ASP.NET Web PDF Document Viewer/Editor Control Library

ActionPack: A library providing useful methods used in views and controllers to generate HTML and dynamic page elements, such as Ajax and JavaScript, or manage data objects. ActionWebService: Provides methods to make it easy to offer functionality from your Rails application as a Web service. This section of Rails is being removed as of Rails 1.2 in favor of alternative techniques, but it s mentioned here for completeness. ActiveRecord: An object-relational mapper (ORM) that ties database tables to classes. If you have an ActiveRecord object that references a row in a database table, you can work with that object as you would any other Ruby object (by using attributes and other methods), and changes will be stored in the relevant database table. A basic overview of ActiveRecord was given in 9. ActiveSupport: A library that collects a number of support and utility classes used by various Rails features. For example, ActiveSupport implements many useful methods for manipulating times, numbers, arrays, and hashes. Generally you won t need to know or care about each of these elements as a discrete library because you can install them all at once using RubyGems, like so:

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gem asks you if you want to install each of the libraries one by one (you can skip this by using gem install --include-dependencies rails instead), then gem installs each of them along with their documentation. If you are confident about installing Ruby libraries by this point, these instructions might be enough for you to have a basic installation of the Rails framework in place. However, there are easier alternatives that can simplify the process in Windows or on Mac OS X. Windows users can install Instant Rails (http://instantrails.rubyforge.org/), a one-stop Rails installation solution that includes Ruby, Rails, Apache, and MySQL, all preconfigured and ready to run out of the box. These elements are kept separate from your usual installations, so you can begin developing Rails applications immediately. This system is ideal to tide you over if you have problems installing Rails and/or MySQL normally. Mac users can install Locomotive (http://locomotive.raaum.org/), which provides the same features as Instant Rails, but on OS X. Locomotive will get your Mac running with Rails without breaking any existing configuration or tools you have installed.

You can see how BBP addresses the reality of dual channels by looking at a typical slide in Notes Page view, as shown in Figure 2-14. A clear headline at the top of the page always summarizes the point you ll write out these headlines in s 4 and 5. The off-screen text box in the bottom half of the page contains what you will say aloud while the slide is on screen you ll write out your narration for each slide in 6. And last you ll add a simple graphic to the slide area that you see in the top half of the page to complement the headline and the verbal narration in 8.

As Rails is used primarily to develop data-driven Web applications, it s necessary to have a database system available to use on your computer. Instant Rails and Locomotive users have MySQL installed automatically, but if you don t have a database system installed you ll need to obtain one. Database engines are covered in 9, and you can use all those covered (MySQL, SQLite, PostgreSQL, Oracle, and Microsoft SQL Server) with Ruby on Rails. However, most developers use MySQL or PostgreSQL, as Rails supports these database engines best. You often have to make hacks and tweaks to have your Rails application work with other database engines, which are beyond the scope of this chapter. This chapter assumes you have a MySQL server present on your local machine that Rails applications can use. If you don t, you can download and install the community edition of MySQL for free by visiting http://dev.mysql.com/downloads/mysql/5.0.html.

Note The inverse of getattr is setattr, which can be used to set the attributes of an object:

RubyScript2Exe is a program that can convert Ruby source code into executable files that can be used primarily on Windows and Linux. It collects your source code, along with all the files used to make your application work (including Ruby and its libraries), and packages them up into a single file that works like a typical application. As of the time of writing, RubyScript2Exe has been tested on several Linux distributions with varying versions of Ruby, and on Windows 95, 98, 2000, and XP. There is also experimental support for OS X (although for OS X users, another tool, Platypus, is covered next). To download and learn about RubyScript2Exe, visit the official site at http://www. erikveen.dds.nl/rubyscript2exe/. Once you ve created a simple executable file for the platform(s) of your choice, it becomes easy to deploy applications, as you no longer need to worry whether your target users have Ruby preinstalled or not.