equivalent

class Option < ActiveRecord::Base

  def self.sti_class_names
    %w[Alert Foo Bar]
  end

  #define STIs
  sti_class_names.each do |class_name|
    new_class = Class.new(Option) do
      def self.model_name

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describe SomeModel do
  it do
    p accessible_attributes_for(:contact)
  end 
end

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

require 'rubygems'
begin
require 'bundler/setup'
rescue LoadError
end
require 'digest/sha1'
require 'openssl'

equivalent

Patched ruby 1.9.3-p194 for 30% faster rails boot

Overview

This script installs a patched version of ruby 1.9.3-p194 with boot-time performance improvements (#66 and #68), and runtime performance improvements (#83 and #84). It also includes the new backported GC from ruby-trunk.

Many thanks to funny-falcon for the performance patches.

• http://github.com/ruby/ruby/pull/66
• http://github.com/ruby/ruby/pull/68

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This gist was writen in 2012 and it was solving specific problem in Rails & SimpleForm. Some fellow developers were pointing out this may be out dated concept. That's why I advise everyone to read comment section bellow to have a full grasp of alternative solutions

other sources that may be helpful to understand why this may not be best idea:

• Why Ruby doesn’t have a Boolean class

equivalent

module CustomSimpleFormHelper
  def simple_form_for(object, *args, &block)
    options = args.extract_options!

    action_classes = [object.class.model_name.underscore , (object.persisted? ? 'edit' : 'new')]

    options[:html]={} unless options[:html]

    if options[:html].empty?
      options[:html][:class] = action_classes

equivalent

# The BootstrapBreadcrumbsBuilder is a Bootstrap compatible breadcrumb builder.
# It provides basic functionalities to render a breadcrumb navigation according to Bootstrap's conventions.
#
# BootstrapBreadcrumbsBuilder accepts a limited set of options:
# * separator: what should be displayed as a separator between elements
#
# You can use it with the :builder option on render_breadcrumbs:
#     <%= render_breadcrumbs :builder => ::BootstrapBreadcrumbsBuilder, :separator => "&raquo;" %>
#
# Note: You may need to adjust the autoload_paths in your config/application.rb file for rails to load this class:

equivalent

My issues with Modules

In researching topics for RailsCasts I often read code in Rails and other gems. This is a great exercise to do. Not only will you pick up some coding tips, but it can help you better understand what makes code readable.

A common practice to organize code in gems is to divide it into modules. When this is done extensively I find it becomes very difficult to read. Before I explain further, a quick detour on instance_eval.

You can find instance_eval used in many DSLs: from routes to state machines. Here's an example from Thinking Sphinx.

class Article < ActiveRecord::Base

equivalent

class Document < ActiveRecord::Base

  belongs_to :parent, class_name: 'Document'

  def self.get_ancestors(who)
    @tree ||= []
    # @tree is instance variable of Document class object not document instance object
    # so: Document.get_instance_variable('@tree')

    if who.parent.nil?

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# spec/lib/tasks/notification_rake_spec.rb
require 'spec_helper'

describe 'notifications:weekly' do
  include_context "rake"

  let(:users){ [double(:user)] }
  let(:user_deliveries){ double(:user_deliveries) }

  before{ User.stub(:all).and_return( users ) }