Merge branch 'master' of git://github.com/rails/rails

19 files changed, 374 insertions, 273 deletions

diff --git a/actionpack/lib/action_controller/metal/params_wrapper.rb b/actionpack/lib/action_controller/metal/params_wrapper.rb
index 6acbb23907..e0d8e1c992 100644
--- a/actionpack/lib/action_controller/metal/params_wrapper.rb
+++ b/actionpack/lib/action_controller/metal/params_wrapper.rb
@@ -141,19 +141,16 @@ module ActionController
       # try to find Foo::Bar::User, Foo::User and finally User.
       def _default_wrap_model #:nodoc:
         return nil if self.anonymous?
-
         model_name = self.name.sub(/Controller$/, '').singularize
 
         begin
-          model_klass = model_name.constantize
-        rescue NameError, ArgumentError => e
-          if e.message =~ /is not missing constant|uninitialized constant #{model_name}/
+          if model_klass = model_name.safe_constantize
+            model_klass
+          else
             namespaces = model_name.split("::")
             namespaces.delete_at(-2)
             break if namespaces.last == model_name
             model_name = namespaces.join("::")
-          else
-            raise
           end
         end until model_klass
 
diff --git a/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb b/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
index eaefdc0f15..af06bffa16 100644
--- a/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
+++ b/actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb
@@ -1,4 +1,5 @@
 require 'set'
+require 'cgi'
 require 'active_support/core_ext/class/attribute'
 
 module HTML
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index fa2948c8db..8a9f9c4315 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -256,6 +256,10 @@ module Mime
       @@html_types.include?(to_sym) || @string =~ /html/
     end
 
+    def respond_to?(method, include_private = false) #:nodoc:
+      super || method.to_s =~ /(\w+)\?$/
+    end
+
     private
       def method_missing(method, *args)
         if method.to_s =~ /(\w+)\?$/
diff --git a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
index a765c23dae..2fa68c64c5 100644
--- a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
+++ b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
@@ -86,8 +86,8 @@ module ActionDispatch
           :framework_trace => framework_trace(exception),
           :full_trace => full_trace(exception)
         )
-        file = "rescues/#{@@rescue_templates[exception.class.name]}.erb"
-        body = template.render(:file => file, :layout => 'rescues/layout.erb')
+        file = "rescues/#{@@rescue_templates[exception.class.name]}"
+        body = template.render(:template => file, :layout => 'rescues/layout')
         render(status_code(exception), body)
       end
 
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 46a68a32ae..e921269331 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -165,13 +165,14 @@ module ActionDispatch
               remove_possible_method :#{selector}
               def #{selector}(*args)
                 options = args.extract_options!
+                result = #{options.inspect}
 
                 if args.any?
-                  options[:_positional_args] = args
-                  options[:_positional_keys] = #{route.segment_keys.inspect}
+                  result[:_positional_args] = args
+                  result[:_positional_keys] = #{route.segment_keys.inspect}
                 end
 
-                options ? #{options.inspect}.merge(options) : #{options.inspect}
+                result.merge(options)
               end
               protected :#{selector}
             END_EVAL
diff --git a/actionpack/lib/action_dispatch/testing/integration.rb b/actionpack/lib/action_dispatch/testing/integration.rb
index aae5752c93..0f1bb9f260 100644
--- a/actionpack/lib/action_dispatch/testing/integration.rb
+++ b/actionpack/lib/action_dispatch/testing/integration.rb
@@ -241,8 +241,8 @@ module ActionDispatch
         end
 
         # Performs the actual request.
-        def process(method, path, parameters = nil, env = nil)
-          env ||= {}
+        def process(method, path, parameters = nil, rack_env = nil)
+          rack_env ||= {}
           if path =~ %r{://}
             location = URI.parse(path)
             https! URI::HTTPS === location if location.scheme
@@ -258,7 +258,7 @@ module ActionDispatch
 
           hostname, port = host.split(':')
 
-          default_env = {
+          env = {
             :method => method,
             :params => parameters,
 
@@ -276,7 +276,7 @@ module ActionDispatch
 
           session = Rack::Test::Session.new(_mock_session)
 
-          env.reverse_merge!(default_env)
+          env.merge!(rack_env)
 
           # NOTE: rack-test v0.5 doesn't build a default uri correctly
           # Make sure requested path is always a full uri
diff --git a/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb b/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb
index 2eb3eb31af..343153c8c5 100644
--- a/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb
+++ b/actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb
@@ -17,7 +17,7 @@ module ActionView
 
         def asset_tag(source, options)
           # We force the :request protocol here to avoid a double-download bug in IE7 and IE8
-          tag("link", { "rel" => "stylesheet", "type" => Mime::CSS, "media" => "screen", "href" => ERB::Util.html_escape(path_to_asset(source, :protocol => :request)) }.merge(options), false, false)
+          tag("link", { "rel" => "stylesheet", "type" => Mime::CSS, "media" => "screen", "href" => path_to_asset(source, :protocol => :request) }.merge(options))
         end
 
