@Norbert Thanks for the constructive answer! I'm glad you noticed that
there is no difference between using two-year-old PC and two-year-outdated
More seriously: changes between RoR2 and RoR3 were quite significant, so
buying a book about RoR2 internals to use it with Rails3 was rather a bad
idea. I'm trying to learn if it's the same in this case.
I suggest you weigh at the pros and cons. If you can wait for a couple of
months for the release of rails 4
and another or 2 for a good book, then I'd say wait. But in those months,
you could've already acquired a
good deal of knowledge when you buy a rails 3 book. There are some new
stuff going out in rails 4 like
turbolinks, doll caching and strong parameters, all of which are kind of an
upgrade to the version that rails
3 is using so you might want to look at how those work at the moment while
waiting for rails 4.