migration fails on heroku due to activeadmin mailer

Question

I am deploying an app to heroku and the app is on rails 3.2 and I have active admin gem installed.

When I run rake db:migrate it fails due to the following error

    ==  DeviseCreateAdminUsers: migrating =========================================
-- create_table(:admin_users)
   -> 0.0823s

Sent mail to admin@example.com (3228ms)
rake aborted!
An error has occurred, this and all later migrations canceled:

Connection refused - connect(2)

Wondering what I need to do to fix this. It seems that the Devise gem or ActiveAdmin needs to send mail during the migration process and because it can't if fails.

Answer 1

Try installing the Sendgrid addon:

heroku addons:add sendgrid:starter

If you are deploying to the Aspen or Bamboo stacks, it should work right away. If you are using the Cedar stack, you need to add an additional initializer:

#config/initializers/mail.rb

ActionMailer::Base.smtp_settings = {
  :address        => 'smtp.sendgrid.net',
  :port           => '587',
  :authentication => :plain,
  :user_name      => ENV['SENDGRID_USERNAME'],
  :password       => ENV['SENDGRID_PASSWORD'],
  :domain         => 'heroku.com'
}
ActionMailer::Base.delivery_method = :smtp

Taken from: http://devcenter.heroku.com/articles/sendgrid

Answer 2

This is confusing me a little:

Connection refused - connect(2)

Do you have your mail setup? Are you using SendGrid or similar? Remember that Heroku don't provide email services directly.

http://devcenter.heroku.com/articles/smtp