发送一封电子邮件时，日志会显示该电子邮件两次？虽然只发送一次？

Question

在我的应用程序中，DJ 发送了一封电子邮件，但由于某种原因，我在日志文件中看到该电子邮件两次，尽管它只发送一次？我在日志中确认 DJ 仅运行一次并且 user_mailer 仅运行一次。那么为什么我会在日志文件中看到该电子邮件两次？ Rails 在做什么？

Rendered user_mailer/room_notification.text.erb (0.9ms)

Sent mail to [email protected] (1097ms)
Date: Fri, 30 Sep 2011 13:34:56 -0700
From: "roomxcom" <no-reply@roomxcom>
To: [email protected]
Message-ID: <[email protected]>
Subject: [Email Testing] Test 12
Mime-Version: 1.0
Content-Type: text/plain;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

AAAAA Did something:

Test 12

http://localhost:3000/c19

Sent mail to [email protected] (3510ms)
Date: Fri, 30 Sep 2011 13:34:56 -0700
From: "roomxcom" <no-reply@roomxcom>
To: [email protected]
Message-ID: <[email protected]>
Subject: [Email Testing] Test 12
Mime-Version: 1.0
Content-Type: text/plain;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

AAAAA Did something:

Test 12

http://localhost:3000/c19
  SQL (0.1ms)  BEGIN
  AREL (0.3ms)  DELETE FROM "delayed_jobs" WHERE "delayed_jobs"."id" = 25
  SQL (0.4ms)  COMMIT

延迟作业：

UserMailer.delay.room_notification(room, record.user, room_member.user, record.item)

用户邮件程序：

def room_notification(room, user_creator, user_recipient, item)
  ...
mail( :from => "XXXX <[email protected]>",
      :to => user_recipient.email,
      :subject => "[#{@room.title}] #{@item.title}"
    ).deliver

知道发生了什么以及为什么 Rails 在日志中显示电子邮件两次吗？谢谢

Answer 1

编辑：现在是白天，我喝了一些咖啡，这里有一个更清晰的解释...

这一行将消息添加到队列中：

UserMailer.delay.room_notification(room, record.user, room_member.user, record.item)

因此 Delayed_job 然后调用 UserMailer< 中的 room_notification 方法/code> 发送邮件：

def room_notification(room, user_creator, user_recipient, item)
  # ...
  mail(:from => "XXXX <[email protected]>",
       :to => user_recipient.email,
       :subject => "[#{@room.title}] #{@item.title}"
  ).deliver
end

这本身就足以发送邮件，但在 mail 方法的末尾还有一个多余的 .deliver ，因此它正在发送两次。

TL;DR 在 room_notification 方法中从 mail(...) 中删除 .deliver ，一切都应该没问题。