Instead of this:

   1  Sitemap('public/sitemap.xml') do
   2    self.stylesheet = 'public/sitemap.xls'  
   3    self.ping = ['http://www.google.com', 'http://www.google.com']  
   4  end

You could write this:

   1  Sitemap('public/sitemap.xml') do
   2    stylesheet 'public/sitemap.xls'  
   3    ping ['http://www.google.com', 'http://www.google.com']  
   4  end

Using dual-purpose accessors:

   1  class Sitemap
   2    def stylesheet(path = nil) 
   3      return @path unless path
   4     @path = path
   5    end
   6    alias_method :stylesheet=, :stylesheet 
   7    ...
   8  end

If you get this error:

   1  % script/console
   2  Loading development environment (Rails 2.3.4)
   3  /Library/Ruby/Site/1.8/universal-darwin10.0/readline.bundle: dlopen(/Library/Ruby/Site/1.8/universal-darwin10.0/readline.bundle, 9): Library not loaded: /opt/local/lib/libreadline.6.dylib (LoadError)
   4    Referenced from: /Library/Ruby/Site/1.8/universal-darwin10.0/readline.bundle
   5    Reason: image not found - /Library/Ruby/Site/1.8/universal-darwin10.0/readline.bundle
   6          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/completion.rb:10
   7          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/init.rb:253:in `require'
   8          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/init.rb:253:in `load_modules'
   9          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/init.rb:251:in `each'
  10          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/init.rb:251:in `load_modules'
  11          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/init.rb:21:in `setup'
  12          from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:54:in `start'
  13          from /usr/bin/irb:13

then this might help:

   1  mv /Library/Ruby/Site/1.8/universal-darwin10.0/readline.bundle /tmp

If not move it back. I got the error after having used and uninstalled MacPorts. Using Homebrew now…

This ugly one-liner will pretty print the JSON in countries.yml, so that it’s easier to read and edit:

   1  cat db/seeds/countries.yml | ruby -rubygems -e 'require "json";a=JSON.pretty_generate JSON.parse gets;File.open("db/seeds/countries.yml", "w"){|f| f << a}'

A handy oneliner which I found here.

   1  ruby -r webrick/httpproxy -e 's = WEBrick::HTTPProxyServer.new(:Port => 9999, :RequestCallback => Proc.new{|req,res| puts req.request_line, req.raw_header}); trap("INT"){s.shutdown}; s.start'

This will save you from playing with PATH:

   1  sudo ln -fs /opt/ruby-enterprise-1.8.6-20090610 /opt/ruby-enterprise
   2  sudo ln -fs /opt/ruby-enterprise/bin/gem /usr/bin/gem
   3  sudo ln -fs /opt/ruby-enterprise/bin/irb /usr/bin/irb
   4  sudo ln -fs /opt/ruby-enterprise/bin/rake /usr/bin/rake
   5  sudo ln -fs /opt/ruby-enterprise/bin/rails /usr/bin/rails
   6  sudo ln -fs /opt/ruby-enterprise/bin/ruby /usr/bin/ruby

Passsenger.conf is also simplified:

   1  LoadModule passenger_module /opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-2.2.5/ext/apache2/mod_passenger.so
   2  PassengerRoot /opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-2.2.5
   3  PassengerRuby /opt/ruby-enterprise/bin/ruby