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-rw-r--r--actionmailer/lib/action_mailer.rb7
1 files changed, 7 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
index 291a8c1e34..312dd1997c 100644
--- a/actionmailer/lib/action_mailer.rb
+++ b/actionmailer/lib/action_mailer.rb
@@ -49,3 +49,10 @@ module ActionMailer
autoload :MessageDelivery
autoload :DeliveryJob
end
+
+autoload :Mime, 'action_dispatch/http/mime_type'
+
+ActiveSupport.on_load(:action_view) do
+ ActionView::Base.default_formats ||= Mime::SET.symbols
+ ActionView::Template::Types.delegate_to Mime
+end