rails date validation with age

In my rails application there's 开发者_如何学Ca signup form which includes a DOB field.

The user's age need not to be more than 18.How can i give validation for this one.

My dob format is mm/dd/yy

The syntax for this is pretty fun, you could do something like this:

old_enough = ("10/23/2000".to_date + 18.years) < Date.today

Turn your string into a date, add 18 years, and see if it is before or after today.

If you want to put this in a model validator, this railscast could be useful: http://railscasts.com/episodes/211-validations-in-rails-3

You can do the validation yourself. Convert the string to a date with to_date and check that it's less than 18.years.ago.

Put that check in a method in your user model, and have it call something like errors.add :dob, 'must be older than 18' if it fails.

Then at the top of your model call validates :dob_check