Tips and Tricks

Start irb with tab completion enabled

irb --readline -r irb/completion

Executing shel commands in ruby

system "curl http://www.google.com"

Combination of in_groups_of and cycle helper

<table><% articles.in_groups_of(2, false) do |row_tasks| %><tr><%row_tasks.each do |task| %><td style="background-color:<%=cycle("red","white","blue") %>"><%= task.title %></td><% end %></tr><% end %></table>

Customized error fields

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance_tag| if html_tag =~ /type="hidden"/ || html_tag =~ /<label/ html_tag else "<span class='error_message'>#{[instance_tag.error_message].flatten.first.sub(/^\^/, '')}</span>" + "<span class='field_error'>#{html_tag}</span>" endend

Removing remote branch from GIT

git push git@github.com:genlinux/Freelance.git :heads/rubyist.rb

! [rejected] master -> master (non-fast forward)

git push origin +master:master