Return rendered template information instead of just strings

This commit introduces "rendered template" and "rendered collection"
objects.  The template renderers can now return a more complex object
than just strings.  This allows the framework to get more information
about the templates that were rendered.  In this commit we use the
rendered template object to set the "rendered_format" on the lookup
context in the controller rather than all the way in the template renderer.
That means we don't need to check the "rendered_format" every time we
render a template, we just do it once after all templates have been
rendered.

1 files changed, 7 insertions, 2 deletions

diff --git a/actionview/lib/action_view/rendering.rb b/actionview/lib/action_view/rendering.rb
index b798e80b04..699ccb0ca8 100644
--- a/actionview/lib/action_view/rendering.rb
+++ b/actionview/lib/action_view/rendering.rb
@@ -109,10 +109,15 @@ module ActionView
         context = view_context
 
         context.assign assigns if assigns
-        lookup_context.rendered_format = nil if options[:formats]
         lookup_context.variants = variant if variant
 
-        context.view_renderer.render(context, options)
+        rendered_template = context.in_rendering_context(options) do |renderer|
+          renderer.render_to_object(context, options)
+        end
+
+        lookup_context.rendered_format = rendered_template.format || lookup_context.formats.first
+
+        rendered_template.body
       end
 
       # Assign the rendered format to look up context.