         def custom_dir
diff --git a/actionpack/lib/action_view/helpers/url_helper.rb b/actionpack/lib/action_view/helpers/url_helper.rb
index acd5e46e33..0c2e1aa3a9 100644
--- a/actionpack/lib/action_view/helpers/url_helper.rb
+++ b/actionpack/lib/action_view/helpers/url_helper.rb
@@ -279,6 +279,7 @@ module ActionView
       #   processed normally, otherwise no action is taken.
       # * <tt>:remote</tt> -  If set to true, will allow the Unobtrusive JavaScript drivers to control the
       #   submit behavior. By default this behavior is an ajax submit.
+      # * <tt>:form</tt> - This hash will be form attributes
       # * <tt>:form_class</tt> - This controls the class of the form within which the submit button will
       #   be placed
       #
@@ -295,6 +296,12 @@ module ActionView
       #   #    </form>"
       #
       #
+      #   <%= button_to "Create", :action => "create", :remote => true, :form => { "data-type" => "json" } %>
+      #   # => "<form method="post" action="/images/create" class="button_to" data-remote="true" data-type="json">
+      #   #      <div><input value="Create" type="submit" /></div>
+      #   #    </form>"
+      #
+      #      
       #   <%= button_to "Delete Image", { :action => "delete", :id => @image.id },
       #             :confirm => "Are you sure?", :method => :delete %>
       #   # => "<form method="post" action="/images/delete/1" class="button_to">
@@ -324,10 +331,11 @@ module ActionView
         end
 
         form_method = method.to_s == 'get' ? 'get' : 'post'
-        form_class = html_options.delete('form_class') || 'button_to'
-
+        form_options = html_options.delete('form') || {}
+        form_options[:class] ||= html_options.delete('form_class') || 'button_to'
+        
         remote = html_options.delete('remote')
-
+        
         request_token_tag = ''
         if form_method == 'post' && protect_against_forgery?
           request_token_tag = tag(:input, :type => "hidden", :name => request_forgery_protection_token.to_s, :value => form_authenticity_token)
@@ -340,8 +348,10 @@ module ActionView
 
         html_options.merge!("type" => "submit", "value" => name)
 
-        ("<form method=\"#{form_method}\" action=\"#{ERB::Util.html_escape(url)}\" #{"data-remote=\"true\"" if remote} class=\"#{ERB::Util.html_escape(form_class)}\"><div>" +
-          method_tag + tag("input", html_options) + request_token_tag + "</div></form>").html_safe
+        form_options.merge!(:method => form_method, :action => url)
+        form_options.merge!("data-remote" => "true") if remote
+        
+        "#{tag(:form, form_options, true)}<div>#{method_tag}#{tag("input", html_options)}#{request_token_tag}</div></form>".html_safe
       end
 
 
diff --git a/actionpack/lib/action_view/lookup_context.rb b/actionpack/lib/action_view/lookup_context.rb
index 9ec410ac2b..fa4bf70f77 100644
--- a/actionpack/lib/action_view/lookup_context.rb
+++ b/actionpack/lib/action_view/lookup_context.rb
@@ -1,5 +1,6 @@
 require 'active_support/core_ext/array/wrap'
 require 'active_support/core_ext/object/blank'
+require 'active_support/core_ext/module/remove_method'
 
 module ActionView
   # = Action View Lookup Context
@@ -17,23 +18,25 @@ module ActionView
     mattr_accessor :registered_details
     self.registered_details = []
 
-    mattr_accessor :registered_detail_setters
-    self.registered_detail_setters = []
-
     def self.register_detail(name, options = {}, &block)
       self.registered_details << name
-      self.registered_detail_setters << [name, "#{name}="]
+      initialize = registered_details.map { |n| "self.#{n} = details[:#{n}]" }
 
-      Accessors.send :define_method, :"_#{name}_defaults", &block
+      Accessors.send :define_method, :"default_#{name}", &block
       Accessors.module_eval <<-METHOD, __FILE__, __LINE__ + 1
         def #{name}
           @details[:#{name}]
         end
 
         def #{name}=(value)
-          value = Array.wrap(value.presence || _#{name}_defaults)
+          value = Array.wrap(value.presence || default_#{name})
           _set_detail(:#{name}, value) if value != @details[:#{name}]
         end
+
+        remove_possible_method :initialize_details
+        def initialize_details(details)
+          #{initialize.join("\n")}
+        end
       METHOD
     end
 
@@ -41,8 +44,9 @@ module ActionView
     module Accessors #:nodoc:
     end
 
-    register_detail(:formats) { Mime::SET.symbols }
     register_detail(:locale)  { [I18n.locale, I18n.default_locale] }
+    register_detail(:formats) { Mime::SET.symbols }
+    register_detail(:handlers){ Template::Handlers.extensions }
 
     class DetailsKey #:nodoc:
       alias :eql? :equal?
@@ -60,18 +64,34 @@ module ActionView
       end
     end
 
