On the other hand, throughout the book there are lots of little tidbits and functions of Rails that I did appreciate learning and will use in the future. The poor organisation makes this a book to read with a notebook or sticky notes at hand to keep track of things that interest you. And the section of creating custom responders in particular was an interest addition that I'd quite like to try for cleaning up code.
The book suggested layering custom responders on top of custom renders as a powerful way of tidying things up. That might have been the aim in tying things together but I think for most development shops that would lead to entirely too much magic and the code becoming quite opaque to less experienced developers. Worthwhile if you're writing a plugin that needs the powerful generic solution, but not something I want to see everyone using.
One particularly useful bit of coverage is Rails engines, they aren't covered in any section in a particularly focused fashion but are used a lot and the demonstration 'Enginex' gem helps with creating them. If you've been wanting to work with engines this is probably the best overview of them that has been published so far, although that is perhaps more of an indictment of current resources than anything else, hopefully some of the upcoming rails books will deal with them more explicitly.
Is it worth reading? Yes, but there are a lot of other books that you should definitely have read first before this gets to the top of the reading pile. If you're doing a lot of work with plugins or gems, or one of the chapter headings jumps out at you as something you need to do soon, then pick it up with haste. But if it's just on your reading list out of interest then in the Ruby world Metaprogramming Ruby is a more important "advanced" book and I'd also suggest reading more broadly in related technologies before hitting this book.
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