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Careful when using mutable types as default arguments in Python

Powerful Google Visualizations for Ruby on Rails

Partitioned Graph Coloring

What is Linear Programming

Making a thesis 2.0

Whenever one of our team member travels to another country we tell her to track expenses like food, transportation and accomodation so that later that money can be refunded. Each of us does it in a different way: we write it in a notes application...

Install the RMagick gem in the painless way with Homebrew

Quick way to test many values in ruby

On the previous post I wrote a few lines on the basic usage of the accepts_nested_attributes_for method in rails models. I strongly recommend reading that post before this one if you haven’t. Although there is a standard way for deleting items, there...

Rails makes it easy to build HTML forms associated to a certain model. Simply using the form_for instruction on the view, writing a simple update method in the controller and setting validation logic on the model, makes standard CRUD operations incredibly...