I am not sure this is the correct way to bump an old question (by answering it), but I'm giving it a shot.
This question was asked in late 2010 and, still, the SAME problem persists.
Ruby tagging is a mess. Everyone indiscriminately tag "ruby" and "ruby-on-rails" on almost every Rails question. Sometimes, even the other way around.
Most of the times, people won't bother about correctly tagging version-specific or version-indifferent questions. It's very common to see even experienced users to tag "ruby-on-rails", "ruby-on-rails-3" and "ruby" on a simple, version-unaware Rails question.
Tagging is clear in both Rails and Ruby tag wikis, but, apparently, no one reads it.
I've tried editing a few questions, correcting tags. But to no use. They just keep coming.
How can this be solved?
If this isn't the correct way of bumping an old question, please, tell me and I will delete this answer and do it properly!