Rails create unique value for saving in database

Question

I mean not to check on saving is current value - unique.

How can I create value (for example in my model), check is it unique for my table. Anf id not than try to create new value maybe. And check the uniqueness again

Now I have the following code in my model:

  after_initialize :init

  def init
    self.some_field = rand(1..99_999_999).to_s
  end

Answer 1

You can use model callback like,

before_create :generate_some_field

def generate_some_field
  self.some_field = loop do
    random = rand(1..99_999_999).to_s
    break random unless ModelName.exists?(some_field: random)
  end
end