-    def initialize(view_paths, details = {}, prefixes = [])
-      @details, @details_key = { :handlers => default_handlers }, nil
-      @frozen_formats, @skip_default_locale = false, false
-      @cache = true
-      @prefixes = prefixes
+    # Add caching behavior on top of Details.
+    module DetailsCache
+      attr_accessor :cache
 
-      self.view_paths = view_paths
-      self.registered_detail_setters.each do |key, setter|
-        send(setter, details[key])
+      # Calculate the details key. Remove the handlers from calculation to improve performance
+      # since the user cannot modify it explicitly.
+      def details_key #:nodoc:
+        @details_key ||= DetailsKey.get(@details) if @cache
+      end
+
+      # Temporary skip passing the details_key forward.
+      def disable_cache
+        old_value, @cache = @cache, false
+        yield
+      ensure
+        @cache = old_value
+      end
+
+    protected
+
+      def _set_detail(key, value)
+        @details_key = nil
+        @details = @details.dup if @details.frozen?
+        @details[key] = value.freeze
       end
     end
 
+    # Helpers related to template lookup using the lookup context information.
     module ViewPaths
       attr_reader :view_paths
 
@@ -81,17 +101,17 @@ module ActionView
         @view_paths = ActionView::PathSet.new(Array.wrap(paths))
       end
 
-      def find(name, prefixes = [], partial = false, keys = [])
-        @view_paths.find(*args_for_lookup(name, prefixes, partial, keys))
+      def find(name, prefixes = [], partial = false, keys = [], options = {})
+        @view_paths.find(*args_for_lookup(name, prefixes, partial, keys, options))
       end
       alias :find_template :find
 
-      def find_all(name, prefixes = [], partial = false, keys = [])
-        @view_paths.find_all(*args_for_lookup(name, prefixes, partial, keys))
+      def find_all(name, prefixes = [], partial = false, keys = [], options = {})
+        @view_paths.find_all(*args_for_lookup(name, prefixes, partial, keys, options))
       end
 
-      def exists?(name, prefixes = [], partial = false, keys = [])
-        @view_paths.exists?(*args_for_lookup(name, prefixes, partial, keys))
+      def exists?(name, prefixes = [], partial = false, keys = [], options = {})
+        @view_paths.exists?(*args_for_lookup(name, prefixes, partial, keys, options))
       end
       alias :template_exists? :exists?
 
@@ -110,16 +130,29 @@ module ActionView
 
     protected
 
-      def args_for_lookup(name, prefixes, partial, keys) #:nodoc:
+      def args_for_lookup(name, prefixes, partial, keys, details_options) #:nodoc:
         name, prefixes = normalize_name(name, prefixes)
-        [name, prefixes, partial || false, @details, details_key, keys]
+        details, details_key = detail_args_for(details_options)
+        [name, prefixes, partial || false, details, details_key, keys]
+      end
+
+      # Compute details hash and key according to user options (e.g. passed from #render).
+      def detail_args_for(options)
+        return @details, details_key if options.empty? # most common path.
+        user_details = @details.merge(options)
+        [user_details, DetailsKey.get(user_details)]
       end
 
       # Support legacy foo.erb names even though we now ignore .erb
       # as well as incorrectly putting part of the path in the template
       # name instead of the prefix.
       def normalize_name(name, prefixes) #:nodoc:
-        name  = name.to_s.gsub(handlers_regexp, '')
+        name  = name.to_s.sub(handlers_regexp) do |match|
+          ActiveSupport::Deprecation.warn "Passing a template handler in the template name is deprecated. " \
+            "You can simply remove the handler name or pass render :handlers => [:#{match[1..-1]}] instead.", caller
+          ""
+        end
+
         parts = name.split('/')
         name  = parts.pop
 
@@ -132,120 +165,82 @@ module ActionView
         return name, prefixes
       end
 
-      def default_handlers #:nodoc:
-        @@default_handlers ||= Template::Handlers.extensions
-      end
-
       def handlers_regexp #:nodoc:
         @@handlers_regexp ||= /\.(?:#{default_handlers.join('|')})$/
       end
     end
 
-    module Details
-      attr_accessor :cache
-
-      # Calculate the details key. Remove the handlers from calculation to improve performance
-      # since the user cannot modify it explicitly.
-      def details_key #:nodoc:
-        @details_key ||= DetailsKey.get(@details) if @cache
-      end
-
-      # Temporary skip passing the details_key forward.
-      def disable_cache
-        old_value, @cache = @cache, false
-        yield
-      ensure
-        @cache = old_value
-      end
+    include Accessors
+    include DetailsCache
+    include ViewPaths
 
-      # Freeze the current formats in the lookup context. By freezing them, you are guaranteeing
-      # that next template lookups are not going to modify the formats. The controller can also
-      # use this, to ensure that formats won't be further modified (as it does in respond_to blocks).
-      def freeze_formats(formats, unless_frozen=false) #:nodoc:
-        return if unless_frozen && @frozen_formats
-        self.formats = formats
-        @frozen_formats = true
-      end
+    def initialize(view_paths, details = {}, prefixes = [])
+      @details, @details_key = {}, nil
+      @frozen_formats, @skip_default_locale = false, false
+      @cache = true
+      @prefixes = prefixes
 
