sms_sender_with_job.rb

commnunity.users.each do |recipient|
  # this chucks the job into a queue and returns immediately!
  # it no longer takes a while to finish.
  SmsSenderJob.perform_later recipient, community, 'Everything is fine.'
end

# Here's where you define the job that gets run by the workers
class SmsSenderJob < ApplicationJob
  def perform(recipient, community, message)
    sms_credits = community.sms_credits

    if sms_credits > 0
      send_sms recipient, message # this still takes a while.

      # take off a credit
      community.sms_credits = sms_credits - 1
      community.save
    end
  end
end