Open Source Rails 3.2 Example Apps and Tutorials

This is a website and GitHub repository for open source Ruby on Rails example apps and Rails tutorials.

It spans the gap between Ruby on Rails tutorials for beginners and the piecemeal advice found on experts’ blogs.

Here’s what you can do:

follow the Rails tutorials and examine the code to to see examples of complete working Rails 3.2 web applications
download code (“clone a repository”) to customize an app for your own use
use an application template to generate a ready-made starter app
modify an application template to make your own custom starter app

New to Rails? See a list of recommended resources for Rails.

Eldarion is built on open source and its team members are core developers of a range of open source projects including Python, Django, Pinax and many individual Django apps.
Wherever possible, we open source components of our web sites and love working with clients that allow us to open source parts of our work for them.
Here are some of our open source reusable Django apps that have come out of our site development work:

Hacker News
This tiny script is a scraper for http://news.ycombinator.com. It shows just how little Ruby is required to run a powerful web filter.

What it be doin':
Fetches the YCombinator news page
HPricot's it into pieces
Builds an RSS feed
Uses links to parse the destination article page and include the main text inline
Runs as a stand-alone server thanks to Rack and Mongrel

When I first wrote this blog my intention was to introduce you to a class ThreadLocalRandom which is new in Java 7 to generate random numbers. I have analyzed the performance of ThreadLocalRandom in a series of micro-benchmarks to find out how it performs in a single threaded environment. The results were relatively surprising: although the code is very similar, ThreadLocalRandom is twice as fast as Math.random()! The results drew my interest and I decided to investigate this a little further. I have documented my anlysis process. It is an examplary introduction into analysis steps, technologies and some of the JVM diagnostic tools required to understand differences in the performance of small code segments. Some experience with the described toolset and technologies will enable you to write faster Java code for your specific Hotspot target environment.

This guide aims to show examples of the most useful Python Library functions, methods, and classes. At this point, only the more widely used modules were added. Python version 2.5 was used for the examples unless noted otherwise. An example of output of a function will be shown in the form of function_call(args) # result, when the result is the actual output, it is shown after the comment sign, if it’s a description of an outcome, e.g. a raised exception, it will be shown in square brackets:

SPOJ – Sphere Online Judge – is a problemset archive, online judge and contest hosting service accepting solutions in many languages.

There are several sites on the web which contain problems to be solved in various programming languages. Some are helpful for newcomers just learning the language, others are challenging for experienced programmers. Some are useful for practice before programming contests. Here is a list of some of these sites (please add more that you are aware of), along with sub-pages for solutions in python (multiple alternative solutions welcome) and commentary on approaches to the problems, ways to leverage Python and/or the standard library to solve problems, ways in which the problem changes depending on the language you use to solve it, etc.

This guide will show you how to build a variety of apps in Django 1.2. (Nearly all of the code will work on Django 1.1, as well.)

8/2/10: New tutorial added: Calendar App.

The Python Module of the Week series, or PyMOTW, is a tour of the Python standard library through short examples. This is version 1.132, last updated Jul 08, 2011 to cover the ConfigParser module.

great list of things you can do in K, more than 1000+ !

A number is prime if it is only divisible by 1 and itself. So for example 2, 3, 5, 79, 311 and 1931 are all prime, while 21 is not prime because it is divisible by 3 and 7. To find if a number n is prime we could simply check if it divides any numbers below it. We can use the modulus (%) operator to check for divisibility:

Born in Dallas, TX in December, 1989. I'm living in Turkey and studying Computer Engineering as 3rd year student at Bilkent University. My interest areas are web backend development, infrastructure scalability, mobile application development and I'm enthusiastic about cloud computing, NoSQL databases and user experience. I am blogging in Turkish for 6 years.

Of course, a big problem with most corners of the internet is labeling. One of our most consistently frustrating issues is trying to figure out whether two ticket listings are for the same real-life event (that is, without enlisting the help of our army of interns).

As the title says, please share colloquial statements that encode (in a non-rigorous way, of course) some nontrivial mathematical fact (or heuristic). Instead of giving examples here I added them as answers so they may be voted up and down with the rest.

For beginners, a useful startup option is --safe-updates (or --i-am-a-dummy, which has the same effect). It is helpful for cases when you might have issued a DELETE FROM tbl_name statement but forgotten the WHERE clause. Normally, such a statement deletes all rows from the table. With --safe-updates, you can delete rows only by specifying the key values that identify them. This helps prevent accidents.

I have coded a lot of years in JavaScript and I have produced a lot of JavaScript code. Yet even with all my experience I still struggle to make JavaScript beautiful. In this post I'll explore why writing beautiful JavaScript is hard and how to improve this with CoffeeScript - a minimalistic language that compiles to JavaScript.

a side-by-side reference sheet for the hyperpolyglot; there is also a reference sheet for PHP, Perl, Python, Ruby, Smalltalk

a side-by-side reference sheet for the hyperpolyglot; there is also a reference sheet for Bash, Tcl, Lua, JavaScript, Io