Use Sequel timestamp plugin

[statianzo]

Save yourself the callbacks and use Sequel's Timestamp Plugin. It's one of many that come in the core.

# Timestamp all model instances using +created_at+ and +updated_at+
# (called before loading subclasses)
Sequel::Model.plugin :timestamps

# Timestamp Album instances, with custom column names
Album.plugin :timestamps, :create=>:created_on, :update=>:updated_on

# Timestamp Artist instances, forcing an overwrite of the create
# timestamp, and setting the update timestamp when creating
Album.plugin :timestamps, :force=>true, :update_on_create=>true