for :address do |address_fields| %>
+      #       ...
+      #       Delete: <%= address_fields.check_box :_delete %>
+      #     <% end %>
+      #   <% end %>
+      #
+      # ==== One-to-many
+      #
+      # Consider a Person class which returns an _array_ of Project instances
+      # from the <tt>projects</tt> reader method and responds to the
+      # <tt>projects_attributes=</tt> writer method:
+      #
+      #   class Person
+      #     def projects
+      #       [@project1, @project2]
+      #     end
+      #
+      #     def projects_attributes=(attributes)
+      #       # Process the attributes hash
+      #     end
+      #   end
+      #
+      # This model can now be used with a nested fields_for. The block given to
+      # the nested fields_for call will be repeated for each instance in the
+      # collection:
+      #
+      #   <% form_for @person, :url => { :action => "update" } do |person_form| %>
+      #     ...
+      #     <% person_form.fields_for :projects do |project_fields| %>
+      #       <% if project_fields.object.active? %>
+      #         Name: <%= project_fields.text_field :name %>
+      #       <% end %>
+      #     <% end %>
+      #   <% end %>
+      #
+      # It's also possible to specify the instance to be used:
+      #
+      #   <% form_for @person, :url => { :action => "update" } do |person_form| %>
+      #     ...
+      #     <% @person.projects.each do |project| %>
+      #       <% if project.active? %>
+      #         <% person_form.fields_for :projects, project do |project_fields| %>
+      #           Name: <%= project_fields.text_field :name %>
+      #         <% end %>
+      #       <% end %>
+      #     <% end %>
+      #   <% end %>
+      #
+      # When projects is already an association on Person you can use
+      # +accepts_nested_attributes_for+ to define the writer method for you:
+      #
+      #   class Person < ActiveRecord::Base
+      #     has_many :projects
+      #     accepts_nested_attributes_for :projects
+      #   end
+      #
+      # If you want to destroy any of the associated models through the
+      # form, you have to enable it first using the <tt>:allow_destroy</tt>
+      # option for +accepts_nested_attributes_for+:
+      #
+      #   class Person < ActiveRecord::Base
+      #     has_many :projects
+      #     accepts_nested_attributes_for :projects, :allow_destroy => true
+      #   end
+      #
+      # This will allow you to specify which models to destroy in the
+      # attributes hash by adding a form element for the <tt>_delete</tt>
+      # parameter with a value that evaluates to +true+
+      # (eg. 1, '1', true, or 'true'):
+      #
+      #   <% form_for @person, :url => { :action => "update" } do |person_form| %>
+      #     ...
+      #     <% person_form.fields_for :projects do |project_fields| %>
+      #       Delete: <%= project_fields.check_box :_delete %>
+      #     <% end %>
+      #   <% end %>
       def fields_for(record_or_name_or_array, *args, &block)
         raise ArgumentError, "Missing block" unless block_given?
         options = args.extract_options!
@@ -451,7 +628,7 @@ module ActionView
       #
       # The HTML specification says unchecked check boxes are not successful, and
       # thus web browsers do not send them. Unfortunately this introduces a gotcha:
-      # if an Invoice model has a +paid+ flag, and in the form that edits a paid
