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Mac OS X has a number of text editors available. TextMate by MacroMates (http://www. macromates.com/), as shown in Figure 4-1, tends to be the most respected in the Ruby community, but it costs approximately $60. Xcode, included with the OS X development tools, is also a viable alternative (and it s free), but requires that you know how to install and use the development tools (these come on your OS X installation disc). Xcode may also feel somewhat slower than a regular text editor, depending on the specification of your Mac. Included with OS X for free, however, is TextEdit. You can load TextEdit by going to your Applications folder and double-clicking the TextEdit icon. In its default mode, TextEdit isn t a plain text editor, but if you go to the Format menu and select Make Plain Text, you ll be taken to a plain text editing mode that s suitable for editing Ruby source code.

At this point, you can simply type or paste Ruby code, and use the File Save menu option to save your text to a location on your drive. It would probably be good to create a folder called ruby within your home folder (the folder on the left that has your username in it) and save your initial Ruby source code there (using a filename such as myapp.rb), as this is what the instructions assume in the next section.

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That s a lot of methods! Don t worry you don t need to memorize all 396 of them, and most of them are private to Active Record and are used internally, so you ll never even use them. Still, it s important, if for no other reason than to get a sense of what you get for free just by subclassing Active Record. Even though in this case, ActiveRecord:: Base is considered the superclass, it sure makes our lowly Event class super, doesn t it (Sorry, enough bad humor.)

The following sections use the articles table presented in the previous section to show some examples of how these commands work. Remember that it s not necessary to have a complete understanding of SQL to work with Rails. The whole point of Active Record is to alleviate the tedium of needing to construct complex SQL statements to view and otherwise manipulate your data.

Desktop Linux distributions typically come with at least one text editor. If you re working entirely from the shell or terminal, you might be familiar with vi, Emacs, pico, or nano, and all of these are suitable for editing Ruby source code. If you re using Linux with a graphical interface, you might have Kate (KDE Advanced Text Editor) and/or gedit (GNOME Editor) available. All the preceding are great text and source code editors. You could also download and install a full IDE (integrated development environment) such as NetBeans or RadRails. Both have comprehensive Ruby support and can be found respectively at http://www.netbeans.org/ruby/ and http://www.aptana.com/. At this stage, it would be a good idea to create a folder in your home directory called ruby, so that you can save your Ruby code there and have it in an easily remembered place.

Object-oriented programming is all about objects. You create classes that encapsulate all the logic required to create an object, along with its properties and attributes, and use the class to produce new objects, each of which is a unique instance, distinct from other objects of the same class. That might sound a little abstract (and with good reason abstraction, after all, is the name of the game), but if it helps, you can think of a class as being an object factory. The obvious example is that of a car factory. Contained within a car factory are all the resources, tools, workers, and processes that are required to produce a shiny new car. Each car that comes off the assembly line is unique. The cars may vary in size, color, and shape, or they may not vary from each other much at all. The point is that even if two cars share the exact same attributes, they are not the same car. You certainly wouldn t expect a change to the color of one car to affect all the others, would you Well, in object-oriented programming, it s not much different. The class is the factory that produces objects, which are called instances of a class. From a single factory, an infinite number of objects can be produced.

Once you ve got an environment where you can edit and save text files, enter the following code: x = 2 print "This application is running okay if 2 + 2 = #{x + x}"

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