Discovering Ruby .

1. Discovering Ruby. Welcome to Barcamp Ireland!

2. So what are you talking about? • I’m going to talk through my early days with ruby. • I’m trying to build a ruby applications so what I know is based off that. • But I’m not with ruby that long either so if I look blankly at you, prompt me about where to ask. • http://poignantguide.net/ruby/chapter-2.html

3. http://tryruby.hobix.com/ So where do you go to first?

4. Whats the coolest thing you learn there?

5. www.ruby-lang.org/ • The recently redesigned ruby homepage. • Good for downloading ruby, updates, finding links and the ruby reference library. • Bad for finding unusual but good ruby sources. • Bad for finding simple ruby examples.

6. Other Resources to look at. • Ruby Garden.www.rubygarden.org/ • Ruby core library • www.ruby-doc.org/core/ • Ruby standard library • www.ruby-doc.org/stdlib/

7. Ruby User guide. • Again we are looking at the very basics. • No ties to the standard library. So you cant see a follow through. • Hard to tell without running the code if the code is up to date. • Out of date code is a big problem when you are error checking.

8. So how can you? Besides using ruby-on-rails. Pikeaxe says ruby-tk. So that’s what I went with.. However Ruby-tk is poorly documented. QT is considered better documented and prettier. So you want to make a ruby application?

9. QT Verses Ruby-Tk • And don’t you partly use ruby for the prettiness. • So finding out ruby-tk is not pretty is upsetting. • QT is dual licensed. A commerical license and a GPL. • But I went with Ruby-tk so I cant help you with QT. • http://poignantguide.net/ruby/chapter-2.html

10. http://pub.cozmixng.org/~the-rwiki/? • Useful due to lots of examples. • Unfortunately in japanese. • Unfortunately some of the code is out of date. • Still probally one of the best ruby-tk references.

11. Some simple ruby-tk code.Button packing. require "tk" TkLabel.new { text "Top" pack('side' => 'top') } TkLabel.new { text "Middle" pack('side' => 'top') } TkLabel.new { text "Bottom" pack('side' => 'top') } Tk.mainloop

12. So you need a database. For mysql you have two modules to choose from. Confused? Thought this was newbie-friendly? Well Ruby gems will help you install whichever one you pick. Ruby and Mysql

13. Ruby Gems • http://rubyforge.org/projects/rubygems/ • Ruby gems helps you install add-ons to ruby. • It tries to make life easier. • However you will have to reinstall your gems every time you upgrade ruby.

14. Mysql ruby test code from Kitebird. You will know this test. • Simple.rb • require “mysql” •    begin       #this example is used for checking if your installation is correct.       # connect to the MySQL server       dbh = Mysql.real_connect(”localhost”, “testuser”, “testpass”, “test”)       # get server version string and display it       puts “Server version: ” + dbh.get_server_info   rescue MysqlError => e       print “Error code: “, e.errno, “\n”       print “Error message: “, e.error, “\n”   ensure  # disconnect from server       dbh.close   end

15. So you have the means • You have your database, ruby can connect to the database. • You have picked your gui method. • You think you can make one. • What now? • http://poignantguide.net/ruby/chapter-2.html

16. Any questions? Error messages! • hook C:/ruby/rubygems-0.9.0/ ./post-install.rb failed:undefined method 'post_install_message' for #<Gem::Specification:0X3337fa8>