-      # Overload formats= to expand ["*/*"] values and automatically
-      # add :html as fallback to :js.
-      def formats=(values)
-        if values
-          values.concat(_formats_defaults) if values.delete "*/*"
-          values << :html if values == [:js]
-        end
-        super(values)
-      end
+      self.view_paths = view_paths
+      initialize_details(details)
+    end
 
-      # Do not use the default locale on template lookup.
-      def skip_default_locale!
-        @skip_default_locale = true
-        self.locale = nil
-      end
+    # Freeze the current formats in the lookup context. By freezing them, you
+    # that next template lookups are not going to modify the formats. The con
+    # use this, to ensure that formats won't be further modified (as it does
+    def freeze_formats(formats, unless_frozen=false) #:nodoc:
+      return if unless_frozen && @frozen_formats
+      self.formats = formats
+      @frozen_formats = true
+    end
 
-      # Overload locale to return a symbol instead of array.
-      def locale
-        @details[:locale].first
+    # Override formats= to expand ["*/*"] values and automatically
+    # add :html as fallback to :js.
+    def formats=(values)
+      if values
+        values.concat(default_formats) if values.delete "*/*"
+        values << :html if values == [:js]
       end
+      super(values)
+    end
 
-      # Overload locale= to also set the I18n.locale. If the current I18n.config object responds
-      # to original_config, it means that it's has a copy of the original I18n configuration and it's
-      # acting as proxy, which we need to skip.
-      def locale=(value)
-        if value
-          config = I18n.config.respond_to?(:original_config) ? I18n.config.original_config : I18n.config
-          config.locale = value
-        end
+    # Do not use the default locale on template lookup.
+    def skip_default_locale!
+      @skip_default_locale = true
+      self.locale = nil
+    end
 
-        super(@skip_default_locale ? I18n.locale : _locale_defaults)
-      end
+    # Override locale to return a symbol instead of array.
+    def locale
+      @details[:locale].first
+    end
 
-      # A method which only uses the first format in the formats array for layout lookup.
-      # This method plays straight with instance variables for performance reasons.
-      def with_layout_format
-        if formats.size == 1
-          yield
-        else
-          old_formats = formats
-          _set_detail(:formats, formats[0,1])
-
-          begin
-            yield
-          ensure
-            _set_detail(:formats, old_formats)
-          end
-        end
+    # Overload locale= to also set the I18n.locale. If the current I18n.config object responds
+    # to original_config, it means that it's has a copy of the original I18n configuration and it's
+    # acting as proxy, which we need to skip.
+    def locale=(value)
+      if value
+        config = I18n.config.respond_to?(:original_config) ? I18n.config.original_config : I18n.config
+        config.locale = value
       end
 
-      # Update the details keys by merging the given hash into the current
-      # details hash. If a block is given, the details are modified just during
-      # the execution of the block and reverted to the previous value after.
-      def update_details(new_details)
-        old_details = @details.dup
+      super(@skip_default_locale ? I18n.locale : default_locale)
+    end
 
-        registered_detail_setters.each do |key, setter|
-          send(setter, new_details[key]) if new_details.key?(key)
-        end
+    # A method which only uses the first format in the formats array for layout lookup.
+    # This method plays straight with instance variables for performance reasons.
+    def with_layout_format
+      if formats.size == 1
+        yield
+      else
+        old_formats = formats
+        _set_detail(:formats, formats[0,1])
 
         begin
           yield
         ensure
-          @details_key = nil
-          @details = old_details
+          _set_detail(:formats, old_formats)
         end
       end
-
-    protected
-
-      def _set_detail(key, value)
-        @details_key = nil
-        @details = @details.dup if @details.frozen?
-        @details[key] = value.freeze
-      end
     end
-
-    include Accessors
-    include Details
-    include ViewPaths
   end
 end
diff --git a/actionpack/lib/action_view/renderer/abstract_renderer.rb b/actionpack/lib/action_view/renderer/abstract_renderer.rb
index 60c527beeb..c0936441ac 100644
--- a/actionpack/lib/action_view/renderer/abstract_renderer.rb
+++ b/actionpack/lib/action_view/renderer/abstract_renderer.rb
@@ -11,15 +11,22 @@ module ActionView
       raise NotImplementedError
     end
 
-    # Checks if the given path contains a format and if so, change
-    # the lookup context to take this new format into account.
-    def wrap_formats(value)
-      return yield unless value.is_a?(String)
-
-      if value.sub!(formats_regexp, "")
-        update_details(:formats => [$1.to_sym]){ yield }
-      else
-        yield
+    protected
+    
+    def extract_details(options)
+      details = {}
+      @lookup_context.registered_details.each do |key|
+        next unless value = options[key]
+        details[key] = Array.wrap(value)
+      end
+      details
+    end
+    
+    def extract_format(value, details)
+      if value.is_a?(String) && value.sub!(formats_regexp, "")
+        ActiveSupport::Deprecation.warn "Passing the format in the template name is deprecated. " \
+          "Please pass render with :formats => [:#{$1}] instead.", caller
+        details[:formats] ||= [$1.to_sym]
       end
     end
 
