diff options
Diffstat (limited to 'actionpack/lib/action_view/render/rendering.rb')
| -rw-r--r-- | actionpack/lib/action_view/render/rendering.rb | 70 |
1 files changed, 48 insertions, 22 deletions
diff --git a/actionpack/lib/action_view/render/rendering.rb b/actionpack/lib/action_view/render/rendering.rb index fe785e7b20..162e38c484 100644 --- a/actionpack/lib/action_view/render/rendering.rb +++ b/actionpack/lib/action_view/render/rendering.rb @@ -51,32 +51,60 @@ module ActionView end begin - original_content_for_layout = @content_for_layout if defined?(@content_for_layout) - @content_for_layout = content + old_content, @_content_for[:layout] = @_content_for[:layout], content - @cached_content_for_layout = @content_for_layout + @cached_content_for_layout = @_content_for[:layout] _render_template(layout, locals) ensure - @content_for_layout = original_content_for_layout + @_content_for[:layout] = old_content 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 |customer| %>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 - _set_controller_content_type(template.mime_type) if template.respond_to?(:mime_type) - template.render(self, local_assigns) do |*names| - if !instance_variable_defined?(:"@content_for_#{names.first}") && - instance_variable_defined?(:@_proc_for_layout) && (proc = @_proc_for_layout) - capture(*names, &proc) - elsif instance_variable_defined?(ivar = :"@content_for_#{names.first || :layout}") - instance_variable_get(ivar) - end + capture(*names, &layout_proc(names.first)) end end rescue Exception => e - if TemplateError === e + if e.is_a?(TemplateError) e.sub_template_of(template) raise e else @@ -101,20 +129,18 @@ module ActionView end def _render_template_with_layout(template, layout = nil, options = {}, partial = false) - if controller && logger - logger.info("Rendering #{template.identifier}" + - (options[:status] ? " (#{options[:status]})" : '')) - end - + logger && logger.info("Rendering #{template.identifier}#{' (#{options[:status]})' if options[:status]}") + + locals = options[:locals] || {} + content = if partial object = partial unless partial == true _render_partial_object(template, options, object) else - _render_template(template, options[:locals] || {}) + _render_template(template, locals) end - return content unless layout - _render_content_with_layout(content, layout, options[:locals] || {}) + layout ? _render_content_with_layout(content, layout, locals) : content end end end
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