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Rails 4.2.0 (December 20, 2014)

  • MailerGenerator now generates layouts by default. The HTML mailer layout now includes <html> and <body> tags which improve the spam rating in some spam detection engines. Mailers now inherit from ApplicationMailer which sets the default layout.

    Andy Jeffries

  • link_to and url_for now generate URLs by default in templates. Passing only_path: false is no longer needed.

    Fixes #16497 and #16589.

    Xavier Noria, Richard Schneeman

  • Attachments can now be added while rendering the mail template.

    Fixes #16974.

    Christian Felder

  • Add #deliver_later and #deliver_now methods and deprecate #deliver in favor of #deliver_now. #deliver_later will enqueue a job to render and deliver the mail instead of delivering it immediately. The job is enqueued using the new Active Job framework in Rails and will use the queue that you have configured in Rails.

    DHH, Abdelkader Boudih, Cristian Bica

  • ActionMailer::Previews are now class methods instead of instance methods.

    Cristian Bica

  • Deprecate *_path helpers in email views. They generated broken links in email views and were not the intention of most developers. The *_url helper is recommended instead.

    Richard Schneeman

  • Raise an exception when attachments are added after mail is called. This is a safeguard to prevent invalid emails.

    Fixes #16163.

    Yves Senn

  • Add config.action_mailer.show_previews configuration option.

    This configuration option can be used to enable the mail preview in environments other than development (such as staging).

    Defaults to true in development and false elsewhere.

    Leonard Garvey

  • Allow preview interceptors to be registered through config.action_mailer.preview_interceptors.

    See #15739.

    Yves Senn

Please check 4-1-stable for previous changes.