norman

class Author < ActiveRecord::Base
  has_many :books
end

class Book < ActiveRecord::Base
  belongs_to :author
end

@author = Author.find(params[:id], :include => :books)

norman

class Sound < Test::Unit::TestCase

  include Spanish::Phonology

  test "should get sound from symbol" do
    sound = Sound.new("b")
    assert_equal "b", sound.symbol
    assert sound.labial?
    assert sound.stop?
    assert sound.consonantal?

norman

# ruby-1.9.1-p243
"é".center(5, 'a') # => "aaéaa"
"é".center(5, "á") # => "ááéáá" 

# ruby-1.9.1-p378
"é".center(5, 'a') # => "aaéaa"
"é".center(5, 'á') # => "áéá"

norman

Various snippets that were annoying to create and that I don't want to forget

vim regexp to convert CSS to SASS:

g/^(\s*)([a-z-]):\s*(.*);/s//\1:\2 \3/g

norman

# Here's a piece of functionality I need to access often inside my library. It breaks an int
# into an array of bits, with each bit's position in the int corresponding to its array
# index. This gives me a consise way to check to see if lots of different bits are set.
123.to_s(2).reverse.split("").map(&:to_i)

# So, where do I put this? Should I monkey-patch Fixnum?
class Fixnum
  def to_bit_array
    to_s(2).reverse.split("").map(&:to_i)
  end

norman

module MyNamespace

  class << self
    # I want this utility method available everywhere inside my namespace,
    # but I don't want to expose it in the API, so let's make it "protected."
    def do_something
      puts "hello"
    end
    protected :do_something
  end

norman

$ lua -e 'for i=1,4 do print(string.byte("ザ", i)) end'
227
130
182

$ lua -e 'print(string.char(227, 130, 182))'
ザ

norman

# It's pretty easy to set a custom method as the basis of your friendly_id if
# you want to incorporate information from another model in the friendly_id.
class City < ActiveRecord::Base

  belongs_to :state
  has_friendly_id :city_and_state, :use_slugs => true

  # This will return something like "San Francisco, California". It can be used
  # as a display name in your views, and also as the basis of the friendly_id
  # because it will be processed by the plugin to remove spaces, punctuation,

norman

Selecting 10 rows from a table with 100,000 records:

                            MYSQL | SQLITE3 | POSTGRES |
--------------------------------------------------------
Ordered SELECT id           0.021 |   0.040 |    0.021 |
Ordered SELECT *            0.001 |   0.001 |    0.006 |
Random  SELECT id           0.070 |   0.132 |    0.040 |
Random  SELECT *            0.607 |   0.176 |    0.061 |

norman

# $ mysql --version
# mysql  Ver 14.14 Distrib 5.1.43, for apple-darwin10.2.0 (i386) using  EditLine wrapper
# $ psql --version
# psql (PostgreSQL) 8.4.2
# contains support for command-line editing
# $ sqlite3 --version
# 3.6.12
# $ ruby --version
# ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-darwin10.2.0]
# $ uname -a