+      # if an +Invoice+ model has a +paid+ flag, and in the form that edits a paid
       # invoice the user unchecks its check box, no +paid+ parameter is sent. So,
       # any mass-assignment idiom like
       #
@@ -459,12 +636,15 @@ module ActionView
       #
       # wouldn't update the flag.
       #
-      # To prevent this the helper generates a hidden field with the same name as
-      # the checkbox after the very check box. So, the client either sends only the
-      # hidden field (representing the check box is unchecked), or both fields.
-      # Since the HTML specification says key/value pairs have to be sent in the
-      # same order they appear in the form and Rails parameters extraction always
-      # gets the first occurrence of any given key, that works in ordinary forms.
+      # To prevent this the helper generates an auxiliary hidden field before
+      # the very check box. The hidden field has the same name and its
+      # attributes mimick an unchecked check box.
+      #
+      # This way, the client either sends only the hidden field (representing
+      # the check box is unchecked), or both fields. Since the HTML specification
+      # says key/value pairs have to be sent in the same order they appear in the
+      # form, and parameters extraction gets the last occurrence of any repeated
+      # key in the query string, that works for ordinary forms.
       #
       # Unfortunately that workaround does not work when the check box goes
       # within an array-like parameter, as in
@@ -475,22 +655,26 @@ module ActionView
       #   <% end %>
       #
       # because parameter name repetition is precisely what Rails seeks to distinguish
-      # the elements of the array.
+      # the elements of the array. For each item with a checked check box you
+      # get an extra ghost item with only that attribute, assigned to "0".
+      #
+      # In that case it is preferable to either use +check_box_tag+ or to use
+      # hashes instead of arrays.
       #
       # ==== Examples
       #   # Let's say that @post.validated? is 1:
       #   check_box("post", "validated")
-      #   # => <input type="checkbox" id="post_validated" name="post[validated]" value="1" />
-      #   #    <input name="post[validated]" type="hidden" value="0" />
+      #   # => <input name="post[validated]" type="hidden" value="0" />
+      #   #    <input type="checkbox" id="post_validated" name="post[validated]" value="1" />
       #
       #   # Let's say that @puppy.gooddog is "no":
       #   check_box("puppy", "gooddog", {}, "yes", "no")
-      #   # => <input type="checkbox" id="puppy_gooddog" name="puppy[gooddog]" value="yes" />
-      #   #    <input name="puppy[gooddog]" type="hidden" value="no" />
+      #   # => <input name="puppy[gooddog]" type="hidden" value="no" />
+      #   #    <input type="checkbox" id="puppy_gooddog" name="puppy[gooddog]" value="yes" />
       #
       #   check_box("eula", "accepted", { :class => 'eula_check' }, "yes", "no")
-      #   # => <input type="checkbox" class="eula_check" id="eula_accepted" name="eula[accepted]" value="yes" />
-      #   #    <input name="eula[accepted]" type="hidden" value="no" />
+      #   # => <input name="eula[accepted]" type="hidden" value="no" />
+      #   #    <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)
@@ -498,8 +682,10 @@ module ActionView
 
