factories.rb

FactoryGirl.define do
  factory :order do
	  email 'some@email.com'
	  delivery_fee 6.99
	  amount 206.99
	  paid 0
	  comments 'This is some comment to order'
	  discount_client 5

	  association :delivery
	  association :payment
	  association :shop
	  association :user
  end
end

order.rb

class Order < ActiveRecord::Base
  belongs_to  :shop
  belongs_to  :user
  belongs_to  :delivery
  belongs_to  :payment
  
  has_many    :order_items

  validates   :shop_id,                   :presence => true,
                                          :numericality => { :only_integer => true }

  validates   :user_id,                   :presence => true,
                                          :numericality => { :only_integer => true }

  validates   :deleted_at,                :timeliness => { :after => :created_at, :allow_blank => true }

  validates   :delivery_fee,              :presence => true,
                                          :format => { :with => /^[\d]{1,10}(\.\d{1,2})?$/},
                                          :numericality => { :greater_than_or_equal_to => 0, :only_integer => false }

  validates   :delivery_id,               :presence => true,
                                          :numericality => { :only_integer => true }

  validates   :discount_value,            :allow_nil => true,
                                          :format => { :with => /^[\d]{1,10}(\.\d{1,2})?$/},
                                          :numericality => { :greater_than_or_equal_to => 0, :only_integer => false }

  validates   :discount_percent,          :allow_nil => true,
                                          :numericality => { :greater_than_or_equal_to => 0, :less_than_or_equal_to => 100, :only_integer => false,  }

  validates   :discount_client,           :allow_nil => true,
                                          :numericality => { :greater_than_or_equal_to => 0, :less_than_or_equal_to => 100, :only_integer => false }

  validates   :discount_name,             :allow_blank => true,
                                          :length => { :minimum => 3, :maximum => 255 }

  validates   :payment_id,                :presence => true,
                                          :numericality => { :only_integer => true }

  validates   :paid,                      :allow_nil => true,
                                          :format => { :with => /^[\d]{1,10}(\.\d{1,2})?$/},
                                          :numericality => { :greater_than_or_equal_to => 0, :only_integer => false }

  validates   :email,                     :presence => true,
                                          :email => true
end

test.rb

describe Order do
	subject { build :order }

	it { should be_valid }

	describe '.undeleted' do
		it 'should return all order that have deleted_at set to nil' do
			create :order
			build(:order).errors.should == ""
		end
	end
end