Elixir meets Docker.io

16 July 2016 ⋅ 4 min read ⋅ elixir docker

In usual conditions it’s preferable to deploy your Elixir / Erlang apps with exrm and a-la Capistrano derivatives like edeliver. There are cases when you either need to make it easily installable or handable to a client. In this rare cases packaging the app in the Docker image is worth the effort.

Cross-platform app links

23 May 2016 ⋅ 3 min read ⋅ android iOS titanium

Here are some notes after the recent research into deep linking into the apps. The goal was to launch the app on clicks on links in email. Traditionally, we were using a custom scheme to register the app as a handler for, but this didn’t work quite well. So notes:

Filtering ListView in NativeScript

1 April 2016 ⋅ 2 min read ⋅ nativescript

Quick tutorial on how to filter the ListView in NativeScript.

Dash docset for NativeScript

31 March 2016 ⋅ 1 min read ⋅ nativescript dash

If you are developer and using Mac, you must absolutely know offline documentation and snippets browser Dash by now. If not, go check it out. It will change your life.

This morning I submitted my own docset for NativeScript 1.7.1. It’s been accepted later today and can be found in Preferences -> Downloads -> User Contributed. Search for “NativeScript”.

I’m planning on adding How-to’s and guides from the official documentation site in it in the upcoming release.

Chat rooms app in Elixir in 15 minutes

18 December 2014 ⋅ 7 min read ⋅ elixir phoenix websockets

This is the showcase post that touches a tiny part of what Elixir and the accompanying tooling can help you build in very little time.

Bare bones files watch

8 December 2014 ⋅ 2 min read ⋅ shell

Sometimes I just need to follow the changes to files and act upon that. There are plenty of “watchers” out there, like Guard and Watchr, but if I really don’t want to drag the bag of gems, here’s what I do…

YAML you may have never known

23 October 2014 ⋅ 1 min read ⋅ yaml rails

The collection of cool things you can do in YAML.

My current Elixir toolkit

19 October 2014 ⋅ 2 min read ⋅ elixir

All my free time I’m spending on a my own project that I decided to write in Elixir, Rails and CoffeeScript. There is the service backend that runs heavily multi-threaded and so Elixir / Erlang was a natural choice.

Completes and totals, or how to count

14 October 2014 ⋅ 1 min read ⋅ sql

In every third project I see SQL like this:

SELECT
  (SELECT COUNT(*)
   FROM table
   WHERE group_id = X AND completed = 1) as completed,

  (SELECT COUNT(*)
   FROM table
   WHERE group_id = X) as total

FROM table
WHERE group_id = X
GROUP BY group_id

As you might understand the intention is to count all records in the group and those with completed flag set. This solution gives me creeps.

Here’s how I would write the same:

SELECT
  COUNT(NULLIF(completed, 0)) as completed,
  COUNT(*) as total
FROM table
WHERE group_id = X

Now pick your DB book and go read what NULLIF function is, and do me a favor. No more crazy subselects, ok?

Appcelerator Titanium: Scaling and cropping images

29 September 2014 ⋅ 2 min read ⋅ titanium

At the time of writing Titanium is at: 3.3.0 GA

In the project I’m supporting we juggle with camera shots like crazy. One of the recent requests from the client was to show square thumbnails in the list of taken pictures. While the requirement itself is pretty reasonable, Titanium doesn’t make our life easier.