Rake Task for Errbit: clear problems older than 7 days

crontab

30 4 * * * /bin/bash -l -c 'RAILS_ENV=production cd /home/errbit/current && rvm 2.2.1 do bundle exec rake custom:delete_old_problems >> log/clear_old_problems.log 2>> log/clear_old_problems.log'

custom.rake

namespace :custom do
  desc "Clear problems older than 7 days"
  task delete_old_problems: :environment do
    total_count = count = Problem.where(:created_at.lt => 7.days.ago).count
    total_removed_count = 0
    puts "Problems to remove: #{total_count}"
    while count > 0 do
      problems = Problem.where(:created_at.lt => 7.days.ago).take(10)
      start = Time.now
      removed_count = ProblemDestroy.execute(problems)
      total_removed_count += removed_count
      puts "Removed #{total_removed_count} / #{total_count} problems (#{ (Time.now - start).to_i } seconds)"
      count -= removed_count
    end
    puts 'All done!'
  end
end