       # 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+.
+      # radio button will be checked.
+      #
+      # To force the radio button to be checked pass <tt>:checked => true</tt> in the
+      # +options+ hash. You may pass HTML options there as well.
       #
       # ==== Examples
       #   # Let's say that @post.category returns "rails":
@@ -605,7 +791,9 @@ module ActionView
         end
         options["checked"] = "checked" if checked
         add_default_name_and_id(options)
-        tag("input", options) << tag("input", "name" => options["name"], "type" => "hidden", "value" => options['disabled'] && checked ? checked_value : unchecked_value)
+        hidden = tag("input", "name" => options["name"], "type" => "hidden", "value" => options['disabled'] && checked ? checked_value : unchecked_value)
+        checkbox = tag("input", options)
+        hidden + checkbox
       end
 
       def to_boolean_select_tag(options = {})
@@ -758,9 +946,18 @@ module ActionView
           index = ""
         end
 
+        if options[:builder]
+          args << {} unless args.last.is_a?(Hash)
+          args.last[:builder] ||= options[:builder]
+        end
+
         case record_or_name_or_array
         when String, Symbol
-          name = "#{object_name}#{index}[#{record_or_name_or_array}]"
+          if nested_attributes_association?(record_or_name_or_array)
+            return fields_for_with_nested_attributes(record_or_name_or_array, args, block)
+          else
+            name = "#{object_name}#{index}[#{record_or_name_or_array}]"
+          end
         when Array
           object = record_or_name_or_array.last
           name = "#{object_name}#{index}[#{ActionController::RecordIdentifier.singular_class_name(object)}]"
@@ -802,6 +999,43 @@ module ActionView
         def objectify_options(options)
           @default_options.merge(options.merge(:object => @object))
         end
+
+        def nested_attributes_association?(association_name)
+          @object.respond_to?("#{association_name}_attributes=")
+        end
+
+        def fields_for_with_nested_attributes(association_name, args, block)
+          name = "#{object_name}[#{association_name}_attributes]"
+          association = @object.send(association_name)
+          explicit_object = args.first if args.first.respond_to?(:new_record?)
+
+          if association.is_a?(Array)
+            children = explicit_object ? [explicit_object] : association
+            explicit_child_index = args.last[:child_index] if args.last.is_a?(Hash)
+
+            children.map do |child|
+              fields_for_nested_model("#{name}[#{explicit_child_index || nested_child_index}]", child, args, block)
+            end.join
+          else
+            fields_for_nested_model(name, explicit_object || association, args, block)
+          end
+        end
+
+        def fields_for_nested_model(name, object, args, block)
+          if object.new_record?
+            @template.fields_for(name, object, *args, &block)
+          else
+            @template.fields_for(name, object, *args) do |builder|
+              @template.concat builder.hidden_field(:id)
+              block.call(builder)
+            end
+          end
+        end
+
+        def nested_child_index
+          @nested_child_index ||= -1
+          @nested_child_index += 1
+        end
     end
   end
 
@@ -809,4 +1043,4 @@ module ActionView
     cattr_accessor :default_form_builder
     self.default_form_builder = ::ActionView::Helpers::FormBuilder
   end
-end
+end
\ No newline at end of file
diff --git a/actionpack/lib/action_view/helpers/form_options_helper.rb b/actionpack/lib/action_view/helpers/form_options_helper.rb
index 54c82cbd1d..6b385ef77d 100644
--- a/actionpack/lib/action_view/helpers/form_options_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_options_helper.rb
@@ -6,9 +6,7 @@ module ActionView
   module Helpers
     # Provides a number of methods for turning different kinds of containers into a set of option tags.
     # == Options
-    # The <tt>collection_select</tt>, <tt>country_select</tt>, <tt>select</tt>,
-    # and <tt>time_zone_select</tt> methods take an <tt>options</tt> parameter,
-    # a hash.
+    # The <tt>collection_select</tt>, <tt>select</tt> and <tt>time_zone_select</tt> methods take an <tt>options</tt> parameter, a hash:
     #
     # * <tt>:include_blank</tt> - set to true or a prompt string if the first option element of the select element is a blank. Useful if there is not a default value required for the select element.
     #
@@ -28,7 +26,7 @@ module ActionView
     #
     # Example with @post.person_id => 2:
     #
-    #   select("post", "person_id", Person.find(:all).collect {|p| [ p.name, p.id ] }, {:include_blank => 'None'})
+    #   select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, {:include_blank => 'None'})
     #
     # could become:
     #
@@ -43,7 +41,7 @@ module ActionView
     #
     # Example:
     #
-    #   select("post", "person_id", Person.find(:all).collect {|p| [ p.name, p.id ] }, {:prompt => 'Select Person'})
+    #   select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, {:prompt => 'Select Person'})
     #
     # could become:
     #
@@ -68,6 +66,36 @@ module ActionView
     #     <option value="rock">rock</option>
     #     <option value="country">country</option>
     #   </select>
+    #
+    # * <tt>:disabled</tt> - can be a single value or an array of values that will be disabled options in the final output.
+    #
+    # Example:
+    #
+    #   select("post", "category", Post::CATEGORIES, {:disabled => 'restricted'})
+    #
+    # could become:
+    #
+    #   <select name="post[category]">
+    #     <option></option>
+    #     <option>joke</option>
+    #     <option>poem</option>
+    #     <option disabled="disabled">restricted</option>
+    #   </select>
+    #
+    # When used with the <tt>collection_select</tt> helper, <tt>:disabled</tt> can also be a Proc that identifies those options that should be disabled.
+    #
+    # Example:
+    #
+    #   collection_select(:post, :category_id, Category.all, :id, :name, {:disabled => lambda{|category| category.archived? }})
+    #
+    # If the categories "2008 stuff" and "Christmas" return true when the method <tt>archived?</tt> is called, this would return:
+    #   <select name="post[category_id]">
+    #     <option value="1" disabled="disabled">2008 stuff</option>
+    #     <option value="2" disabled="disabled">Christmas</option>
+    #     <option value="3">Jokes</option>
+    #     <option value="4">Poems</option>
+    #   </select>
+    #
     module FormOptionsHelper
       include ERB::Util
 
