amejiarosario

Rails Migration

http://guides.rubyonrails.org/migrations.html

Migrations methods:

• add_column
• add_index
• change_column
• change_table
• create_table
• drop_table

codingricky

DiUS is starting a bowling club. To help with the club, we have engaged you to program a scoring system.

The features on the system are:

• One player only
• In each frame, the bowler has 2 tries to knock down all the pins
• If in 2 tries, the bowler fails to knock down all the pins, their score is the sum of the number of pins they've knocked down in the 2 attempts

E.g, if a bowler rolls, 4,4

bendangelo

module Paperclip
  
  #converts a string into a file for paperclip to save
  # useage
  # self.avatar = Paperclip::string_to_file('bob.png', 'image/png', 'BASE64 here')
  def self.string_to_file(name, type, data)
    image = StringIO.new(data)
    image.class.class_eval { attr_accessor :original_filename, :content_type }
    image.original_filename = name
    image.content_type = type

jfarmer

# In Ruby everything is an object, including classes.
# That means class methods are instance methods of some object.
# But what object?

class Object
  def eigenclass 
    class << self
      self
    end 
  end 

oodavid

Backup MySQL to Amazon S3

This is a simple way to backup your MySQL tables to Amazon S3 for a nightly backup - this is all to be done on your server :-)

Sister Document - Restore MySQL from Amazon S3 - read that next

1 - Install s3cmd

this is for Centos 5.6, see http://s3tools.org/repositories for other systems like ubuntu etc

henrik

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

KL-7

One-liners

Reverse every line:

Input file:

$ cat foo
qwe
123

bar

czj

# This script is greatly inspired by Pry Everywhere by Luca Pette
# http://lucapette.com/pry/pry-everywhere/

# Use TextMate as default editor
Pry.config.editor = "mate -w"

# My pry is polite
Pry.hooks = {
  :after_session => proc {
    puts "\nGoodbye." if Pry.active_sessions == 1

michiel

#
# Wide-open CORS config for nginx
#
location / {

     if ($request_method = 'OPTIONS') {

        add_header 'Access-Control-Allow-Origin' '*';
        
        #

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!"