device.rb

class Device < ActiveRecord::Base
  has_many :reminders
  
  acts_as_pushable :token
  
  def self.send_reminders
    last_push = Settings.last_push || Time.at(0)
    Settings.last_push = Time.now
    
    schedules = Schedule.all :conditions => ['schedules.time >= ?', last_push], :include => { :reminder => :device }
    
    schedules.each do |schedule|
      schedule.reminder.device.send_notification(
        :alert => 'You have a new Reminder waiting to be viewed!',
        :sound => true,
        :custom => {
          :reminder_id => schedule.reminder.id
        }
      )
    end
  end
end