DHH: Scaling to multiple DBs with Rails
loudthinking.com
loudthinking.com
To say "... extending Rails to do what you want is often much simpler than you think" is disingenuous at best.
Well, I bet that's true now.. Or will be..
But I can't imagine anyone not building or releasing a Web app until they have an inside-out understanding of the technology.
Assuming they have some means to monetize their traffic, they can now go hire someone to fix a problem most people wish they had.