diff options
Diffstat (limited to 'actionpack/lib/action_view/render/rendering.rb')
-rw-r--r-- | actionpack/lib/action_view/render/rendering.rb | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/actionpack/lib/action_view/render/rendering.rb b/actionpack/lib/action_view/render/rendering.rb index a720012d1c..588a64a652 100644 --- a/actionpack/lib/action_view/render/rendering.rb +++ b/actionpack/lib/action_view/render/rendering.rb @@ -60,16 +60,49 @@ module ActionView end end + # You can think of a layout as a method that is called with a block. This method + # returns the block that the layout is called with. If the user calls yield :some_name, + # the block, by default, returns content_for(:some_name). If the user calls yield, + # the default block returns content_for(:layout). + # + # The user can override this default by passing a block to the layout. + # + # ==== Example + # + # # The template + # <% render :layout => "my_layout" do %>Content<% end %> + # + # # The layout + # <html><% yield %></html> + # + # In this case, instead of the default block, which would return content_for(:layout), + # this method returns the block that was passed in to render layout, and the response + # would be <html>Content</html>. + # + # Finally, the block can take block arguments, which can be passed in by yield. + # + # ==== Example + # + # # The template + # <% render :layout => "my_layout" do |name| %>Hello <%= customer.name %><% end %> + # + # # The layout + # <html><% yield Struct.new(:name).new("David") %></html> + # + # In this case, the layout would receive the block passed into <tt>render :layout</tt>, + # and the Struct specified in the layout would be passed into the block. The result + # would be <html>Hello David</html>. + def layout_proc(name) + @_default_layout ||= proc { |*names| @_content_for[names.first || :layout] } + !@_content_for.key?(name) && @_proc_for_layout || @_default_layout + end + def _render_template(template, local_assigns = {}) with_template(template) do _evaluate_assigns_and_ivars template.render(self, local_assigns) do |*names| - if !@_content_for.key?(names.first) && @_proc_for_layout - capture(*names, &@_proc_for_layout) - elsif content = @_content_for[names.first || :layout] - content - end + capture(*names, &layout_proc(names.first)) end end rescue Exception => e |