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In this section I ll give a brief overview of the Ruby programming language, its concepts, and how to use the Ruby interpreter.

It s probably a safe bet that you don t want every field in your tables to be optional. Certain fields need to be required, terms of service agreements need to be accepted, and passwords need to be confirmed. That s just the way it is when you re building web applications, and Rails understands this. Consider this example of an Account model: class Account < ActiveRecord::Base validates :login, :presence => true validates :password, :confirmation => true validates :terms_of_service, :acceptance => true end Like associations, validations are sets of high-level macros that let you selectively apply common validation requirements to your model s attributes. In this section, you create a full set of validations for your blog application, and you see first-hand how easy it is to perform basic validations with Active Record. You start by applying some of the built-in validations, and then you build a couple custom validation methods.

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Ruby is an open source, object-oriented programming language created and maintained by Yukihiro Matsumoto (among others). Languages such as Perl, LISP, Smalltalk, and Python have inspired the syntax and styling of the language. It is cross platform and runs on several different architectures, although its home architecture is Linux on x86.

Among other things, Ruby has automatic garbage collection, is easily portable, supports cooperative multitasking on all supported platforms using its own threading system, has a large standard library, and supports most features associated with dynamic languages (such as closures, iterators, exceptions, overloading, and reflection). Ruby is an interpreted language. This is in opposition to languages that are compiled. Code developed in languages such as C and C++ has to be compiled into object code that represents instructions supported by a computer s processor. Ruby, however, is compiled down into platform-independent bytecode that is run by a virtual machine. Python, Java, and C# share this characteristic, although they all run upon different virtual machine implementations and have different execution characteristics. Table A-1 highlights some key differences between several popular programming languages.

Ruby has been developed with the principle of least surprise in mind, so the way you d expect things to work is usually a valid way of doing something. This means Ruby is very much a There s More Than One Way To Do It type of language, in the same vein as Perl but quite different in philosophy from languages such as Python, where having one clear process to achieve something is seen as the best way to do things.

Rails has myriad built-in validators, all of which are accessible through the validates method. You learn about some of the options the validates method accepts as you apply them to your blog application. Check the API for details of all the Rails validators (http://api.rubyonrails.org/classes/ActiveModel/Validations/ClassMethods.html#M001995). As a reference as you get started, you can pass two common options into any built-in validator. These are described in Table 5-7. Table 5-7. Default Options for All Validators

One important concept in Ruby is that almost everything is an object. For example, the following line of code calls a primitive, internal method called puts with a single argument of 10. puts prints its arguments to the screen:

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