sms_sender_with_job_2.rb

commnunity.users.each do |recipient|
  sms_credits = community.sms_credits

  if sms_credits > 0
    # this chucks the job into a queue and returns immediately!
    SmsSenderJob.perform_later recipient, 'Everything is fine.'

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

class SmsSenderJob < ApplicationJob
  def perform(recipient, message)
    send_sms(recipient, message)
  end
end