No, but I do not use an IDE to write Rails code.

I can think of a few cases where Rails architecture would be relatively difficult for IDEs: ActiveRecord callbacks, and of course metaprogramming and magic methods like "find_by_x".

In most cases this sounds like a mismatch between IDE and framework, but the "method_missing" chain could be a unique challenge.

I avoid using that construct in application code, and just accept that some of it exists in the framework -- but that it's almost certainly not the cause of any problem I'm debugging.

But sometimes it is. As an example, I've been trying to track down the code that runs for uncaught exception in a controller. It's (probably) somewhere in ActiveController but there's no easy way to find it.