An approach to handle nested Maybe or Either.

Polymorphic association in database is when you have multiple tables that need to refer to the same table. For example, I have table users that contains details like profile information. I then have two tables, guards and operators which both have profile information. I

Pipe operator in Elixir is great, you can compose your functions naturally. However, there are times when you want to pipe the input to the second argument. How would you do that? Desugar iex> sum_number = fn x, y -> x -

With Ecto 2.0, there is support for Postgres schema or multiple databases for MySQL. What I am trying to do here is to use Postgres schema to achieve multi-tenancy, and of course using Ecto. Disclaimer: This is mostly for my personal notes as

You can quickly build a multi-tenant site in Django with the help of this nifty package django-tenant-schemas. It works by assigning each tenant into its own database schema and having one public schema for anything that needs to be shared. It wraps Django's connection

Recently I had the need to create a homebrew external command to extend homebrew default behavior. My goal is to extend brew deps command by creating a new command brew deps-group. Executing the command will list all top-level packages in homebrew that is related

Finally had a chance to play around with Kaggle challenge, and bike sharing demand seems to be the easiest to tackle - no domain expertise required or atleast very minimal. This is going to be Part 1 where I'll go over how I apply

I was reading reading about convolution matrix which was brillianty explained by Colah. If you're looking for good blog to follow, you might want to add him into the list. One of the application of convolution matrix is image manipulation like applying filters to

I've been toying with OpenCV lately and surprisingly it is pretty easy to implement face-tracking using OpenCV. However, OpenCV documentation is a bit lacking especially with its Python binding. Installing OpenCV In OSX (yes, I've moved to OSX from Windows since I do a

Haven't post anything for the past couple of months. I just started moving all the contents to Ghost blogging platform. Previously, I was hosting my blog on Github pages, which means I have to use some sort of static generator and push the content

While trying to implement Solr indexer, I came across problem on how to actually normalize the date format according to Solr format. Surprisingly, this question was asked quite often in Stackoverflow. So, I decided to write a Solr plugin with the hope to solve

I was playing around with AngularJs recently and decided to integrate it with Rails. The goal is to have total separation between front-end and back-end. Back-end will act as a RESTful service that spits JSON. Both front-end and back-end will be served from different

As part of my objective to up my skills, I decided to check out all the hypes with Ruby on Rails. But... I'm running Windows and if you're not writing anything other than .Net languages, running Windows seems fine. For other thing it sucks

Recently, I get a chance working with Pagodabox while helping a friend with a client project. If you do not know about Pagodabox, you can go to their website to checkout. In short it is a cloud solution to deployment of web application. One

This time around, I had a little project with a friend which involved cryptography. So we decided to implement an AES-256 encryption/decryption. That is way above top secret (lol). I googled around looking for information and reading more on cryptography and found this

While learning the new asynchrony feature in C# 5.0, I was experimenting the difference between the previous method of achieving asynchrony using callback against the latest feature provided by C# by utilizing the async and await keyword. So what's the difference? This question

I was playing around with Google Code Jam practice question and was thinking of a smarter way to solve this question. The particular challenge I'm doing is Hedgemony problem. I ended up solving it with two solutions and I did performance benchmark for fun.

I am currently working to finish up Pocket Api wrapper for C#/.Net. In turned out that the Api returned list of articles/items in Json and the list is not in array form. It is actually a list of object. We will see

Windows Phone 8 has this new feature of opening an app (in this case my own app) by assigning Uri. It is useful when you are doing Oauth and need to supply the redirection uri. If you are using this new feature, then your

One of the thing that I learned while making my app is how to optimize call to the webservice returning XML (RSS feed and the like). There is one cool feature called ETag. Sometimes you need to know whether the RSS feed has changed,

My Forex News app (WP8) has been released. Yeay for that! Currently working on my next app. In the meantime, I am in the process of creating an API wrapper for Pocket/Read It Later for C#. Initially I implemented all the Oauth 2.