Ruby on Rails email scheduling using runner and cron

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Problem
You want to send emails from a Ruby on Rails application, when there is a specific condition on a database table. If the database table gets modified by another application outside Rails you cannot use an observer model.

Solution
We already assume that:

  • You are using a database
  • You have a model named voicemail (id, number_id, audio, created_at, updated_at)
  • You have a model named number (id, voicemail_email_set, voicemail_email, ….)
  • A mail server to use (smtp in our case)
  • Another application (voice application) populates the voicemail table but with empty updated_at values

So the steps we have to follow are:

  1. Change the settings in your config/environment.rb file to use the settings for your mail server, and make sure you restart your application after the changes:
  2. Create your mailer model (ie voicemail_mailer.rb), in app/models:
  3. Create your email scheduler in file lib/email_scheduler.rb: