Apply arbitrary changes to a bunch of ActiveRecord entities

change_ar_records.rb

changes = {
  "Boooking:234" => lambda { |record| record.some_attribute = "new_value" }
}

changes.each do |model_class_and_id, change|
  begin
    klass = model_class_and_id.split(":").first.constantize
    id    = model_class_and_id.split(":").last.to_i

    print "== Changing #{klass} '#{id}' ... "

    record = klass.find(id)
    change.call(record)
    print "Changes were: #{record.changes.inspect} "
    if ENV["SAVE"]
      record.save(false)
      print "[DONE]"
    end
  rescue => e
    print "[FAILED] (#{e.message})"
  end

  puts
end