@@ -76,7 +104,7 @@ module ActionView
       # See options_for_select for the required format of the choices parameter.
       #
       # Example with @post.person_id => 1:
-      #   select("post", "person_id", Person.find(:all).collect {|p| [ p.name, p.id ] }, { :include_blank => true })
+      #   select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, { :include_blank => true })
       #
       # could become:
       #
@@ -94,7 +122,8 @@ module ActionView
       # In addition, this allows a single partial to be used to generate form inputs for both edit and create forms.
       #
       # By default, <tt>post.person_id</tt> is the selected option.  Specify <tt>:selected => value</tt> to use a different selection
-      # or <tt>:selected => nil</tt> to leave all options unselected.
+      # or <tt>:selected => nil</tt> to leave all options unselected. Similarly, you can specify values to be disabled in the option
+      # tags by specifying the <tt>:disabled</tt> option. This can either be a single value or an array of values to be disabled.
       def select(object, method, choices, options = {}, html_options = {})
         InstanceTag.new(object, method, self, options.delete(:object)).to_select_tag(choices, options, html_options)
       end
@@ -120,7 +149,7 @@ module ActionView
       #   end
       #
       # Sample usage (selecting the associated Author for an instance of Post, <tt>@post</tt>):
-      #   collection_select(:post, :author_id, Author.find(:all), :id, :name_with_initial, {:prompt => true})
+      #   collection_select(:post, :author_id, Author.all, :id, :name_with_initial, {:prompt => true})
       #
       # If <tt>@post.author_id</tt> is already <tt>1</tt>, this would return:
       #   <select name="post[author_id]">
@@ -186,14 +215,29 @@ module ActionView
       #   options_for_select([ "VISA", "MasterCard", "Discover" ], ["VISA", "Discover"])
       #     <option selected="selected">VISA</option>\n<option>MasterCard</option>\n<option selected="selected">Discover</option>
       #
+      # If you wish to specify disabled option tags, set +selected+ to be a hash, with <tt>:disabled</tt> being either a value
+      # or array of values to be disabled. In this case, you can use <tt>:selected</tt> to specify selected option tags.
+      #
+      # Examples:
+      #   options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], :disabled => "Super Platinum")
+      #     <option value="Free">Free</option>\n<option value="Basic">Basic</option>\n<option value="Advanced">Advanced</option>\n<option value="Super Platinum" disabled="disabled">Super Platinum</option>
+      #
+      #   options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], :disabled => ["Advanced", "Super Platinum"])
+      #     <option value="Free">Free</option>\n<option value="Basic">Basic</option>\n<option value="Advanced" disabled="disabled">Advanced</option>\n<option value="Super Platinum" disabled="disabled">Super Platinum</option>
+      #
+      #   options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], :selected => "Free", :disabled => "Super Platinum")
+      #     <option value="Free" selected="selected">Free</option>\n<option value="Basic">Basic</option>\n<option value="Advanced">Advanced</option>\n<option value="Super Platinum" disabled="disabled">Super Platinum</option>
+      #
       # NOTE: Only the option tags are returned, you have to wrap this call in a regular HTML select tag.
       def options_for_select(container, selected = nil)
         container = container.to_a if Hash === container
+        selected, disabled = extract_selected_and_disabled(selected)
 
