1 files changed, 1 insertions, 8 deletions
diff --git a/actionpack/lib/action_view/renderer/partial_renderer.rb b/actionpack/lib/action_view/renderer/partial_renderer.rb
index 374bdb62f5..e231aade01 100644
--- a/actionpack/lib/action_view/renderer/partial_renderer.rb
+++ b/actionpack/lib/action_view/renderer/partial_renderer.rb
@@ -300,7 +300,6 @@ module ActionView
                                 "and is followed by any combinations of letters, numbers, or underscores.")
       end
 
-      extract_format(@path, @details)
       self
     end
 
@@ -369,13 +368,7 @@ module ActionView
       path = if object.respond_to?(:to_partial_path)
         object.to_partial_path
       else
-        klass = object.class
-        if klass.respond_to?(:model_name)
-          ActiveSupport::Deprecation.warn "ActiveModel-compatible objects whose classes return a #model_name that responds to #partial_path are deprecated. Please respond to #to_partial_path directly instead."
-          klass.model_name.partial_path
-        else
-          raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object that returns a valid partial path.")
-        end
+        raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object. It must implement :to_partial_path.")
       end
 
       @partial_names[path] ||= merge_prefix_into_object_path(@context_prefix, path.dup)