The current Early Release iteration covers Rails 3, and the authors are working to update it for Rails 3.1.
We expect to update the Early Release with 3.1 material in late October or early November and to release another update to the Early Release in December. The final book is currently due to be released in March 2012.
Thank you for writing us.
I purchased the Early Release ebook of Learning Rails 3 today (19th December) as part of a daily deal offer, but was quite disappointed to see upon flicking through that it only covers Rails 3.0.
Don't know how relevant this is in regard to the introductory nature of the first 10 chapters (the remainder not having even been updated to 3.0 yet), but I'm now hesitant to get stuck into this given that the two scheduled updates to 3.1 mentioned by Rachel above seem to have been and gone.
If anyone can give me a pointer on whether it's safe to at least tackle the first 10 chapters without running up against any conflicts with 3.1, that'd be really helpful.
I'm sorry for the disappointment, but I have some good news. It took longer than planned, but the author just finished up an update to the early release to update the contents for Rails 3.1. You can now download the updated ebook at https://members.oreilly.com/account/emedia.
Here's a note from the update:
This Early Release includes Chapters 1 through 9 updated for Rails 3.1.x. Additional chapters will follow, as will continuing updates for new versions of Rails. Chapters that haven't yet been updated yet start with a warning indicating that there is more work to do. If you find glitches or have further suggestions, please let me know at email@example.com.