Question

I am using an special approach to deliver email.

First, I abstract the call of method for delivering email into a control method send_email
Second, I delayed the execution of the control method.

It seems to be fine to send some value that are hard-coded into the method for delivering email, but not the value passed into that method.

Control method:

  # this method is being delayed to control the time of sending email
  def send_email

    # approach 1 : just send a email after method send_email is executed 
    # In delay situtation : after 2 minutes
    # Otherwise : no delay
    Notifier.create_long_task(1234).deliver

    # approach 2: explicitly states to delay sending email process 
    # (same result with the above one)
    # 
    # Notifier.delay.create_long_task(1234)
  end

  handle_asynchronously :send_email, :run_at => Proc.new { 2.minutes.from_now }

In the above codes, I passed 1234 into delivering method and below the delivering method will assign 1234 to an instance variable @id

 def create_long_task(longTask_id)
    @greeting = "Hi"
    @longTask ="delay setting"
    @id = longTask_id

    mail to: "[e-mail]", :subject => 'Long Task Created'
  end

The email template looks like :

    Notifier#create_long_task
    Instance variable 1 : <%= @greeting %>
    Instance variable 2 : <%= @longTask %>
    Instance Id : <%= @id %>
    You created a long task 

So to be optimistic, the email will show 3 instance variables, 2 are hard-coded in the delivering method, one is passed into delivering method from outside

But the results only can show 2 instance variables that are hard-coded in the delivering method.

Notifier#create_long_task
Instance variable 1 : Hi
Instance variable 2 : delay setting
Instance Id : 
You created a long task 

It is very strange.
When I comment out handle_asynchronously to send the email without any delay, I can see all the instance variables. So I think that 1234 cannot be passed into delivering method.
Result of no delay email just like:

Notifier#create_long_task
Instance variable 1 : Hi
Instance variable 2 : delay setting
Instance Id : 1234
You created a long task 

This is a very long,complicated problem statement, I really appreciate if anyone can solve this problem.

Answer 1

Don’t forget to restart delayed job as it won’t pick up changes to your code until you do.