Rails - Dec 2005 - find() and has_many

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.

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Posted via http://www.ruby-forum.com/.

Sorry guys, I am a fool ;)

find(:first) returns nil instead of throwing an exception when nothing 
is found.


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