         options_for_select = container.inject([]) do |options, element|
           text, value = option_text_and_value(element)
           selected_attribute = ' selected="selected"' if option_value_selected?(value, selected)
-          options << %(<option value="#{html_escape(value.to_s)}"#{selected_attribute}>#{html_escape(text.to_s)}</option>)
+          disabled_attribute = ' disabled="disabled"' if disabled && option_value_selected?(value, disabled)
+          options << %(<option value="#{html_escape(value.to_s)}"#{selected_attribute}#{disabled_attribute}>#{html_escape(text.to_s)}</option>)
         end
 
         options_for_select.join("\n")
@@ -209,8 +253,15 @@ module ActionView
       # This is more often than not used inside a #select_tag like this example:
       #   select_tag 'person', options_from_collection_for_select(@people, 'id', 'name')
       #
-      # If +selected+ is specified, the element returning a match on +value_method+ will get the selected option tag.
-      # Be sure to specify the same class as the +value_method+ when specifying a selected option.
+      # If +selected+ is specified as a value or array of values, the element(s) returning a match on +value_method+
+      # will be selected option tag(s).
+      #
+      # If +selected+ is specified as a Proc, those members of the collection that return true for the anonymous
+      # function are the selected values.
+      #
+      # +selected+ can also be a hash, specifying both <tt>:selected</tt> and/or <tt>:disabled</tt> values as required.
+      #
+      # Be sure to specify the same class as the +value_method+ when specifying selected or disabled options.
       # Failure to do this will produce undesired results. Example:
       #   options_from_collection_for_select(@people, 'id', 'name', '1')
       # Will not select a person with the id of 1 because 1 (an Integer) is not the same as '1' (a string)
@@ -220,7 +271,12 @@ module ActionView
         options = collection.map do |element|
           [element.send(text_method), element.send(value_method)]
         end
-        options_for_select(options, selected)
+        selected, disabled = extract_selected_and_disabled(selected)
+        select_deselect = {}
+        select_deselect[:selected] = extract_values_from_collection(collection, value_method, selected)
+        select_deselect[:disabled] = extract_values_from_collection(collection, value_method, disabled)
+
+        options_for_select(options, select_deselect)
       end
 
       # Returns a string of <tt><option></tt> tags, like <tt>options_from_collection_for_select</tt>, but
@@ -238,7 +294,8 @@ module ActionView
       #   +collection+, returns a value to be used as the contents of its <tt><option></tt> tag.
       # * +selected_key+ - A value equal to the +value+ attribute for one of the <tt><option></tt> tags,
       #   which will have the +selected+ attribute set. Corresponds to the return value of one of the calls
-      #   to +option_key_method+. If +nil+, no selection is made.
+      #   to +option_key_method+. If +nil+, no selection is made. Can also be a hash if disabled values are
+      #   to be specified.
       #
       # Example object structure for use with this method:
       #   class Continent < ActiveRecord::Base
@@ -388,6 +445,24 @@ module ActionView
             value == selected
           end
         end
+
+        def extract_selected_and_disabled(selected)
+          if selected.is_a?(Hash)
+            [selected[:selected], selected[:disabled]]
+          else
+            [selected, nil]
+          end
+        end
+
+        def extract_values_from_collection(collection, value_method, selected)
+          if selected.is_a?(Proc)
+            collection.map do |element|
+              element.send(value_method) if selected.call(element)
+            end.compact
+          else
+            selected
+          end
+        end
     end
 
