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Got an strange error:
 invalid value for Integer "09"
What did I do? (…)Integer(somestring)(…) where somestring was something between 01-99.
Turns out that an leading zero tells ruby that this is octal. Hell, I don’t have any octal stuff in my web app.
Solution: Do it the ruby way, use .to_i – even cleaner, and no octal nonsense [...]

In the java world, you have setter and getter in your model which are called ALWAYS. Change some behaviour in the setter/getter and you are done. Things are somewhat more complicated if we look at rails and activerecord.
Imagine you have a model that should parse both minutes and a formatted hour/minute string as data:
testcase.estimated_time = [...]

If you want to show _when_ the app has been deployed with capistrano, this snipped might come in handy:
#############################################################
#   Custom Tasks
#############################################################

set :version_file, "#{tcdb_path}/app/views/layouts/_version.html.erb"

namespace :my_tasks do
desc "Sets the timestamp in version_file"
task :set_version_info do
run "rm #{version_file}"
run "echo ‘#{Time.now}’ >> #{version_file}"
end
end

after ‘deploy:symlink’, ‘my_tasks:set_version_info’
One more thing… add this file to your layout (the footer is a good place [...]