inspect failed resque jobs for particular errors

resque_error_inspector.rb

start = 0
max =  Resque.redis.llen(:failed).to_i
count = 100
errors = []
while start < max
  Resque.list_range(:failed, start, count).each do |e|
    errors << e if e['payload']['args'].first == 'User'
  end
  start += count
end