Installation:
1) install the gem
gem install sequel_validation_exceptions
2) specify the plugin in your sequel model
plugin :validation_exceptions

In a similar vein to the ActiveRecord ORM, this sequel plugin adds save!, update!, create!, and find_or_create! to the sequel model class. All of these methods will raise a Sequel::ValidationException if validation fails.

Examples:
account = Account.new :name => 'Mac'
account.save!

account.update! :name => 'Mac'

Account.create! :name => 'Mac'

Account.find_or_create! :name => 'Mac'