Roundup: Database migrations, 40 years as a female programmer and the difference between validations and associations

How The Guardian migrated from MongoDB to PostgreSQL - Celia C

https://www.theguardian.com/info/2018/nov/30/bye-bye-mongo-hello-postgres

I've recently started learning about AWS, and have just taken an innovation day to get more familiar with databases. This article sort of ticks both those boxes, and though I don't understand all of it yet, I definitely understand way more than I would have two months ago

40 Years as a Female Programmer, and Still Going! - Celia C

https://codecalendar.dev/2019/40-years-as-a-female-programmer-and-still-going/

This is just great

Validations are behavior, associations are structure - Igor SF

http://blog.davidchelimsky.net/blog/2012/02/12/validations-are-behavior-associations-are-structure/ Sensible thoughts on what should and what should not be tested. Written by David Chelimsky, one of the RSpec developers. Very good read.