Ensure render :file works inside templates

actionmailer/lib/action_mailer/base.rb

@@ -530,7 +530,7 @@ module ActionMailer #:nodoc:
       end
 
       def render_message(method_name, body)
-        render :file => method_name, :body => body
+        render :file => method_name, :body => body, :use_full_path => true
       end
 
       def render(opts)
@@ -538,6 +538,7 @@ module ActionMailer #:nodoc:
         if opts[:file] && opts[:file] !~ /\//
           opts[:file] = "#{mailer_name}/#{opts[:file]}"
         end
+        opts[:use_full_path] = true
         initialize_template_class(body).render(opts)
       end
 

actionpack/lib/action_view/base.rb

@@ -253,6 +253,7 @@ If you are rendering a subtemplate, you must now use controller-like partial syn
       elsif options == :update
         update_page(&block)
       elsif options.is_a?(Hash)
+        use_full_path = options[:use_full_path]
         options = options.reverse_merge(:locals => {}, :use_full_path => true)
 
         if partial_layout = options.delete(:layout)
@@ -266,7 +267,7 @@ If you are rendering a subtemplate, you must now use controller-like partial syn
             end
           end
         elsif options[:file]
-          render_file(options[:file], options[:use_full_path], options[:locals])
+          render_file(options[:file], use_full_path || false, options[:locals])
         elsif options[:partial] && options[:collection]
           render_partial_collection(options[:partial], options[:collection], options[:spacer_template], options[:locals])
         elsif options[:partial]

actionpack/test/controller/new_render_test.rb

@@ -68,6 +68,11 @@ class NewRenderTestController < ActionController::Base
     path = File.join(File.dirname(__FILE__), '../fixtures/test/render_file_with_ivar.erb')
     render :file => path
   end
+  
+  def render_file_from_template
+    @secret = 'in the sauce'
+    @path = File.expand_path(File.join(File.dirname(__FILE__), '../fixtures/test/render_file_with_ivar.erb'))
+  end
 
   def render_file_with_locals
     path = File.join(File.dirname(__FILE__), '../fixtures/test/render_file_with_locals.erb')
@@ -531,6 +536,11 @@ class NewRenderTest < Test::Unit::TestCase
     get :render_file_with_locals
     assert_equal "The secret is in the sauce\n", @response.body
   end
+  
+  def test_render_file_from_template
+    get :render_file_from_template
+    assert_equal "The secret is in the sauce\n", @response.body
+  end
 
   def test_attempt_to_access_object_method
     assert_raises(ActionController::UnknownAction, "No action responded to [clone]") { get :clone }

actionpack/test/fixtures/test/render_file_from_template.html.erb

@@ -0,0 +1 @@
+<%= render :file => @path %>