I have a guestlist page which lists tickets and a user can attache a
guest to each ticket by using an auto complete form.
If each ticket has a guest attached, then the guestlist is 'full'
I have this rule in my controller and I want to turn it into a
validation in the model. Any ideas?
if Ticket.find(first, condition => guestlist_id = ? and guest_id IS
display 'guestlist is full'
Thanks for your help