@@ -27,8 +34,6 @@ module ActionView
       @@formats_regexp ||= /\.(#{Mime::SET.symbols.join('|')})$/
     end
 
-    protected
-
     def instrument(name, options={})
       ActiveSupport::Notifications.instrument("render_#{name}.action_view", options){ yield }
     end
diff --git a/actionpack/lib/action_view/renderer/partial_renderer.rb b/actionpack/lib/action_view/renderer/partial_renderer.rb
index cd0f7054a9..e808fa3415 100644
--- a/actionpack/lib/action_view/renderer/partial_renderer.rb
+++ b/actionpack/lib/action_view/renderer/partial_renderer.rb
@@ -216,18 +216,15 @@ module ActionView
 
     def render(context, options, block)
       setup(context, options, block)
+      identifier = (@template = find_partial) ? @template.identifier : @path
 
-      wrap_formats(@path) do
-        identifier = ((@template = find_partial) ? @template.identifier : @path)
-
-        if @collection
-          instrument(:collection, :identifier => identifier || "collection", :count => @collection.size) do
-            render_collection
-          end
-        else
-          instrument(:partial, :identifier => identifier) do
-            render_partial
-          end
+      if @collection
+        instrument(:collection, :identifier => identifier || "collection", :count => @collection.size) do
+          render_collection
+        end
+      else
+        instrument(:partial, :identifier => identifier) do
+          render_partial
         end
       end
     end
@@ -271,6 +268,7 @@ module ActionView
       @options = options
       @locals  = options[:locals] || {}
       @block   = block
+      @details = extract_details(options)
 
       if String === partial
         @object     = options[:object]
@@ -299,6 +297,7 @@ module ActionView
                                 "and is followed by any combinations of letters, numbers, or underscores.")
       end
 
+      extract_format(@path, @details)
       self
     end
 
@@ -326,7 +325,7 @@ module ActionView
 
     def find_template(path=@path, locals=@locals.keys)
       prefixes = path.include?(?/) ? [] : @lookup_context.prefixes
-      @lookup_context.find_template(path, prefixes, true, locals)
+      @lookup_context.find_template(path, prefixes, true, locals, @details)
     end
 
     def collection_with_template
diff --git a/actionpack/lib/action_view/renderer/template_renderer.rb b/actionpack/lib/action_view/renderer/template_renderer.rb
index d04c00fd40..ac91d333ba 100644
--- a/actionpack/lib/action_view/renderer/template_renderer.rb
+++ b/actionpack/lib/action_view/renderer/template_renderer.rb
@@ -4,13 +4,12 @@ require 'active_support/core_ext/array/wrap'
 module ActionView
   class TemplateRenderer < AbstractRenderer #:nodoc:
     def render(context, options)
-      @view = context
-
-      wrap_formats(options[:template] || options[:file]) do
-        template = determine_template(options)
-        freeze_formats(template.formats, true)
-        render_template(template, options[:layout], options[:locals])
-      end
+      @view    = context
+      @details = extract_details(options)
+      extract_format(options[:file] || options[:template], @details)
+      template = determine_template(options)
+      freeze_formats(template.formats, true)
+      render_template(template, options[:layout], options[:locals])
     end
 
     # Determine the template to be rendered using the given options.
@@ -20,13 +19,13 @@ module ActionView
       if options.key?(:text)
         Template::Text.new(options[:text], formats.try(:first))
       elsif options.key?(:file)
-        with_fallbacks { find_template(options[:file], nil, false, keys) }
+        with_fallbacks { find_template(options[:file], nil, false, keys, @details) }
       elsif options.key?(:inline)
         handler = Template.handler_for_extension(options[:type] || "erb")
         Template.new(options[:inline], "inline template", handler, :locals => keys)
       elsif options.key?(:template)
         options[:template].respond_to?(:render) ?
-          options[:template] : find_template(options[:template], options[:prefixes], false, keys)
+          options[:template] : find_template(options[:template], options[:prefixes], false, keys, @details)
       end
     end
 
@@ -62,12 +61,11 @@ module ActionView
       begin
         with_layout_format do
           layout =~ /^\// ?
-            with_fallbacks { find_template(layout, nil, false, keys) } : find_template(layout, nil, false, keys)
+            with_fallbacks { find_template(layout, nil, false, keys, @details) } : find_template(layout, nil, false, keys, @details)
         end
       rescue ActionView::MissingTemplate
-        update_details(:formats => nil) do
-          raise unless template_exists?(layout)
-        end
+        all_details = @details.merge(:formats => @lookup_context.default_formats)
+        raise unless template_exists?(layout, nil, false, keys, all_details)
       end
     end
   end
diff --git a/actionpack/lib/action_view/test_case.rb b/actionpack/lib/action_view/test_case.rb
index 2cc85a9f69..c4d51d7946 100644
--- a/actionpack/lib/action_view/test_case.rb
+++ b/actionpack/lib/action_view/test_case.rb
@@ -54,10 +54,8 @@ module ActionView
         end
 
