I think I'm figuring out how use Sequel::Model....

learn_sequel_model_spec.rb

require "sequel"


# Use the module to avoid naming collisions with other specs.

module LearnSequelModelSpec
  describe "Person Model" do
    let(:db) { Sequel.sqlite }

    before(:each) do
      db.create_table :persons do
        primary_key :id
        String :name, null: false, unique: true
      end
    end

    context "round-trip" do
      example "happy path" do
        Person = Sequel::Model(db[:persons])

        Person.create(name: "J. B. Rainsberger")
        found = Person.find(name: "J. B. Rainsberger")
        expect(found.id).not_to be_nil
        expect(found.name).to eq("J. B. Rainsberger")
      end
    end

    context "mix in non-database behavior" do
      module PersonBehavior
        def length_of_name
          name.length
        end
      end

      example "happy path" do
        Person = Class.new(Sequel::Model(db[:persons])) do
          include PersonBehavior
        end

        Person.create(name: "J. B. Rainsberger")
        found = Person.find(name: "J. B. Rainsberger")
        expect(found.length_of_name).to eq(17)
      end
    end
  end
end

I really, really, really hate the name PersonBehavior here. I don't know what else to call it.