rails loop

rails 用户添加session使用loop循环
models/user.rb

before_create :generate_authentication_tokendef generate_authentication_token    loop do      self.authentication_token = SecureRandom.base64(64)      break if !User.find_by(authentication_token: authentication_token)    end  end

订单号的产生
models/order.rb

before_create :save_order_number def save_order_number    loop do      self.order_number = "EZC"+Time.now.strftime('%Y%m%d')+rand(100000).to_s      break if !Order.find_by(order_number: order_number)    end  end