Code along with http://devblog.avdi.org/2015/05/26/rubytapas-freebie-sequel/ (usage: get https://rubygems.org/gems/bundle-try, then: `bundle try rubytapas-sequel@https://gist.github.com/eval/4db895457e8b25c31037`)

rubytapas-sequel.gemspec

Gem::Specification.new do |s|
  s.name = 'rubytapas-sequel'
  s.description = 'Follow along with http://devblog.avdi.org/2015/05/26/rubytapas-freebie-sequel/'
  s.version = '0.0.1'
  s.require_path = '.'
  s.add_dependency "sequel"
  s.add_dependency "sqlite3"
end

rubytapas-sequel.rb

require "sequel"

DB = Sequel.sqlite

DB.create_table :people do
  primary_key :id
  String :name
end

DB.create_table :items do
  foreign_key :person_id, :people
  String  :name
  Integer :quantity, default: 1
  unique  [:person_id, :name]
end