I think I expressed myself in a confusing manner.
I write _SQL_ for migrations and nothing else. What I meant was that in order to _run_ the migrations it's enough to have a simple bash script of a few lines (which basically calls psql, ls and feeds the sql migration files in order).
I don't use jsonb with migrations. My migration files look like
In response to "Elimination of boilerplate to load data from a table into a type"
Unrelatedly to migrations, when working with postgres, I use postgres'json capabilites to get nice nested structures that I can convert to any other language easily (or even send it to the browser if serving a webpage). Instead of using tabular responses, I get json structures _directly_ from postgresql.
Very often I just write SQL queries that return a single row with a single json/jsonb field that has the whole JSON response to be served to a web endpoint. Basically I write most if not all my webservice in SQL. And I just have a very thin layer of a server language to work as a proxy between a frontend application and my database application (written in SQL).
1) I'm querying JSONb for that from postgresql and then the conversion to Ruby types is trivial.
2) Parameterized queries and you don't have SQL injection
3) The migration tool is a script of a few lines (bash in my case). It has a "migrations" table, it reads a list of migration files in a migration dir, check which ones don't exist in the migrations table and runs them in order. A migration file is just a .sql file
My whole setup is a few lines of code. A very small library covering the first two, a small script for the third one.
It's also possible to go to a cheap country to build hours on your bill and getting there faster. In Argentina you could get a wet hour of a Cessna 150 for $50. 1500 hours is 75Kusd. In two o three years you could be there
I'm in the process of switching careers _again_. I come from a different background and I moved to Software development ~10 years ago. I'm a skydiving instructor and also a commercial pilot and trying to find out which kind of pilot I want to be (avoiding the airlines, looking for bush flying, firefighting, etc). Life is too much fun to have only one career