alexyoung

require 'benchmark'

module Kernel
  alias old_require require

  def require(path)
    #unless caller.find { |caller_line| caller_line.match /dependencies\.rb/ }
    #  return old_require(path)
    #end

indirect

# Rails 2 and Rails 3 console
function rc {
  if [ -e "./script/console" ]; then
    ./script/console $@
  else
    rails console $@
  fi
}

deepak

#  how to name keys in redis for keyvalue stores

http://code.google.com/p/redis/wiki/TwitterAlikeExample
http://rediscookbook.org/introduction_to_storing_objects.html
http://www.slideshare.net/playnicelyapp/redis-schema-design-for-playnicely-redis-london-meetup
antirez has a book about keyvalue design in the pipeline
http://code.google.com/p/redis/wiki/IntroductionToRedisDataTypes

schema:
<namespace>:<globalObject>

HenrikJoreteg

// If you don't use underscore.js, use it (http://documentcloud.github.com/underscore/)
// Then, use underscore's mixin method to extend it with all your other utility methods
// like so:
_.mixin({
    escapeHtml: function () {
        return this.replace(/&/g,'&')
            .replace(/>/g,'>')
            .replace(/</g,'&lt;')
            .replace(/"/g,'&quot;')
            .replace(/'/g,'&#39;');

j-manu

Delete large number of files:
 ls|xargs -L 1000 rm

--

Maintenace page for Rails

RewriteEngine on

RewriteCond %{DOCUMENT_ROOT}/../tmp/stop.txt -f

vijaydev

Rails 3 no longer auto loads the lib folder. We can make it auto load the lib folder by putting it in config/application.rb like thus: config.autoload_paths += %W(#{config.root}/lib)

All strings are HTML escaped by default in Rails 3. Need to call html_safe on strings which we know are sure to be safe to display the HTML properly.

Reserved words: "config", "process"

Specifying RailsEnv in Apache configuration (vhost/httpd.conf etc) for Passenger 3.0.0 does not work in Rails 3. Changing that to RakeEnv does the trick. This was fixed in Passenger 3.0.1.

To add the default integer primary key to a table which was created with :id => false setting, we can do add_column :table_name, :id, :primary_key

vijaydev

Use ssh-copy-id to install your public key in a remote machine's authorized_keys. Also takes care of the permissions of the remote user's .ssh and .ssh/authorized_keys.

ssh -t reachable_host ssh unreachable_host. Enables to connect to a host unreachable from current network but reachable from reachable_host's network.

To navigate to a directory, run a command and get back: (cd /to/dir && cmd_to_run)

To rip audio out of a video file: mplayer -ao pcm -vo null -vc dummy -dumpaudio -dumpfile <out_file> <in_file>

Rsync: rsync --recursive -avz -e "ssh -p 2020" user@machine:/path dest

vijaydev

git remote prune origin - to remove a deleted remote branch.
git rebase -i - interactive rebase with options to pick, squash, discard and reorder commits.
git update-index --assume-unchanged

Undoing a merge:

$ git pull $REMOTE $BRANCH
# uh oh, that wasn't right
$ git reset --hard ORIG_HEAD
# all is right with the world

radar

yours: current_user.projects.inject(0){|sum,p| sum+= (p.users.count-1); sum}
mine:  current_user.projects.to_a.sum { |p| p.users.count -1 }

igrigorik

def tip(msg); puts; puts msg; puts "-"*100; end

#
# 30 Ruby 1.9 Tips, Tricks & Features:
# http://www.igvita.com/2011/02/03/new-ruby-19-features-tips-tricks/
#

tip "Upgrading to Ruby 1.9 is simple: rvm install 1.9.2 && rvm --default 1.9.2"

tip "Ruby 1.9 supports named captures in regular expressions!"