validation for at least one record in database

I don't want user to delete all entries in database. There should be at
least one always present. How can I put this validation in model?

I don't want user to delete all entries in database. There should be at
least one always present. How can I put this validation in model?

Something like this will stop the last record being deleted.

class Model < ActiveRecord::Base
  before_destroy :ok_to_delete_last_record?

  private

    def ok_to_delete_last_record?
      self.class.count > 1
    end

end

Cheers,
Jordan

AWDwRoR catches it with this in the applicable model:

def after_destroy
  if User.count.zero?
    raise "Can't delete last user"
  end
end

It seems like it would already have deleted the record (since it's
after_destroy), but it will still be there and raise the error before
the data goes away.

-Kyle