irb(main):001:0> Sequel::Model.raise_on_save_failure = false
=> false
irb(main):002:0> u = User.new(:email => "jack@gmail.com", :password => "test", :password_confirmation => "test")
=> #<User @values={:email=>"jack@gmail.com"}>
irb(main):003:0> u.save
 ~ SELECT COUNT(*) FROM `users` WHERE (`email` = 'jack@gmail.com') LIMIT 1
raise on save failure is true
Sequel::Error: unable to save record
	from /usr/local/lib/ruby/gems/1.8/gems/sequel-2.7.1/lib/sequel_model/record.rb:460:in `save_failure'
	from /usr/local/lib/ruby/gems/1.8/gems/sequel-2.7.1/lib/sequel_model/record.rb:190:in `save'
	from (irb):3
	from :0
irb(main):004:0>