I'm a PHP developer, but Ruby is one of the languages that I started with a couple years back. The Rails Tutorial by Michael Hartl is highly recommended back then. I learned a lot from that book that is still valuable even when I'm on a different ecosystem now. Though it's quite geared towards beginners... but it wouldn't hurt to check it out.
Michael Hartl's work is so popular that it's practically the canonical source of Rails. Like, even if it's beginner material, it's worth skimming if only to know what other folks are being taught.
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