Random Mailer Failures

[Orlovic982]

Sending the confirmation mailer in my Rails app sometimes fails randomly without raising any exception. I discover it only when I visit the dashboard, and I see the following error:

Type: ActionView::MissingTemplate
Message: Missing template user_mailer/confirmation_instructions with "mailer". Searched in: * user_mailer.

It doenst do it regulary, only sometime. However, when I retry the job, it executes without any problem.

I’m simply using:

UserMailer.confirmation_instructions(@user).deliver_later
And:
ActionMailer::MailDeliveryJob.rescue_from(Exception) do |exception|
Rails.error.report(exception)
raise exception
end

This doesn’t raise any error in my logs, or exception that will sent to my Mail. The failure seems completely random, and I only notice it when checking Mission Control.

I know Solid Queue doesn’t have any automatic retry mechanism, but since this is a critical system feature in my app, I need a way to automatically retry or re-send the mailer job when it fails.

[Orlovic982]

Although I call the deliver_later method, the job’s arguments are set as:
Arguments:
UserMailer, confirmation_instructions, deliver_now, { args: [gid://.../User/bc44f55d-a73b-4e11-91e3-76329553623d] }

[calvinchieng]

@Orlovic982 I notice the same error pattern in my application a while ago.

Missing template contact_mailer/send_contact with "mailer". Searched in: * "contact_mailer"

I think it might be not be a Solid Queue issue, could be Rails.
Because that application I have not migrate to Solid Queue, I am using Delayed Job.

I have not found a fix so far. It happens like just ~2 times in the entire day.
I just rely on Delayed Job's retry feature to resend at the moment.