As a ruby developer I may not be that well qualified to ask about this but can you give me an example where you've had this difficulty? It would be good to know in case there's some low-hanging fruit in documentation that would make new ruby/rails developers lives easier.

I tend to have a very easy time finding the documentation I need, in both ruby and rails. Sometimes that means a google search, but if I want more fine-grained implementation details, I normally crack open the gem in question with `bundle open` and read the source. I know that a lot people from a Java background for example prefer code-completion in their IDE's to reading source, but it seems to be the most comfortable way to find what you're looking for, in ruby at least.