nested_attributes and many_to_one relationship validation

nested_attributes_many_to_one_validation.rb

require 'sequel'
require 'sqlite3'
require 'logger'

DB = Sequel.sqlite
# DB.loggers << Logger.new($stdout)

Sequel::Model.plugin :validation_helpers
Sequel::Model.raise_on_save_failure = false

DB.instance_eval do
  create_table :orders do
    primary_key :id
    Integer :quantity
    Integer :price_in_cents
    foreign_key :shopper_id, :shoppers
  end

  create_table :shoppers do
    primary_key :id
    String :email
  end
end

class Order < Sequel::Model
  many_to_one :shopper

  plugin :nested_attributes
  nested_attributes :shopper

  def validate
    super
    validates_presence [:quantity, :price_in_cents]
  end
end

class Shopper < Sequel::Model
  one_to_many :orders

  def validate
    super
    validates_presence :email
  end
end

o = Order.new(quantity: 1, price_in_cents: 100_00, shopper_attributes:
  { email: '[email protected]' })
o.save

o2 = Order.new(quantity: 1, price_in_cents: 100_00)
o2.save
puts o2.errors

o3 = Order.new
o3.save
puts o3.errors