Trying to use a sequel model without a table

sequel_model_without_a_table.rb

# in sequel/plugins/foo.rb
module Sequel::Plugin::Foo
  def self.apply(model)
    model.plugin :timestamps, :create => :created_on, :update => :updated_on
    model.plugin :validation_helpers
    model.many_to_one :user
  end

  module InstanceMethods
    # Note that it's probably a bad idea to override initialize unless you
    # really know what you are doing.
    def initialize(params={}) ... end

    # Make sure to call super inside these methods.
    def before_save ... end
    def after_create ... end
    def validate ... end
  end
end

class Bar1 < Sequel::Model(:bar1)
  plugin :foo
  ...
end

class Bar2 < Sequel::Model(:bar2)
  plugin :foo
  ...
end