Engineering-TIL, knowledge snacks from Nodalview's front : June 2022

As mentioned in my previous article, we have a special channel at Nodalview where software engineers share little bits of knowledge from here and there which we believe will lighten up the day of the other team members. Knowledge is like food: there is a right amount of intake but there is always room for a small unplanned snack !

This channel is named "engineering-til", it stands for "Today I Learned", as a reference for the subreddit where some of us have spent way more time than we'd like to admit.

The rules are simple : one message per discovery, keep it small, share awareness but don't make it a book.

This is our monthly harvest for June, we hope you will enjoy it !

• Extensive article on multi tenancy architecture. Very complete?https://medium.com/@sudheer.sandu/multi-tenant-application-68c11cc68929
• https://developer.limneos.net iOS?runtime?headers,?you?can?instantiate?the?corresponding?classes?in?your?apps?after?manually?loading?the?bundle in?which?they?are?declared?in?(/System/Library/PrivateFrameworks/…) Check?out?Springboard?related?ones
• When performing a reverse-search in terminal (bck-i-search) which is done via ctrl+R, you may miss the command that you’re looking and you want to do instead a forward search to get back to it. Usually this is done via ctrl+S, but by default on Mac have another binding (dunno what ˉ\_(ツ)_/ˉ) on ctrl+S, therefore it’s not working. To enable forward search on ctrl+S, run?stty -ixon?in the terminal. To disable it again, run?stty ixon.
• ?Interesting article about code sharing in microservices.??https://link.medium.com/RvNjBomtvqb
• Removing?tmp/localstack?once in a while can avoid this problem:?https://github.com/localstack/localstack/issues/3855 Don’t forget to launch the scripts to re-create buckets and queues
• Quite interesting article on how we could handle statistics into the app.?https://evilmartians.com/chronicles/time-series-data-using-timescaledb-with-ruby-on-rails
• TIL that in Rails migration, index: true only works when you create a new table (create_table)?or add a reference (add_reference) but not when you add a column to an existing table (add_column(... , index: true) )
• Basic tutorial about using AlpineJS with Rails :?https://www.bootrails.com/blog/ruby-on-rails-alpinejs-tutorial/?AlpineJS seems to be a viable alternative to StimulusJS. The article also mentions?ViteJS?and the gem vite_rails , a tool that removes the need for jsbundling, Webpacker, importmaps and/or Sprockets.
• Extensive list articles on the use of GraphQL with Rails, a nd as a cherry the cake, a nice article about n+1

1. ?https://evilmartians.com/chronicles/graphql-on-rails-1-from-zero-to-the-first-query
2. ?https://evilmartians.com/chronicles/graphql-on-rails-2-updating-the-data
3. ?https://evilmartians.com/chronicles/graphql-on-rails-3-on-the-way-to-perfection
4. .https://evilmartians.com/chronicles/how-to-graphql-with-ruby-rails-active-record-and-no-n-plus-one

• An article about research over best practices on naming variables https://thenewstack.io/best-practices-for-naming-variables-what-the-research-shows/
• TIL about?Elegant Objects, a strongly-opiniated object-oriented programming paradigm that consider that most OO programing is not?real?OO. Here are some of the principles that it follows:

1. No null (why?)
2. No code in constructors (why?)
3. No getters and setters (why?)
4. No mutable objects (why?)
5. No readers, parsers, controllers, sorters, and so on (why?)
6. No static methods, not even private ones (why?)
7. No instanceof, type casting, or reflection (why?)
8. No public methods without a contract (interface) (why?)
9. No statements in test methods except assertThat (why?)
10. No ORM or ActiveRecord (why??and?why?)
11. No implementation inheritance (why??and?why?)

The author even created his?own programming language?that strictly follows these principles. You probably won't agree with all of them, but I find it interesting?to hear a very passionate person telling hot takes

• Very interesting articles on how the locks works with?postgres. What can go wrong with them. Plus some heads up to prevent locked db.?https://medium.com/compass-true-north/postgresql-lessons-we-learned-the-hard-way-663ddf666e4
• Today I lost a crazy amount of time using?.size()?in a test.I was waiting for 10 items and somehow it returned always 8 and I couldn't understand why. After extensive search in the interactor, record scoping, authorisations, ... I noticed that I went too fast and I wrote 2 times?.size()?and the size() method in Fixnum returns the number of bytes in the machine representation of a Fixnum which is 8 bytes for small number
• A little bit of charity for my fellow macbook users :?https://middleclick.app/
• For those who want to have x86 emulation on their M1 Macbooks you can use?https://mac.getutm.app/?(which uses QEMU underneath). I think it’s easier than setting a cross-compilation environment, for example
• How to keep a git history clean and ignore bulk update :?https://www.moxio.com/blog/43/ignoring-bulk-change-commits-with-git-blame
• Sidekiq 6.5 is out, here is the roadmap to Sidekiq 7.0 :?https://www.mikeperham.com/2022/06/17/coming-soon-in-sidekiq-2022-edition/
• Scaling Rails web sockets in Kubernetes with AnyCable
• Guide to Rails 7 and the Asset Pipeline
• Nice article?that explain some hows and whys in Ruby. Not super advanced but still good refresher?https://pabloadell.medium.com/ruby-cool-kid-rb-meta-programming-series-like-object-like-class-ruby-ancestors-ii-55f4da93dbb2
• TIL GitHub has achievements
• Your github contributions in a skyline and with cool background music https://skyline.github.com/YOUR_GITHUB_NICKNAME_HERE/2021
• Love the jetbrains diff panel ? You can have it as an OSS :?Meld. And it?integrates?with VSCode
• I love this tweet and the thread that follows about perspective on life. I can definitely see myself in some of them. https://twitter.com/FIMindset__/status/1542106871334666240

See you next month for the next episode !