         def determine_default_helper_class(name)
-          mod = name.sub(/Test$/, '').constantize
+          mod = name.sub(/Test$/, '').safe_constantize
           mod.is_a?(Class) ? nil : mod
-        rescue NameError
-          nil
         end
 
         def helper_method(*methods)
diff --git a/actionpack/lib/sprockets/assets.rake b/actionpack/lib/sprockets/assets.rake
index 9b2f3a3f94..bb5cf6740a 100644
--- a/actionpack/lib/sprockets/assets.rake
+++ b/actionpack/lib/sprockets/assets.rake
@@ -6,58 +6,55 @@ namespace :assets do
     if ENV["RAILS_GROUPS"].to_s.empty? || ENV["RAILS_ENV"].to_s.empty?
       ENV["RAILS_GROUPS"] ||= "assets"
       ENV["RAILS_ENV"]    ||= "production"
-      Kernel.exec $0, *ARGV
+      ruby $0, *ARGV
     else
-      Rake::Task["environment"].invoke
+      require "fileutils"
       Rake::Task["tmp:cache:clear"].invoke
+      Rake::Task["assets:environment"].invoke
 
-      # Ensure that action view is loaded and the appropriate sprockets hooks get executed
-      ActionView::Base
-
-      # Always compile files
-      Rails.application.config.assets.compile = true
+      unless Rails.application.config.assets.enabled
+        raise "Cannot precompile assets if sprockets is disabled. Please set config.assets.enabled to true"
+      end
 
-      # Always ignore asset host
-      Rails.application.config.action_controller.asset_host = nil
+      # Ensure that action view is loaded and the appropriate sprockets hooks get executed
+      _ = ActionView::Base
 
       config = Rails.application.config
+      config.assets.compile = true
+      config.assets.digest = false if ENV["RAILS_ASSETS_NONDIGEST"]
+
       env    = Rails.application.assets
-      target = Pathname.new(File.join(Rails.public_path, config.assets.prefix))
-      manifest = {}
+
+      # Always compile files and avoid use of existing precompiled assets
+      config.assets.compile = true
+      config.assets.digests = {}
+
+      target = File.join(Rails.public_path, config.assets.prefix)
+      static_compiler = Sprockets::StaticCompiler.new(env, target, :digest => config.assets.digest)
+
+      manifest = static_compiler.precompile(config.assets.precompile)
       manifest_path = config.assets.manifest || target
+      FileUtils.mkdir_p(manifest_path)
 
-      config.assets.precompile.each do |path|
-        env.each_logical_path do |logical_path|
-          if path.is_a?(Regexp)
-            next unless path.match(logical_path)
-          elsif path.is_a?(Proc)
-            next unless path.call(logical_path)
-          else
-            next unless File.fnmatch(path.to_s, logical_path)
-          end
-
-          if asset = env.find_asset(logical_path)
-            asset_path = config.assets.digest ? asset.digest_path : logical_path
-            manifest[logical_path] = asset_path
-            filename = target.join(asset_path)
-
-            mkdir_p filename.dirname
-            asset.write_to(filename)
-            asset.write_to("#{filename}.gz") if filename.to_s =~ /\.(css|js)$/
-          end
+      unless ENV["RAILS_ASSETS_NONDIGEST"]
+        File.open("#{manifest_path}/manifest.yml", 'wb') do |f|
+          YAML.dump(manifest, f)
         end
-      end
-
-      File.open("#{manifest_path}/manifest.yml", 'wb') do |f|
-        YAML.dump(manifest, f)
+        ENV["RAILS_ASSETS_NONDIGEST"] = "true"
+        ruby $0, *ARGV
       end
     end
   end
 
