Expose a _render_partial hook as thhe _render_template one and make use of it.

actionmailer/lib/action_mailer/base.rb

@@ -254,6 +254,7 @@ module ActionMailer #:nodoc:
     include Quoting
     extend  AdvAttrAccessor
 
+    include AbstractController::Logger
     include AbstractController::Rendering
     include AbstractController::LocalizedCache
     include AbstractController::Layouts

actionpack/lib/abstract_controller/rendering.rb

@@ -1,5 +1,4 @@
 require "abstract_controller/base"
-require "abstract_controller/logger"
 
 module AbstractController
   class DoubleRenderError < Error
@@ -13,8 +12,6 @@ module AbstractController
   module Rendering
     extend ActiveSupport::Concern
 
-    include AbstractController::Logger
-
     included do
       extlib_inheritable_accessor :_view_paths
       self._view_paths ||= ActionView::PathSet.new
@@ -67,7 +64,7 @@ module AbstractController
     def render_to_body(options = {})
       # TODO: Refactor so we can just use the normal template logic for this
       if options.key?(:partial)
-        view_context.render_partial(options)
+        _render_partial(options)
       else
         _determine_template(options)
         _render_template(options)
@@ -87,11 +84,18 @@ module AbstractController
     # ==== Options
     # _template<ActionView::Template>:: The template to render
     # _layout<ActionView::Template>:: The layout to wrap the template in (optional)
-    # _partial<TrueClass, FalseClass>:: Whether or not the template to be rendered is a partial
     def _render_template(options)
       view_context.render_template(options)
     end
 
+    # Renders the given partial.
+    #
+    # ==== Options
+    # partial<String|Object>:: The partial name or the object to be rendered
+    def _render_partial(options)
+      view_context.render_partial(options)
+    end
+
     # The list of view paths for this controller. See ActionView::ViewPathSet for
     # more details about writing custom view paths.
     def view_paths

actionpack/lib/action_controller/metal/rendering.rb

@@ -20,12 +20,6 @@ module ActionController
 
     def render_to_body(options)
       _process_options(options)
-
-      if options.key?(:partial)
-        options[:partial] = action_name if options[:partial] == true
-        options[:_details] = {:formats => formats}
-      end
-
       super
     end
 
@@ -43,6 +37,12 @@ module ActionController
         super
       end
 
+      def _render_partial(options)
+        options[:partial] = action_name if options[:partial] == true
+        options[:_details] = {:formats => formats}
+        super
+      end
+
       def format_for_text
         formats.first
       end