ruby-on-rails - rails 4.2 : using deliver_later with a tableless model

Question

我正在尝试使用 Rails 4.2 的 Deliver_later 方法设置联系表格。但是，我只能让 Deliver_now 工作，因为 Deliver_later 试图序列化我的对象并且每次都失败。

这是我的设置:

消息 Controller .rb

class MessagesController < ApplicationController
  def new
    @message = Message.new
  end

  def create
    @message = Message.new(params[:message])
    if @message.valid?
      ContactMailer.contact_form(@message).deliver_later
      redirect_to root_path, notice: "Message sent! Thank you for contacting us."
    else
      render :new
    end
  end
end

contact_mailer.rb

class ContactMailer < ApplicationMailer
  default :to => Rails.application.secrets['email']

  def contact_form(msg)
    @message = msg
    mail(:subject => msg.subject, from: msg.email)
  end
end

消息.rb

class Message
    include ActiveModel::Model
    include ActiveModel::Conversion

    ## Not sure if this is needed ##
    include ActiveModel::Serialization

    extend ActiveModel::Naming

    attr_accessor :name, :subject, :email, :body

    validates_presence_of :email, :body
    validates_format_of :email, with: /\A([^\s]+)((?:[-a-z0-9]\.)[a-z]{2,})\z/i
    validates_length_of :body, :maximum => 1000

    def initialize(attributes = {})
      attributes.each { |name, value| send("#{name}=", value) }
    end

    ## Not sure if this is needed ##
    def attribtues
      {'name' => nil, 'subject' => nil, 'email' => nil, 'body' => nil}
    end
end

调用 ContactMailer.contact_form(@message).deliver_later 时出现的错误是:

ActiveJob::SerializationError in MessagesController#create 

Unsupported argument type: Message
Extracted source (around line #10): 
if @message.valid?
  ContactMailer.contact_form(@message).deliver_later
  redirect_to root_path, notice: "Message sent! Thank you for contacting us."
else
  render :new

理想情况下，我希望这是一个后台进程。我很快就会添加像 Sidekiq 这样的东西，但我认为最好事先解决这个序列化问题。

任何帮助表示赞赏!谢谢 :)

Answer 1

避免必须使用 ActiveRecord 支持对象或创建不必要的表的简单解决方案:

除了将 Message 对象传递给 contact_form 方法之外，您还可以将消息参数传递给 contact_form 方法，然后在该方法中初始化 Message 对象。

这将解决问题而无需创建表，因为您正在延迟作业 worker 的内存空间中初始化对象。

例如:

消息 Controller .rb

MessagesController < ApplicationController
    def new
        @message = Message.new
    end

    def create
        @message = Message.new(params[:message])

        if @message.valid?
            ContactMailer.contact_form(params[:message]).deliver_later
            redirect_to root_path, notice: "Message sent! Thank you for contacting us."
        else
            render :new
        end
    end
end

contact_mailer.rb

class ContactMailer < ApplicationMailer
    default :to => Rails.application.secrets['email']

    def contact_form(msg_params)
        @message = Message.new(msg_params)
        mail(:subject => msg.subject, from: msg.email)
    end
end