Ruby

Full article: Basic User Authentication in Rails.

Full article: 10 Steps I Took to Learn Ruby on Rails.

"Over the last few months I have analyzed a number of Rails applications w.r.t. performance problems ... . The applications targeted a variety of domains, which resulted in enough differences to make each performance improvement task challenging. However, there were enough commonalities that made it possible to extract a number of areas where each of these applications fell short of achieving good performance."

Full article: A Look at Common Performance Problems in Rails.

"Scruffy is a Ruby library for generating attractive and powerful graphs, useful for web applications, print media and many others."

Scruffy

A Ruby cheat sheet is available as a PNG or PDF.

When I started learning Ruby, I didn't understand symbols and why they are used. The links below helped me.

• The Ruby_Newbie Guide to Symbols
• Understanding Ruby Symbols
• Understanding Symbols

Below are some tutorials that I've found useful for learning Ruby and Ruby on Rails. Since it can sometimes be difficult to know where to start when learning something new, I've ordered the tutorials into steps that should help ease you in.

Step 1

Get a taste of the Ruby language. (They'll make the tutorials in step 2 easier to understand.)

• Simple Ruby Syntax
• Programming Ruby - The Pragmatic Programmer's Guide
• Learning Ruby
• why's (poignant) guide to ruby. (The author seems to be insane, but that's OK.)

Step 2

Next, read these to get started with Ruby on Rails: