pass yielded arguments to block for ActionView::Base#render with :lay…

…out [#847 state:resolved]

Signed-off-by: Joshua Peek <josh@joshpeek.com>

actionpack/lib/action_view/base.rb

@@ -246,12 +246,18 @@ def render(options = {}, local_assigns = {}, &block) #:nodoc:
 
         if partial_layout = options.delete(:layout)
           if block_given?
-            wrap_content_for_layout capture(&block) do
+            begin
+              @_proc_for_layout = block
               concat(render(options.merge(:partial => partial_layout)))
+            ensure
+              @_proc_for_layout = nil
             end
           else
-            wrap_content_for_layout render(options) do
+            begin
+              original_content_for_layout, @content_for_layout = @content_for_layout, render(options)
               render(options.merge(:partial => partial_layout))
+            ensure
+              @content_for_layout = original_content_for_layout
             end
           end
         elsif options[:file]
@@ -367,13 +373,6 @@ def render_inline(text, local_assigns = {}, type = nil)
         InlineTemplate.new(text, type).render(self, local_assigns)
       end
 
-      def wrap_content_for_layout(content)
-        original_content_for_layout, @content_for_layout = @content_for_layout, content
-        yield
-      ensure
-        @content_for_layout = original_content_for_layout
-      end
-
       # Evaluate the local assigns and pushes them to the view.
       def evaluate_assigns
         unless @assigns_added
@@ -392,11 +391,5 @@ def set_controller_content_type(content_type)
           controller.response.content_type ||= content_type
         end
       end
-
-      def execute(method, local_assigns = {})
-        send(method, local_assigns) do |*names|
-          instance_variable_get "@content_for_#{names.first || 'layout'}"
-        end
-      end
   end
 end

actionpack/lib/action_view/partials.rb

@@ -68,7 +68,7 @@ module ActionView
   #
   #   <%# app/views/users/_editor.html.erb &>
   #   <div id="editor">
-  #     Deadline: $<%= user.deadline %>
+  #     Deadline: <%= user.deadline %>
   #     <%= yield %>
   #   </div>
   #
@@ -82,7 +82,7 @@ module ActionView
   #
   #   Here's the editor:
   #   <div id="editor">
-  #     Deadline: $<%= user.deadline %>
+  #     Deadline: <%= user.deadline %>
   #     Name: <%= user.name %>
   #   </div>
   #
@@ -101,6 +101,40 @@ module ActionView
   #   </div>
   #
   # As you can see, the <tt>:locals</tt> hash is shared between both the partial and its layout.
+  #
+  # If you pass arguments to "yield" then this will be passed to the block. One way to use this is to pass
+  # an array to layout and treat it as an enumerable.
+  #
+  #   <%# app/views/users/_user.html.erb &>
+  #   <div class="user">
+  #     Budget: $<%= user.budget %>
+  #     <%= yield user %>
+  #   </div>
+  #
+  #   <%# app/views/users/index.html.erb &>
+  #   <% render :layout => @users do |user| %>
+  #     Title: <%= user.title %>
+  #   <% end %>
+  #
+  # This will render the layout for each user and yield to the block, passing the user, each time.
+  #
+  # You can also yield multiple times in one layout and use block arguments to differentiate the sections.
+  #
+  #   <%# app/views/users/_user.html.erb &>
+  #   <div class="user">
+  #     <%= yield user, :header %>
+  #     Budget: $<%= user.budget %>
+  #     <%= yield user, :footer %>
+  #   </div>
+  #
+  #   <%# app/views/users/index.html.erb &>
+  #   <% render :layout => @users do |user, section| %>
+  #     <%- case section when :header -%>
+  #       Title: <%= user.title %>
+  #     <%- when :footer -%>
+  #       Deadline: <%= user.deadline %>
+  #     <%- end -%>
+  #   <% end %>
   module Partials
     extend ActiveSupport::Memoizable
 

actionpack/lib/action_view/renderable.rb

@@ -31,7 +31,14 @@ def render(view, local_assigns = {})
 
       view.send(:evaluate_assigns)
       view.send(:set_controller_content_type, mime_type) if respond_to?(:mime_type)
-      view.send(:execute, method_name(local_assigns), local_assigns)
+
+      view.send(method_name(local_assigns), local_assigns) do |*names|
+        if proc = view.instance_variable_get("@_proc_for_layout")
+          view.capture(*names, &proc)
+        else
+          view.instance_variable_get("@content_for_#{names.first || 'layout'}")
+        end
+      end
     end
 
