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Rails 4.0.0 (unreleased)

Rails 4.0.0.beta1 (February 25, 2013)

  • Allow passing interpolations to #default_i18n_subject, e.g.:

    # config/locales/en.yml
          subject: 'Hello, %{username}'
    # app/mailers/user_mailer.rb
    class UserMailer < ActionMailer::Base
      def welcome(user)
        mail(subject: default_i18n_subject(username:

    Olek Janiszewski

  • Eager loading made to use relation's in_clause_length instead of host's one. Fixes #8474.

    Boris Staal

  • Explicit multipart messages no longer set the order of the MIME parts. Nate Berkopec

  • Do not render views when mail() isn't called. Fixes #7761.

    Yves Senn

  • Allow delivery method options to be set per mail instance Aditya Sanghi

    If your smtp delivery settings are dynamic, you can now override settings per mail instance for e.g.

    def my_mailer(user,company)
      mail to:, subject: "Welcome!",
           delivery_method_options: { user_name: company.smtp_user,
                                      password: company.smtp_password }

    This will ensure that your default SMTP settings will be overridden by the company specific ones. You only have to override the settings that are dynamic and leave the static setting in your environment configuration file (e.g. config/environments/production.rb)

  • Allow to set default Action Mailer options via config.action_mailer.default_options= Robert Pankowecki

  • Raise an ActionView::MissingTemplate exception when no implicit template could be found. Damien Mathieu

  • Allow callbacks to be defined in mailers similar to ActionController::Base. You can configure default settings, headers, attachments, delivery settings or change delivery using before_filter, after_filter etc. Justin S. Leitgeb

Please check 3-2-stable for previous changes.

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