ipoval

$('#products').append('<%= j render(@products) %>');
<% if @products.next_page %>
  $('.pagination').replaceWith('<%= j will_paginate(@products) %>');
<% else %>
  $('.pagination').remove();
<% end %>

ipoval

fibonacci = Enumerator.new do |yielder|
  n1, n2 = 0, 1
  loop do
    yielder.yield n1
    n1, n2 = n2, n1 + n2
  end
end

p fibonacci.first(20)

ipoval

#!/usr/bin/env ruby
# encoding: utf-8

##
# @example
#   ruby -rubygems `__FILE__` `source_bucket_name` `target_bucket_name`
#
# @author @ipoval
#
# @see https://github.com/ipoval

ipoval

##
# If you encountered a problem like this:
#   Errno::EMLINK: Too many links ...releases/20110811111351/public/document/file/51159
# Most likely it is caused by the limitations of your Linux filesystem - 
# a directory can only have a certain number of sub-directories.
#
# http://blog.zachwaugh.com/post/309921185/ext3-filesystem-sub-directory-limit
#

##

ipoval

# Docs
http://redis.io
http://www.infoq.com/presentations/newport-evolving-key-value-programming-model
http://rediscookbook.org
http://www.paperplanes.de/2010/2/16/a_collection_of_redis_use_cases.html
http://thechangelog.com/post/2801342864/episode-0-4-5-redis-with-salvatore-sanfilippo
http://www.slideshare.net/pauldix/indexing-thousands-of-writes-per-second-with-redis
http://ai.mee.nu/is_couchdb_the_anti-redis
http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis
http://antirez.com/post/take-advantage-of-redis-adding-it-to-your-stack.html

ipoval

# http://hyperpolyglot.org/scripting

$? # global Process::Status object; system('date'); $?.exitstatus;

$ ruby -cw filename.rb # checks the code in the file for syntax errors
$ ruby -e '1/0'        # one-liner ruby executable

`gem environment gemdir`

ipoval

Overload your ORM safely or Black magic of metaprogramming
==========================================================

Introduction
------------

Ruby provides the great set of metaprogramming features.
Metaprogramming is a bit like magic, which makes something astonishing possible.
But there are two kinds of magic: white magic, which does good things, and black magic, which can do nasty things.
And unfortunately sometimes it is so easy to fall into the dark side of metaprogramming.

ipoval

module HttpAuthentication
  module Basic
    def authenticate_or_request_with_http_basic(realm = 'Application')
      authenticate_with_http_basic || request_http_basic_authentication(realm)
    end

    def authenticate_with_http_basic
      if auth_str = request.env['HTTP_AUTHORIZATION']
        return 'login:password' == ActiveSupport::Base64.decode64(auth_str.sub(/^Basic\s+/, ''))
      end