Bring render_message back for 2.3 compatibility.

actionmailer/lib/action_mailer/base.rb

@@ -143,12 +143,13 @@ module ActionMailer #:nodoc:
   #       subject         "New account information"
   #       from            "system@example.com"
   #       content_type    "multipart/alternative"
+  #       body            :account => recipient
   #
   #       part :content_type => "text/html",
-  #         :body => render_message("signup-as-html", :account => recipient)
+  #         :data => render_message("signup-as-html")
   #
   #       part "text/plain" do |p|
-  #         p.body = render_message("signup-as-plain", :account => recipient)
+  #         p.body = render_message("signup-as-plain")
   #         p.content_transfer_encoding = "base64"
   #       end
   #     end
@@ -453,11 +454,13 @@ def matches_dynamic_method?(method_name) #:nodoc:
     # body, headers, etc.) can be set on it.
     def part(params)
       params = {:content_type => params} if String === params
+
       if custom_headers = params.delete(:headers)
         ActiveSupport::Deprecation.warn('Passing custom headers with :headers => {} is deprecated. ' <<
                                         'Please just pass in custom headers directly.', caller[0,10])
         params.merge!(custom_headers)
       end
+
       part = Mail::Part.new(params)
       yield part if block_given?
       @parts << part
@@ -475,6 +478,20 @@ def attachment(params, &block)
       part(params, &block)
     end
 
+    # Allow you to set assigns for your template:
+    #
+    #   body :greetings => "Hi"
+    #
+    # Will make @greetings available in the template to be rendered.
+    def body(object=nil)
+      returning(super) do # Run deprecation hooks
+        if object.is_a?(Hash)
+          @assigns_set = true
+          object.each { |k, v| instance_variable_set(:"@#{k}", v) }
+        end
+      end
+    end
+
     # Instantiate a new mailer object. If +method_name+ is not +nil+, the mailer
     # will be initialized according to the named method. If not, the mailer will
     # remain uninitialized (useful when you only need to invoke the "receive"
@@ -522,17 +539,20 @@ def deliver!(mail = @mail)
 
     private
 
-      # Allow you to set assigns for your template:
+      # Render a message but does not set it as mail body. Useful for rendering
+      # data for part and attachments.
       #
-      #   body :greetings => "Hi"
+      # Examples:
       #
-      # Will make @greetings available in the template to be rendered.
-      def body(object=nil)
-        super # Run deprecation hooks
-
-        if object.is_a?(Hash)
-          @assigns_set = true
-          object.each { |k, v| instance_variable_set(:"@#{k}", v) }
+      #   render_message "special_message"
+      #   render_message :template => "special_message"
+      #   render_message :inline => "<%= 'Hi!' %>"
+      def render_message(object)
+        case object
+        when String
+          render_to_body(:template => object)
+        else
+          render_to_body(object)
         end
       end
 

actionmailer/test/mail_service_test.rb

@@ -120,11 +120,11 @@ def multipart_with_mime_version(recipient)
     content_type "multipart/alternative"
 
     part "text/plain" do |p|
-      p.body = "blah"
+      p.body = render_message(:text => "blah")
     end
 
     part "text/html" do |p|
-      p.body = "<b>blah</b>"
+      p.body = render_message(:inline => "<%= content_tag(:b, 'blah') %>")
     end
   end