gistfile1.rb

# fix routes - this should only run once
Course.all.each_with_index do |c,ind|
  fixhash = c.routes.map{|x| {x.originalid => x.id}}.reduce(:merge) || {}
  routes = c.routes
  routes.each do |r|
    r.ancestors = r.ancestors.map{|x| (fixhash[x] == nil) ? (x.to_s.length < 22 ? x : nil ) : fixhash[x]}.compact
    r.save
  end
end