ruby-on-rails-3 - Rails 3:Mail::Message 序列化后无法传递

Question

我想序列化一个 Mail::Message对象以便将其存储在数据库中并稍后发送。
我的第一次尝试是使用内置的 serialize像这样的 ActiveRecord 方法:

class Email < ActiveRecord::Base
  serialize :mail

  # ...

end

不幸的是，尝试保存记录导致异常

> foo.save
ArgumentError: wrong number of arguments (1 for 0)
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/mail-2.2.19/lib/mail/message.rb:1714:in `to_yaml'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:55:in `accept'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych/visitors/yaml_tree.rb:36:in `<<'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych.rb:165:in `dump'
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.7/lib/active_record/base.rb:1720:in `block in arel_attributes_values'
    (...)

所以我简单地使用 to_yaml 创建了一个自定义访问器/ from_yaml Mail::Message 的功能.但现在我遇到了这种奇怪的行为:

mail_original = UserMailer.user_welcome_email(@user)
=> #<Mail::Message:93415800, Multipart: false, Headers: <From: (...) >, <To: (...) >, <Subject: (...) >, <Mime-Version: 1.0>, <Content-Type: text/plain>>
mail_clone = Mail::Message.from_yaml mail_original.to_yaml
=> #<Mail::Message:92940980, Multipart: false, Headers: <Date: (...) >, <From: (...) >, <To: (...) >, <Message-ID: (...) >, <Subject: (...) >, <Mime-Version: 1.0>, <Content-Type: text/plain>, <Content-Transfer-Encoding: quoted-printable>>
mail_original.deliver
=> #<Mail::Message:93415800, Multipart: false, Headers: <Date: (...) >, <From: (...) >, <To: (...) >, <Message-ID: (...) >, <Subject: (...) >, <Mime-Version: 1.0>, <Content-Type: text/plain>, <Content-Transfer-Encoding: quoted-printable>>
mail_clone.deliver
Errno::ECONNREFUSED: Connection refused - connect(2)
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/smtp.rb:546:in `initialize'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/smtp.rb:546:in `open'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/smtp.rb:546:in `tcp_socket'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/smtp.rb:555:in `block in do_start'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/timeout.rb:57:in `timeout'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/timeout.rb:87:in `timeout'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/smtp.rb:555:in `do_start'
from /home/akrueger/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/smtp.rb:525:in `start'
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/mail-2.2.19/lib/mail/network/delivery_methods/smtp.rb:128:in `deliver!'
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/mail-2.2.19/lib/mail/message.rb:1989:in `do_delivery'
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/mail-2.2.19/lib/mail/message.rb:232:in `deliver'
from (irb):68
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands/console.rb:44:in `start'
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands/console.rb:8:in `start'
from /home/akrueger/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands.rb:23:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'

关于如何解决这个问题的任何想法？为什么将对象序列化为 yaml 会使 Message对象无法交付？是否有另一种方法可以正确序列化 Message反对稍后发送？

Answer 1

我意识到了 mail_clone object 没有正确的传递设置，导致 deliver 失败称呼。浏览 Rails 源代码，我找到了以下解决方案:

mail_clone = Mail::Message.from_yaml mail_original.to_yaml
ActionMailer::Base.wrap_delivery_behavior mail_clone
mail_clone.deliver

所以这可能是一种序列化 Mail::Message 的方法目的:

class Email < ActiveRecord::Base
  def mail
    @mail_cached || begin
      m = Mail::Message.from_yaml(self.read_attribute :mail)
      ActionMailer::Base.wrap_delivery_behavior m
      m
    rescue
      nil
    end
  end

  def mail=(val)
    @mail_cached = val
    write_attribute :mail, val.to_yaml
  end

  # ...
end