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2610 - Cheat Sheet - what do you need for Ruby on Rails?
Here is a "cheat sheet" of the commands you might use to install Ruby, then Gems, then Rails, then get your first application and server running. 1. Ruby tar xf ruby-1.9.1-p376.tar.gz cd ruby-1.9.1-p376/ ./configure make make install Check installation: [root@easterton ruby-1.9.1-p376]# ruby -v ....

2609 - Scope of variables - important to Ruby on Rails
Yesterday's Ruby on Rails training day brought home just how important it is to ensure that your Ruby variables are correctly "scoped" - that you tell Ruby if they're to be local to the method in which they are defined, to be available to all methods that run on the same objects, to all objects of a ....

2608 - Search and replace in Ruby - Ruby Regular Expressions
"If you want to replace one part of a string by another in Ruby, you can use the sub method on your string object. The first parameter you give to the method is the string you want to replace, and the second is the string you want to replace it by." OK - that's the easy bit ... but what if .... I ....

2607 - Answers on Ruby on Rails
What is Ruby on Rails? Ruby on Rails is a clever way of programming your web server in Ruby - it allows you to have data in databases on your website and provide very easy access tothat data through a browser, allowing your customers to see the data and you staff to see it, alter it, and add more d ....

2606 - Sorting arrays and hashes in Ruby
In Ruby, you can use the sort method on an array to sort that array - but you cannot sort a hash. That's because of the techniques used within a hash to make it very fast to look up individual elements. So what do you do if you want to sort something like this: ? stuff = {"Steve" => "Kent", "Grah ....

2605 - Ruby on Rails - a sample application to teach you how
The Ruby on Rails Framework is a great way to put bolt web applications together quickly - but it can be overwhelming when you come to do it for the first time. There's a steep learning curve with all the various elements to put together to make up the whole. We have a first (tiny!) demonstration i ....

2604 - Tips for writing a test program (Ruby / Python / Java)
Where does my test code go? If you've written a class - a series of methods to be used within another application - how do you test it? How about writing a test program within the same file which runs as the main program if you run your class on its own from the command line, but is ignored if yo ....

2603 - Ruby objects - a primer
If you're new to Ruby, but familiar with Object Oriented Programming, you might like to take a quick look at the example that I wrote during yesterday's course which shows how all the major OO elements are implemented in Ruby. The sample source is [here]. Here are some of the key facts: • ....

2602 - East of Melksham - Building Work Starts
The extension of houses to the East of Melksham started off the Sandridge Road at the tail end of last year, but the fields at the end of Snowberry Lane (the section to the south of Snarleton Lane) hadn't really got underway - this first picture is a Christmas one, showing just a few stakes inthe gr ....

2601 - Ruby - is_a? v instance_of? - what is the difference?
In Ruby, have you ever wanted to know if an object is of a particular type? The instance_of? method will return a true value if an object is of the type given as a parameter. However, instance_of? will return a false if we use it to check whether an object inherits from another class. So it's a ....

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