I have a database of books that includes ISBN numbers. On Worldcat's
website, it is really easy to get a URL for a book if you have the ISBN
number. For instance, http://www.worldcat.org/isbn/0151327653.
I would like to be able to take the ISBN number from my database and put
it into a link in the record view. I know how to use link_to to link to
external sites, and to generate links to actions in the database, but
how can I make a link to an external site that includes data from my
All help is greatly appreciated!