发送一封电子邮件时，日志显示电子邮件两次？虽然它只发送一次？

在我的应用程序中，DJ发出一封电子邮件，但由于某种原因，我在日志文件中看到两次电子邮件，虽然它只发送一次?我在日志中确认DJ只运行一次，user_mailer只运行一次。那么为什么我在日志文件中看到两次电子邮件呢?Rails在做什么?

Rendered user_mailer/room_notification.text.erb (0.9ms)
Sent mail to rachela.xxxxxxx@gmail.com (1097ms)
Date: Fri, 30 Sep 2011 13:34:56 -0700
From: "roomxcom" <no-reply@roomxcom>
To: rachela.xxxxxxx@gmail.com
Message-ID: <123@-MacBook-Pro.local.mail>
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 rachela.xxxxxxx@gmail.com (3510ms)
Date: Fri, 30 Sep 2011 13:34:56 -0700
From: "roomxcom" <no-reply@roomxcom>
To: rachela.xxxxxxx@gmail.com
Message-ID: <123@-MacBook-Pro.local.mail>
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

推迟工作:

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

用户梅勒:

def room_notification(room, user_creator, user_recipient, item)
  ...
mail( :from => "XXXX <no-reply@XXXXXXXXXX.com>",
      :to => user_recipient.email,
      :subject => "[#{@room.title}] #{@item.title}"
    ).deliver

你知道发生了什么吗?为什么rails在日志中显示了两次电子邮件?由于

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)

那么Delayed_job然后调用UserMailer中的room_notification方法来发送邮件:

def room_notification(room, user_creator, user_recipient, item)
  # ...
  mail(:from => "XXXX <no-reply@XXXXXXXXXX.com>",
       :to => user_recipient.email,
       :subject => "[#{@room.title}] #{@item.title}"
  ).deliver
end

这本身就足够发送邮件了，但是在mail方法的末尾还有一个冗余的.deliver，所以它发送了两次。

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

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