My past long posts about multi-threaded concurrency in Rails ActiveRecord are some of the most visited posts on this blog, so I guess I’ll add another one here; if you’re a “tl;dr” type, you should probably bail now, but past long posts have proven useful to people over the long-term, so here it is. I’m in the middle of updating my app that uses multi-threaded concurrency in unusual ways to Rails4
![ActiveRecord Concurrency in Rails4: Avoid leaked connections!](https://cdn-ak-scissors.b.st-hatena.com/image/square/8d71ff5111e05619a10d29bb40d7aebaa75c8fbc/height=288;version=1;width=512/https%3A%2F%2Fs0.wp.com%2Fi%2Fblank.jpg)