如何为 model 设置随机数 before_save？

Question

I have a Produt model, that if the user left blank, I need to generate a random number. How can I achieve that?

  def self.set_random_number()
   if self.code == null
    self.code.rand(1000..99999)
   end
  end

I tried this method, and called before_save:set_random_number(). But it doesn't work. Could you guys please help me?

Answer 1

You're not assigning the randon number in the model, change your method to this:

before_save :set_random_number

def set_random_number
 self.code = rand(1000..99999) if self.code.blank?
end

Answer 2

Try the below:

before_save :set_random_number

def set_random_number
  return if code.present?

  self.code = rand(1000..99999)
end