I'm the Ruby Developer Advocate for GCP. I've used App Engine Flex with Rails 5 on a couple projects recently. Nothing huge but one is in production (it is for a local non-profit). I've found it to be a great way to get things out the door quickly and I love the auto-scaling.
It doesn't have all the magic of App Engine Standard and deploy times are slower than I'd like (~5 minutes). But I'm okay with that if I can use my own database, any library I want, and I have full portability.
It doesn't have all the magic of App Engine Standard and deploy times are slower than I'd like (~5 minutes). But I'm okay with that if I can use my own database, any library I want, and I have full portability.
I did a blog post with some of the stuff that I learned: http://www.thagomizer.com/blog/2017/03/09/rails-on-app-engin...