   desc "Remove compiled assets"
-  task :clean => [:environment, 'tmp:cache:clear'] do
+  task :clean => ['assets:environment', 'tmp:cache:clear'] do
     config = Rails.application.config
     public_asset_path = File.join(Rails.public_path, config.assets.prefix)
     rm_rf public_asset_path, :secure => true
   end
+
+  task :environment do
+    Rails.application.initialize!(:assets)
+    Sprockets::Bootstrap.new(Rails.application).run
+  end
 end
diff --git a/actionpack/lib/sprockets/bootstrap.rb b/actionpack/lib/sprockets/bootstrap.rb
new file mode 100644
index 0000000000..395b264fe7
--- /dev/null
+++ b/actionpack/lib/sprockets/bootstrap.rb
@@ -0,0 +1,37 @@
+module Sprockets
+  class Bootstrap
+    def initialize(app)
+      @app = app
+    end
+
+    # TODO: Get rid of config.assets.enabled
+    def run
+      app, config = @app, @app.config
+      return unless app.assets
+
+      config.assets.paths.each { |path| app.assets.append_path(path) }
+
+      if config.assets.compress
+        # temporarily hardcode default JS compressor to uglify. Soon, it will work
+        # the same as SCSS, where a default plugin sets the default.
+        unless config.assets.js_compressor == false
+          app.assets.js_compressor = LazyCompressor.new { Sprockets::Compressors.registered_js_compressor(config.assets.js_compressor || :uglifier) }
+        end
+
+        unless config.assets.css_compressor == false
+          app.assets.css_compressor = LazyCompressor.new { Sprockets::Compressors.registered_css_compressor(config.assets.css_compressor) }
+        end
+      end
+
+      if config.assets.compile
+        app.routes.prepend do
+          mount app.assets => config.assets.prefix
+        end
+      end
+
+      if config.assets.digest
+        app.assets = app.assets.index
+      end
+    end
+  end
+end
diff --git a/actionpack/lib/sprockets/compressors.rb b/actionpack/lib/sprockets/compressors.rb
index 351eff1085..cb3e13314b 100644
--- a/actionpack/lib/sprockets/compressors.rb
+++ b/actionpack/lib/sprockets/compressors.rb
@@ -1,4 +1,50 @@
 module Sprockets
+  module Compressors
+    @@css_compressors = {}
+    @@js_compressors = {}
+    @@default_css_compressor = nil
+    @@default_js_compressor = nil
+
+    def self.register_css_compressor(name, klass, options = {})
+      @@default_css_compressor = name.to_sym if options[:default] || @@default_css_compressor.nil?
+      @@css_compressors[name.to_sym] = {:klass => klass.to_s, :require => options[:require]}
+    end
+
+    def self.register_js_compressor(name, klass, options = {})
+      @@default_js_compressor = name.to_sym if options[:default] || @@default_js_compressor.nil?
+      @@js_compressors[name.to_sym] = {:klass => klass.to_s, :require => options[:require]}
+    end
+
+    def self.registered_css_compressor(name)
+      if name.respond_to?(:to_sym)
+        compressor = @@css_compressors[name.to_sym] || @@css_compressors[@@default_css_compressor]
+        require compressor[:require] if compressor[:require]
+        compressor[:klass].constantize.new
+      else
+        name
+      end
+    end
+
+    def self.registered_js_compressor(name)
+      if name.respond_to?(:to_sym)
+        compressor = @@js_compressors[name.to_sym] || @@js_compressors[@@default_js_compressor]
+        require compressor[:require] if compressor[:require]
+        compressor[:klass].constantize.new
+      else
+        name
+      end
+    end
+
+    # The default compressors must be registered in default plugins (ex. Sass-Rails)
+    register_css_compressor(:scss, 'Sass::Rails::Compressor', :require => 'sass/rails/compressor', :default => true)
+    register_js_compressor(:uglifier, 'Uglifier', :require => 'uglifier', :default => true)
+
+    # Automaticaly register some compressors
+    register_css_compressor(:yui, 'YUI::CssCompressor', :require => 'yui/compressor')
+    register_js_compressor(:closure, 'Closure::Compiler', :require => 'closure-compiler')
+    register_js_compressor(:yui, 'YUI::JavaScriptCompressor', :require => 'yui/compressor')
+  end
+
   # An asset compressor which does nothing.
   #
   # This compressor simply returns the asset as-is, without any compression
diff --git a/actionpack/lib/sprockets/helpers/rails_helper.rb b/actionpack/lib/sprockets/helpers/rails_helper.rb
index 457ab93ae3..e1d8fccf04 100644
--- a/actionpack/lib/sprockets/helpers/rails_helper.rb
+++ b/actionpack/lib/sprockets/helpers/rails_helper.rb
@@ -13,7 +13,6 @@ module Sprockets
           controller = self.controller if respond_to?(:controller)
           paths = RailsHelper::AssetPaths.new(config, controller)
           paths.asset_environment = asset_environment
-          paths.asset_prefix      = asset_prefix
           paths.asset_digests     = asset_digests
           paths.compile_assets    = compile_assets?
           paths.digest_assets     = digest_assets?
@@ -57,10 +56,25 @@ module Sprockets
 
       def asset_path(source, options = {})
         source = source.logical_path if source.respond_to?(:logical_path)
-        path = asset_paths.compute_public_path(source, 'assets', options.merge(:body => true))
+        path = asset_paths.compute_public_path(source, asset_prefix, options.merge(:body => true))
         options[:body] ? "#{path}?body=1" : path
       end
 
+      def image_path(source)
+        asset_path(source)
+      end
+      alias_method :path_to_image, :image_path # aliased to avoid conflicts with an image_path named route
+
+      def javascript_path(source)
+        asset_path(source)
+      end
+      alias_method :path_to_javascript, :javascript_path # aliased to avoid conflicts with an javascript_path named route
+
+      def stylesheet_path(source)
+        asset_path(source)
+      end
+      alias_method :path_to_stylesheet, :stylesheet_path # aliased to avoid conflicts with an stylesheet_path named route
+
     private
       def debug_assets?
         compile_assets? && (Rails.application.config.assets.debug || params[:debug_assets])
@@ -102,10 +116,6 @@ module Sprockets
 
