Trouble implementing ActiveModel with class attributes on using DelayedJob

I am using Ruby on Rails 3.0.9 and DelayedJob 2.1 and I am trying to implement a "Contact Us" form myself using ActiveModel functionalities. So...

... in my model file I have:

class ContactUs
  include ActiveModel::Conversion
  include ActiveModel::Validations


  attr_accessor :full_name, :email, :subject, :message

  def initialize(attributes = {})
    attributes.keys.each do |attr|
      instance_variable_set "@" + attr.to_s, attributes[attr.to_sym]
    end
  end


  validates :full_name,
    :presence   => true

  validates :email,
    :presence   => true

  validates :subject,
    :presence   => true

  validates :message,
    :presence   => true


  def persist
    @persisted = true
  end

  def persisted?
    false
  end
end

... in my view file I have:

<%= form_for @contact_us, :url => contact_us_path do |f| %>
  <%= f.text_field :full_name %>
  <%= f.text_field :email %>
  <%= f.text_field :subject %>
  <%= f.text_area  :message %>
<% end %>

... in my router file I have:

match 'contact_us' => 'pages#contact_us', :via => [:get, :post]

... in my controller file I have:

class PagesController < ApplicationController
  def contact_us
    case request.request_method

    when 'GET'
      @contact_us = ContactUs.new

    when 'POST'
      @contact_us = ContactUs.new(params[:contact_us])

      # ::Pages::Mailer.delay.contact_us(@contact_us) # If I use this code, I will get an error with the 'full_name' attribute (read below for more information)
      ::Pages::Mailer.contact_us(@contact_us).deliver # If I use this code, it will work
    end
  end
end

All works, except when I use the ::Pages::Mailer.delay.contact_us(@contact_us) code with the method full_name related to the full_name class attribute in the email template (however, it works when in the email template I do not call the full_name method). That is, when I use the following email template with Dalayed Job I get an undefined method 'full_name\' for #<ContactUs:0x000001041638c0> \n/RAILS_ROOT/app/views/pages/mailer/contact_us.html.erb:

MESSAGE CONTENT:
<br /><br />

<%= @message_content.full_name %> # If I comment out this line it will work.
<br />
<%= @message_content.email %>
<br />
<%= @message_content.subject %>
<br />
<%= @message_content.message %>

When I use the above email template without Dalayed Job (that is, with the ::Pages::Mailer.contact_us(@contact_us).deliver code) it works.

The related mailer code is:

class Pages::Mailer < ActionMailer::Base
  default_url_options[:host] = <my_web_site_URL>
  default :from => "<my_email_address@provaider_name.com"

  def contact_us(message_content)
    @message_content = message_content

    mail(
      :to      => <my_email_address@provaider_name.com>,
      :subject => "Contact us"
    ) do |format|
      format.html
    end
  end
end

However, if I send a simple email (using the ::Pages::Mailer.delay.contact_us(@contact_us)) containing a @message_content.inspect instead of @message_content.full_name I get the following output (note that the full_name instance variable exists!) when I receive the email:

#<ContactUs:0x000001013fc378 @full_name="Sample name text", @email="sample@email_provider.com", @subject="Sample subject text", @message="Sample message text", @validation开发者_开发问答_context=nil, @errors={}> 

What is the problem with Dalayed Job and how can I solve that?

I really don't understand why this happens since I have full_name working as-like, for example, the email attribute for which all works. I also tried to restart my Apache2 server.

Unfortunately, DelayedJob doesn't allow attribute accessors in models. I learned that the hard way, after many, many hours of trying to get it to work. If you create a custom DelayedJob job, you would be able to create attributes specifically for that job's class.