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CHAPTER 7 PROJECTS AND LIBRARIES
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Upgrading and Uninstalling Gems
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One of the main features of RubyGems is that gems can be updated easily. You can update all of your currently installed gems with a single line:
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gem update
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This makes gem go to the remote gem repository, look for new versions of all the gems you currently have installed, and if there are new versions, installs them. If you only want to upgrade a specific gem, suffix the preceding command line with the name of the gem in question. Uninstalling gems is the simplest task of all. Use the uninstall command (where feedtools is replaced by the name of the gem you wish to uninstall):
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gem uninstall feedtools
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If there are multiple versions of the same gem on the machine, gem will ask you which version you want to uninstall first (or you can tell it to uninstall all versions at once), as in this example:
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$ gem uninstall rubyforge
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Select RubyGem to uninstall: 1. rubyforge-0.3.0 2. rubyforge-0.3.1 3. All versions
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Naturally, it s possible to create gems from your own libraries and applications. This entire process is covered in 10, along with the other ways you can deploy your applications to users (or the world!).
Summary
In this chapter we ve looked at some of the methods Ruby provides to make it possible to handle larger projects, as well as access the vast universe of prewritten code libraries to make development easier.
CHAPTER 7 PROJECTS AND LIBRARIES
As well as being able to include code from other files, we ve looked at using modules (and their namespaces) to separate potentially clashing classes, methods, and constants into distinct groups. Modules also provide a way to mix in functionality to other classes without using inheritance. Ruby provides a wealth of useful libraries within the main distribution, but using tools such as RubyGems allows you to get access to code written by thousands of other Ruby developers, allowing you to implement more-complex programs more quickly than would otherwise be possible. Let s reflect on the main concepts covered in this chapter: Project: Any collection of multiple files and subdirectories that form a single instance of a Ruby application or library. require: A method that loads and processes the Ruby code from a separate file, including whatever classes, modules, methods, and constants are in that file into the current scope. load is similar, but rather than performing the inclusion operation once, it reprocesses the code every time load is called. Library: A collection of routines, classes, methods, and/or modules that provides a set of features that many other applications can use. RubyGems: Packaging system for Ruby libraries and/or applications that makes them easier to install and maintain by developers. Edge/source/development builds: Special versions of libraries and applications that aren t official releases, but reflect the latest work performed by the developers of the library or application. However, with the popularity of test-driven development, many of these cutting-edge libraries are still reliable to use, though their most recently added features might not be fully documented or tested. Gem: A single library (or application) packaged up using the RubyGems system. Can also be called a RubyGem. In many of the chapters from here on, we ll be using the power of libraries, and combining multiple libraries to make single applications. One such example is the Ruby on Rails framework we ll be covering in 13, which is, in essence, a giant library made up of several libraries itself! In 16, we ll come back to RubyGems and look at some of the most useful gems available, their functions, and how to use them.
CHAPTER
Documentation, Error Handling, Debugging, and Testing
n this chapter we re going to look at the finer details of developing reliable programs: documentation, error handling, debugging, and testing. These tasks aren t what most people think of as development, but are as important to the overall process as general coding tasks. Without documenting, debugging, and testing your code, it s unlikely that anyone but you could work on the code with much success, and you run the risk of releasing faulty scripts and applications. This chapter demonstrates how to produce documentation, handle errors in your programs, test the efficiency of your code, and make sure that your code is (mostly) bug free, all using tools that come with Ruby.
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