     class InstanceTag #:nodoc:
@@ -398,16 +473,18 @@ module ActionView
         add_default_name_and_id(html_options)
         value = value(object)
         selected_value = options.has_key?(:selected) ? options[:selected] : value
-        content_tag("select", add_options(options_for_select(choices, selected_value), options, selected_value), html_options)
+        disabled_value = options.has_key?(:disabled) ? options[:disabled] : nil
+        content_tag("select", add_options(options_for_select(choices, :selected => selected_value, :disabled => disabled_value), options, selected_value), html_options)
       end
 
       def to_collection_select_tag(collection, value_method, text_method, options, html_options)
         html_options = html_options.stringify_keys
         add_default_name_and_id(html_options)
         value = value(object)
+        disabled_value = options.has_key?(:disabled) ? options[:disabled] : nil
         selected_value = options.has_key?(:selected) ? options[:selected] : value
         content_tag(
-          "select", add_options(options_from_collection_for_select(collection, value_method, text_method, selected_value), options, value), html_options
+          "select", add_options(options_from_collection_for_select(collection, value_method, text_method, :selected => selected_value, :disabled => disabled_value), options, value), html_options
         )
       end
 
diff --git a/actionpack/lib/action_view/helpers/form_tag_helper.rb b/actionpack/lib/action_view/helpers/form_tag_helper.rb
index 4646bc118b..6d39a53adc 100644
--- a/actionpack/lib/action_view/helpers/form_tag_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_tag_helper.rb
@@ -360,8 +360,8 @@ module ActionView
         end
 
         if confirm = options.delete("confirm")
-          options["onclick"] ||= ''
-          options["onclick"] << "return #{confirm_javascript_function(confirm)};"
+          options["onclick"] ||= 'return true;'
+          options["onclick"] = "if (!#{confirm_javascript_function(confirm)}) return false; #{options['onclick']}"
         end
 
         tag :input, { "type" => "submit", "name" => "commit", "value" => value }.update(options.stringify_keys)
diff --git a/actionpack/lib/action_view/helpers/number_helper.rb b/actionpack/lib/action_view/helpers/number_helper.rb
index e622f97b9e..dea958deaf 100644
--- a/actionpack/lib/action_view/helpers/number_helper.rb
+++ b/actionpack/lib/action_view/helpers/number_helper.rb
@@ -15,6 +15,7 @@ module ActionView
       # * <tt>:country_code</tt>  - Sets the country code for the phone number.
       #
       # ==== Examples
+      #  number_to_phone(5551234)                                           # => 555-1234
       #  number_to_phone(1235551234)                                        # => 123-555-1234
       #  number_to_phone(1235551234, :area_code => true)                    # => (123) 555-1234
       #  number_to_phone(1235551234, :delimiter => " ")                     # => 123 555 1234
@@ -37,7 +38,8 @@ module ActionView
           str << if area_code
             number.gsub!(/([0-9]{1,3})([0-9]{3})([0-9]{4}$)/,"(\\1) \\2#{delimiter}\\3")
           else
-            number.gsub!(/([0-9]{1,3})([0-9]{3})([0-9]{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
+            number.gsub!(/([0-9]{0,3})([0-9]{3})([0-9]{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
+            number.starts_with?('-') ? number.slice!(1..-1) : number
           end
           str << " x #{extension}" unless extension.blank?
           str
@@ -138,7 +140,7 @@ module ActionView
       #  number_with_delimiter(12345678)                        # => 12,345,678
       #  number_with_delimiter(12345678.05)                     # => 12,345,678.05
       #  number_with_delimiter(12345678, :delimiter => ".")     # => 12.345.678
-      #  number_with_delimiter(12345678, :seperator => ",")     # => 12,345,678
+      #  number_with_delimiter(12345678, :separator => ",")     # => 12,345,678
       #  number_with_delimiter(98765432.98, :delimiter => " ", :separator => ",")
       #  # => 98 765 432,98
       #
diff --git a/actionpack/lib/action_view/helpers/prototype_helper.rb b/actionpack/lib/action_view/helpers/prototype_helper.rb
index 99676a9c27..6bad11e354 100644
--- a/actionpack/lib/action_view/helpers/prototype_helper.rb
+++ b/actionpack/lib/action_view/helpers/prototype_helper.rb
@@ -107,7 +107,7 @@ module ActionView
     # on the page in an Ajax response.
     module PrototypeHelper
       unless const_defined? :CALLBACKS
-        CALLBACKS    = Set.new([ :uninitialized, :loading, :loaded,
+        CALLBACKS    = Set.new([ :create, :uninitialized, :loading, :loaded,
                          :interactive, :complete, :failure, :success ] +
                          (100..599).to_a)
         AJAX_OPTIONS = Set.new([ :before, :after, :condition, :url,
diff --git a/actionpack/lib/action_view/helpers/text_helper.rb b/actionpack/lib/action_view/helpers/text_helper.rb
index b1eb6891fa..573b99b96e 100644
--- a/actionpack/lib/action_view/helpers/text_helper.rb
+++ b/actionpack/lib/action_view/helpers/text_helper.rb
@@ -107,7 +107,7 @@ module ActionView
           text
         else
           match = Array(phrases).map { |p| Regexp.escape(p) }.join('|')
-          text.gsub(/(#{match})(?!(?:[^<]*?)?(?:["'])[^<>]*>)/i, options[:highlighter])
+          text.gsub(/(#{match})(?!(?:[^<]*?)(?:["'])[^<>]*>)/i, options[:highlighter])
         end
       end
 
