practicingruby

Inheritance is a key concept in most object-oriented languages, but applying it skillfully can be challenging in practice. Back in 1989, M. Sakkinen wrote a paper called Disciplined inheritance that addresses these problems and offers some useful criteria for working around them. Despite being more than two decades old, this paper is extremely relevant to the modern Ruby programmer.

Sakkinen's central point seems to be that most traditional uses of inheritance lead to poor encapsulation, bloated object contracts, and accidental namespace collisions. He provides two patterns for disciplined inheritance and suggests that by normalizing the way that we model things, we can apply these two patterns to a very wide range of scenarios. He goes on to show that code that conforms to these design rules can easily be modeled as ordinary object composition, exposing a solid alternative to tradi

okeen

#encoding: utf-8
#creates FB test users and stores their data in a YML file
task :create_and_load_facebook_test_users => :environment do
  require 'koala'

  @@file_name = "db/fb_test_users.yaml"

  #FB doesn't allow integers on user names, so we need to create names like "user_aa", "user_ab", etc.
  def next_name(player_number)
    first_letter = ((player_number / 24).to_i + 97).chr

thijsc

def select_from_chosen(item_text, options)
  field = find_field(options[:from])
  option_value = page.evaluate_script("$(\"##{field[:id]} option:contains('#{item_text}')\").val()")
  page.execute_script("$('##{field[:id]}').val('#{option_value}')")
end

raul

# Ruby `retry` with steroids:
#
# - retry up to 5 times without waiting between them and retrying after any exception
#
#     retry_upto(5) do ... end
#
# - retry up to 5 times, waiting 2 seconds between retries
#
#     retry_upto(5, :wait => 2) do ... end
#

Bertg

class MigrateUserToDevise < ActiveRecord::Migration
  def self.up
    change_table :users do |t|
      t.string :encrypted_password, :null => false, :limit => 128
      # ...
    end
  end

  def self.down
  end

schacon

$ git branch -r --merged | 
  grep origin | 
  grep -v '>' | 
  grep -v master | 
  xargs -L1 | 
  awk '{split($0,a,"/"); print a[2]}' | 
  xargs git push origin --delete

silviorelli

# Rails.root/config.ru
require "./config/environment"
run ActionController::Dispatcher.new

BinaryMuse

require 'cgi'
require 'digest/md5'
require 'net/https'
require 'uri'

module Jekyll
  class GistTag < Liquid::Tag
    def initialize(tag_name, text, token)
      super
      @text           = text

leaniman

En el application_controller.rb:

  def render_to_fancybox(options)
    html = render_to_string(options).to_json
    render :update do |page|
        page << "$.fancybox(#{html});"
    end
  end

En cualquier controlador:

raul

  def fucking_ie6?
    request.env['HTTP_USER_AGENT'] and request.env['HTTP_USER_AGENT'].include? "MSIE 6.0"
  end