trustieplus/db/migrate/20170427013052_sync_myshixun_count.rb

class SyncMyshixunCount < ActiveRecord::Migration
  def up
    shixuns = Shixun.all
    shixuns.each do |shixun|
      myshixun_count = shixun.myshixuns.count
      shixun.update_attribute(:myshixun_count, myshixun_count)
    end
  end

  def down
  end
end