@@ -324,7 +324,7 @@ module ActionView
 
       # Turns all URLs and e-mail addresses into clickable links. The <tt>:link</tt> option
       # will limit what should be linked. You can add HTML attributes to the links using
-      # <tt>:href_options</tt>. Possible values for <tt>:link</tt> are <tt>:all</tt> (default),
+      # <tt>:html</tt>. Possible values for <tt>:link</tt> are <tt>:all</tt> (default),
       # <tt>:email_addresses</tt>, and <tt>:urls</tt>. If a block is given, each URL and
       # e-mail address is yielded and the result is used as the link text.
       #
@@ -341,7 +341,7 @@ module ActionView
       #   # => "Visit http://www.loudthinking.com/ or e-mail <a href=\"mailto:david@loudthinking.com\">david@loudthinking.com</a>"
       #
       #   post_body = "Welcome to my new blog at http://www.myblog.com/.  Please e-mail me at me@email.com."
-      #   auto_link(post_body, :href_options => { :target => '_blank' }) do |text|
+      #   auto_link(post_body, :html => { :target => '_blank' }) do |text|
       #     truncate(text, 15)
       #   end
       #   # => "Welcome to my new blog at <a href=\"http://www.myblog.com/\" target=\"_blank\">http://www.m...</a>.
@@ -359,7 +359,7 @@ module ActionView
       #   auto_link(post_body, :all, :target => "_blank")     # => Once upon\na time
       #   # => "Welcome to my new blog at <a href=\"http://www.myblog.com/\" target=\"_blank\">http://www.myblog.com</a>.
       #         Please e-mail me at <a href=\"mailto:me@email.com\">me@email.com</a>."
-      def auto_link(text, *args, &block)#link = :all, href_options = {}, &block)
+      def auto_link(text, *args, &block)#link = :all, html = {}, &block)
         return '' if text.blank?
 
