I have a simple problem, related to associations. I have a model for book, that has_one reservation. Reservation belongs_to book.
I want to make sure in the create method of reservations controller that a book is not reserved already when a reservation is made. In other words, I need to check if any other reservation exists for that book. How do i do that?
EDIT: Aaaand i made it, thanks everyone for the tips, learned some new stuff. When i tried offered solutions, I got no_method errors, or nil_class etc. That got me thinking, that the objects I'm trying to work on simply don't exist. Krule gave me the idea to use book.find, so i tried working with that. Ultimately i got it working with:
book=Book.find_by_id(reservation_params[:book_id])
unless book.is_reserved?
Thanks everybody for your anwsers, I know it's basic stuff but i learned a lot. Cheers!
How about:
self.reservation.present?
This should return true if an association exists.