Exactly. I was hired on as a Principal Engineer at a Rails shop despite having literally about 3 hours of experience using Rails. But, I'd worked with the rest of the senior technical staff before and they knew that just didn't matter. Sure enough, a couple months later I was submitting patches to the framework.
The other thing about new technologies in general, and Rails in particular, is that 2 or 3 years of experience doesn't really mean much because the evolution is so fast. There's lots of Rails lore out there on the web which is completely out of date, and if you're not willing and able to dive into the code yourself and design your own experiments you're going to make completely incorrect decisions about how to design your app and write your code.
The other thing about new technologies in general, and Rails in particular, is that 2 or 3 years of experience doesn't really mean much because the evolution is so fast. There's lots of Rails lore out there on the web which is completely out of date, and if you're not willing and able to dive into the code yourself and design your own experiments you're going to make completely incorrect decisions about how to design your app and write your code.