John Deliyiannis

The Archive

Writing

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

23 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. Rails World 2025

    A short note after Rails World 2025 on what I took from the conference, why Rails still feels practical and why I want to keep building with it.

    Rails 1 min read

  3. Sidekiq Restarts in Rails: Deployment Cautions

    Key precautions to protect your background jobs and ensure a smooth application update.

    Rails 2 min read

  4. Chess opening drills project

    Master chess openings with a drill plaform, designed for enthusiasts to practice and hone their skills. Upload custom PGNs, convert them into chess opening trees, and challenge yourself against a computerized opponent. Tailored for personal use, it's an MVP solution to a common chess challenge. Dive in and share your feedback!

    Rails 2 min read

  5. 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

  6. Strange bugs

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

    Rails 4 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. Most jobs based on backend framework

    Most famous web framework

    Rails 3 min read

  10. Ember, ember-cli and its future

    My point of view regarding ember at the current stage

    Javascript 3 min read

  11. Freeze - A rails rss reader

    My way of bookmarking things on the internet.

    Javascript 1 min read

  12. Simple web chat with node.js and websockets

    I've written a simple realtime web chat just for fun with socket.io

    Javascript 1 min read

  13. acts-as-taggable-on gem, version 3.2.1 has a nasty bug

    Be careful if you are using acts-as-taggable-on gem

    Rails 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. A book for rails engines

    I took in my hands today my new book, crafting rails 4 applications

    Rails 3 min read

  18. Rails notifications for useful monitoring

    A simple and useful use of activesupport subscribe and notifications, for gathering and monitoring slow queries, slow views and many queries.

    Rails 2 min read

  19. Rails and node.js

    Is this really a battle for the best web development tool or something else?

    Nodejs 2 min read

  20. Cache is almost always the problem

    Remember to always clear cache when something is very strangely wrong

    Rails 1 min read