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-rw-r--r--actionmailer/lib/action_mailer/base.rb6
1 files changed, 4 insertions, 2 deletions
diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index ada86fbc4f..9dcd4bf554 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -373,8 +373,6 @@ module ActionMailer
include AbstractController::AssetPaths
include AbstractController::Callbacks
- self.protected_instance_variables = [:@_action_has_layout]
-
helper ActionMailer::MailHelper
private_class_method :new #:nodoc:
@@ -387,6 +385,10 @@ module ActionMailer
parts_order: [ "text/plain", "text/enriched", "text/html" ]
}.freeze
+ def self.default_protected_instance_vars
+ super.concat [:@_action_has_layout]
+ end
+
class << self
# Register one or more Observers which will be notified when mail is delivered.
def register_observers(*observers)