         class AssetNotPrecompiledError < StandardError; end
 
-        def compute_public_path(source, dir, options = {})
-          super(source, asset_prefix, options)
-        end
-
         # Return the filesystem path for the source
         def compute_source_path(source, ext)
           asset_for(source, ext)
@@ -119,7 +129,7 @@ module Sprockets
         end
 
         def digest_for(logical_path)
-          if asset_digests && (digest = asset_digests[logical_path])
+          if digest_assets && asset_digests && (digest = asset_digests[logical_path])
             return digest
           end
 
diff --git a/actionpack/lib/sprockets/railtie.rb b/actionpack/lib/sprockets/railtie.rb
index f05d835554..6b67fb1d2d 100644
--- a/actionpack/lib/sprockets/railtie.rb
+++ b/actionpack/lib/sprockets/railtie.rb
@@ -1,7 +1,10 @@
 module Sprockets
-  autoload :Helpers, "sprockets/helpers"
+  autoload :Bootstrap,      "sprockets/bootstrap"
+  autoload :Helpers,        "sprockets/helpers"
+  autoload :Compressors,    "sprockets/compressors"
   autoload :LazyCompressor, "sprockets/compressors"
   autoload :NullCompressor, "sprockets/compressors"
+  autoload :StaticCompiler, "sprockets/static_compiler"
 
   # TODO: Get rid of config.assets.enabled
   class Railtie < ::Rails::Railtie
@@ -11,7 +14,7 @@ module Sprockets
       load "sprockets/assets.rake"
     end
 
-    initializer "sprockets.environment" do |app|
+    initializer "sprockets.environment", :group => :assets do |app|
       config = app.config
       next unless config.assets.enabled
 
@@ -50,59 +53,7 @@ module Sprockets
     # are compiled, and so that other Railties have an opportunity to
     # register compressors.
     config.after_initialize do |app|
-      next unless app.assets
-      config = app.config
-
-      config.assets.paths.each { |path| app.assets.append_path(path) }
-
-      if config.assets.compress
-        # temporarily hardcode default JS compressor to uglify. Soon, it will work
-        # the same as SCSS, where a default plugin sets the default.
-        unless config.assets.js_compressor == false
-          app.assets.js_compressor = LazyCompressor.new { expand_js_compressor(config.assets.js_compressor || :uglifier) }
-        end
-
-        unless config.assets.css_compressor == false
-          app.assets.css_compressor = LazyCompressor.new { expand_css_compressor(config.assets.css_compressor) }
-        end
-      end
-
-      if config.assets.compile
-        app.routes.prepend do
-          mount app.assets => config.assets.prefix
-        end
-      end
-
-      if config.assets.digest
-        app.assets = app.assets.index
-      end
+      Sprockets::Bootstrap.new(app).run
     end
-
-    protected
-      def expand_js_compressor(sym)
-        case sym
-        when :closure
-          require 'closure-compiler'
-          Closure::Compiler.new
-        when :uglifier
-          require 'uglifier'
-          Uglifier.new
-        when :yui
-          require 'yui/compressor'
-          YUI::JavaScriptCompressor.new
-        else
-          sym
-        end
-      end
-
-      def expand_css_compressor(sym)
-        case sym
-        when :yui
-          require 'yui/compressor'
-          YUI::CssCompressor.new
-        else
-          sym
-        end
-      end
   end
 end
diff --git a/actionpack/lib/sprockets/static_compiler.rb b/actionpack/lib/sprockets/static_compiler.rb
new file mode 100644
index 0000000000..4a0078be46
--- /dev/null
+++ b/actionpack/lib/sprockets/static_compiler.rb
@@ -0,0 +1,52 @@
+require 'fileutils'
+
+module Sprockets
+  class StaticCompiler
+    attr_accessor :env, :target, :digest
+
+    def initialize(env, target, options = {})
+      @env = env
+      @target = target
+      @digest = options.key?(:digest) ? options.delete(:digest) : true
+    end
+
+    def precompile(paths)
+      Rails.application.config.assets.digest = digest
+      manifest = {}
+
+      env.each_logical_path do |logical_path|
+        next unless precompile_path?(logical_path, paths)
+        if asset = env.find_asset(logical_path)
+          manifest[logical_path] = compile(asset)
+        end
+      end
+      manifest
+    end
+
+    def compile(asset)
+      asset_path = digest_asset(asset)
+      filename = File.join(target, asset_path)
+      FileUtils.mkdir_p File.dirname(filename)
+      asset.write_to(filename)
+      asset.write_to("#{filename}.gz") if filename.to_s =~ /\.(css|js)$/
+      asset_path
+    end
+
+    def precompile_path?(logical_path, paths)
+      paths.each do |path|
+        if path.is_a?(Regexp)
+          return true if path.match(logical_path)
+        elsif path.is_a?(Proc)
+          return true if path.call(logical_path)
+        else
+          return true if File.fnmatch(path.to_s, logical_path)
+        end
+      end
+      false
+    end
+
+    def digest_asset(asset)
+      digest ? asset.digest_path : asset.logical_path
+    end
+  end
+end