     def method_name(local_assigns)

actionpack/test/controller/layout_test.rb

@@ -41,19 +41,19 @@ def setup
 
     @request.host = "www.nextangle.com"
   end
-  
+
   def test_application_layout_is_default_when_no_controller_match
     @controller = ProductController.new
     get :hello
     assert_equal 'layout_test.rhtml hello.rhtml', @response.body
   end
-  
+
   def test_controller_name_layout_name_match
     @controller = ItemController.new
     get :hello
     assert_equal 'item.rhtml hello.rhtml', @response.body
   end
-  
+
   def test_third_party_template_library_auto_discovers_layout
     ThirdPartyTemplateLibraryController.view_paths.reload!
     @controller = ThirdPartyTemplateLibraryController.new
@@ -63,14 +63,14 @@ def test_third_party_template_library_auto_discovers_layout
     assert_response :success
     assert_equal 'Mab', @response.body
   end
-  
+
   def test_namespaced_controllers_auto_detect_layouts
     @controller = ControllerNameSpace::NestedController.new
     get :hello
     assert_equal 'layouts/controller_name_space/nested', @controller.active_layout
     assert_equal 'controller_name_space/nested.rhtml hello.rhtml', @response.body
   end
-  
+
   def test_namespaced_controllers_auto_detect_layouts
     @controller = MultipleExtensions.new
     get :hello
@@ -115,7 +115,7 @@ def test_add_regexp_to_exempt_from_layout
 
   def test_rhtml_exempt_from_layout_status_should_prevent_layout_render
     ActionController::Base.exempt_from_layout :rhtml
-    
+
     assert @controller.send!(:template_exempt_from_layout?, 'test.rhtml')
     assert @controller.send!(:template_exempt_from_layout?, 'hello.rhtml')
 
@@ -156,19 +156,19 @@ def test_layout_set_when_using_default_layout
     get :hello
     assert_equal 'layouts/layout_test', @response.layout
   end
-  
+
   def test_layout_set_when_set_in_controller
     @controller = HasOwnLayoutController.new
     get :hello
     assert_equal 'layouts/item', @response.layout
   end
-  
+
   def test_layout_set_when_using_render
     @controller = SetsLayoutInRenderController.new
     get :hello
     assert_equal 'layouts/third_party_template_library', @response.layout
   end
-  
+
   def test_layout_is_not_set_when_none_rendered
     @controller = RendersNoLayoutController.new
     get :hello
@@ -249,4 +249,3 @@ def test_symlinked_layout_is_rendered
     assert_equal "layouts/symlinked/symlinked_layout", @response.layout
   end
 end
-

actionpack/test/controller/new_render_test.rb

@@ -435,6 +435,10 @@ def render_using_layout_around_block
     render :action => "using_layout_around_block"
   end
 
+  def render_using_layout_around_block_with_args
+    render :action => "using_layout_around_block_with_args"
+  end
+
   def render_using_layout_around_block_in_main_layout_and_within_content_for_layout
     render :action => "using_layout_around_block"
   end
@@ -969,4 +973,9 @@ def test_using_layout_around_block_in_main_layout_and_within_content_for_layout
     get :render_using_layout_around_block_in_main_layout_and_within_content_for_layout
     assert_equal "Before (Anthony)\nInside from first block in layout\nAfter\nBefore (David)\nInside from block\nAfter\nBefore (Ramm)\nInside from second block in layout\nAfter\n", @response.body
   end
+
+  def test_using_layout_around_block_with_args
+    get :render_using_layout_around_block_with_args
+    assert_equal "Before\narg1arg2\nAfter", @response.body
+  end
 end

actionpack/test/fixtures/test/_layout_for_block_with_args.html.erb

@@ -0,0 +1,3 @@
+Before
+<%= yield 'arg1', 'arg2' %>
+After

actionpack/test/fixtures/test/using_layout_around_block_with_args.html.erb

@@ -0,0 +1 @@
+<% render(:layout => "layout_for_block_with_args") do |*args| %><%= args.join %><% end %>