class AddPrevLastHbToAllMacInRedis < ActiveRecord::Migration[6.0]
  def self.up
    RouterInventory.all.each do |ri|
      last_hb = $redis.hget "AP:#{ri.mac_id}", "last_hb"
      $redis.hset "AP:#{ri.mac_id}", "prev_last_hb", last_hb
    end
  end
  def self.down
    RouterInventory.all.each do |ri|
      last_hb = $redis.hget "AP:#{ri.mac_id}", "last_hb"
      $redis.hset "AP:#{ri.mac_id}", "prev_last_hb",'' 
    end
  end
end