         options = args.size == 2 ? {} : args.extract_options! # this is necessary because the old auto_link API has a Hash as its last parameter
@@ -536,8 +536,9 @@ module ActionView
           text.gsub(AUTO_LINK_RE) do
             href = $&
             punctuation = ''
-            # detect already linked URLs
-            if $` =~ /<a\s[^>]*href="$/
+            left, right = $`, $'
+            # detect already linked URLs and URLs in the middle of a tag
+            if left =~ /<[^>]+$/ && right =~ /^[^>]*>/
               # do not change string; URL is alreay linked
               href
             else
diff --git a/actionpack/lib/action_view/helpers/translation_helper.rb b/actionpack/lib/action_view/helpers/translation_helper.rb
index dc41ef5305..4aed10f640 100644
--- a/actionpack/lib/action_view/helpers/translation_helper.rb
+++ b/actionpack/lib/action_view/helpers/translation_helper.rb
@@ -3,19 +3,37 @@ require 'action_view/helpers/tag_helper'
 module ActionView
   module Helpers
     module TranslationHelper
+      # Delegates to I18n#translate but also performs two additional functions. First, it'll catch MissingTranslationData exceptions 
+      # and turn them into inline spans that contains the missing key, such that you can see in a view what is missing where.
+      #
+      # Second, it'll scope the key by the current partial if the key starts with a period. So if you call translate(".foo") from the
+      # people/index.html.erb template, you'll actually be calling I18n.translate("people.index.foo"). This makes it less repetitive
+      # to translate many keys within the same partials and gives you a simple framework for scoping them consistently. If you don't
+      # prepend the key with a period, nothing is converted.
       def translate(key, options = {})
         options[:raise] = true
-        I18n.translate(key, options)
+        I18n.translate(scope_key_by_partial(key), options)
       rescue I18n::MissingTranslationData => e
         keys = I18n.send(:normalize_translation_keys, e.locale, e.key, e.options[:scope])
         content_tag('span', keys.join(', '), :class => 'translation_missing')
       end
       alias :t :translate
 
+      # Delegates to I18n.localize with no additional functionality.
       def localize(*args)
         I18n.localize *args
       end
       alias :l :localize
+
+
+      private
+        def scope_key_by_partial(key)
+          if key.to_s.first == "."
+            template.path_without_format_and_extension.gsub(%r{/_?}, ".") + key.to_s
+          else
+            key
+          end
+        end
     end
   end
 end
\ No newline at end of file
diff --git a/actionpack/lib/action_view/helpers/url_helper.rb b/actionpack/lib/action_view/helpers/url_helper.rb
index 2e0eb8766b..36e0a78e93 100644
--- a/actionpack/lib/action_view/helpers/url_helper.rb
+++ b/actionpack/lib/action_view/helpers/url_helper.rb
@@ -507,7 +507,30 @@ module ActionView
       #   current_page?(:controller => 'shop', :action => 'checkout')
       #   # => true
       #
-      #   current_page?(:controller => 'shop', :action => 'checkout', :order => 'asc)
+      #   current_page?(:controller => 'shop', :action => 'checkout', :order => 'asc')
+      #   # => false
+      #
+      #   current_page?(:action => 'checkout')
+      #   # => true
+      #
+      #   current_page?(:controller => 'library', :action => 'checkout')
+      #   # => false
+      #
+      # Let's say we're in the <tt>/shop/checkout?order=desc&page=1</tt> action.
+      #
+      #   current_page?(:action => 'process')
+      #   # => false
+      #
+      #   current_page?(:controller => 'shop', :action => 'checkout')
+      #   # => true
+      #
+      #   current_page?(:controller => 'shop', :action => 'checkout', :order => 'desc', :page=>'1')
+      #   # => true
+      #
+      #   current_page?(:controller => 'shop', :action => 'checkout', :order => 'desc', :page=>'2')
+      #   # => false
+      #
+      #   current_page?(:controller => 'shop', :action => 'checkout', :order => 'desc')
       #   # => false
       #
       #   current_page?(:action => 'checkout')
@@ -516,7 +539,7 @@ module ActionView
       #   current_page?(:controller => 'library', :action => 'checkout')
       #   # => false
       def current_page?(options)
-        url_string = CGI.escapeHTML(url_for(options))
+        url_string = CGI.unescapeHTML(url_for(options))
         request = @controller.request
         # We ignore any extra parameters in the request_uri if the 
         # submitted url doesn't have any either.  This lets the function