Hi guys, I have two classes, library and book. library has_many :books. When I want to add a book to a library, I call library.books << book. So far so good. However, before I add the book, I need to check whether it's already in the library. I thought I would do this by adding 'unless library.books.find(book)', but this doesn't work because if find() doesn't find anything it seems to throw an exception rather than returning nil. Can anyone tell me how I can check whether the book is already in the library? Thanks! David.
on 2005-12-17 17:42
on 2005-12-17 17:48
Sorry guys, I am a fool ;) find(:first) returns nil instead of throwing an exception when nothing is found.