John Deliyiannis

The Archive

Writing

A running archive of things I learn, build, question and occasionally change my mind about.

19 entries · 12 topics

  1. Building DCAloop, an automated Bitcoin DCA app

    Notes on building DCAloop, a Rails app for automated Bitcoin DCA on Binance with restricted API keys, execution history and simulations.

    Rails 5 min read

  2. Unraveling the Mysteries of where.not in Rails

    Unraveling the subtle differences between combined and separated where.not clauses in Rails. How a small difference can lead to significant outcomes.

    Rails 2 min read

  3. Strange bugs

    I am describing two production error bugs that we recently encountered and the path to solve them

    Rails 4 min read

  4. Recipe for resize and combine images in ruby

    Compose two or more images in ruby

    Ruby 1 min read

  5. Ruby in reddit api

    Ruby way of communicating and using reddit through API

    Ruby 2 min read

  6. Quick ruby tip: Interview simple question

    We examine a simple question regarding ruby and how to write efficient code

    Ruby 1 min read

  7. My must-have ruby resources to keep yourself updated

    What I am doing to follow up the changes of ruby and ruby on rails

    Rails 3 min read

  8. Simple ruby parser

    A simple parser and how it works with faraday and nokogiri

    Rails 2 min read

  9. Crypto DCA with ruby in Binance and Kraken

    How can you automate the DCA with ruby to Binance and Kraken

    Ruby 2 min read

  10. Dollar cost average with ruby on historical data

    Dollar Cost Average vs Go all-in and Hold on historical data.

    Ruby 2 min read

  11. DB Backup with a simple ruby script

    A simple script for saving every week your db and storing it on S3 and on your email

    Ruby 1 min read

  12. Freeze - A rails rss reader

    My way of bookmarking things on the internet.

    Javascript 1 min read

  13. Simple site monitoring

    One really simple ruby script to check if your site is up or not

    Ruby 1 min read

  14. Strong parameters and arrays

    How should you handle the association ids with strong parameters?

    Rails 2 min read

  15. Uniqueness validation and rails

    Look out this default behavior of rails, before you do any really bad mistake and you have two same records.

    Rails 1 min read

  16. Automate sprite creation with compass

    A simple way for creating automatically sprites with compass. Guide for a rails 4+ app with assets pipeline

    Rails 3 min read

  17. RVM change automatically gemset per project

    One small and cool tip of how to automatically change your ruby version and your ruby gemset per folder / project.

    Ruby 1 min read

  18. League of Legends simple parser

    Parse a json, store the results in the database and display them.

    Ruby 2 min read

  19. Simple fql for idea evaluation

    How I managed to get many specific facebook pages using fql for doing some basic research.

    Ruby 4 min read