xpepper

# Ho creato una app rails semplice, con un modello User e uno Order. 

# User:
class User < ActiveRecord::Base
  attr_accessible :name, :surname
  has_many :orders
end

#Order:
class Order < ActiveRecord::Base

xpepper

#!/usr/bin/env ruby

require 'benchmark'

REGEXPS = [
  /^no such file to load -- (.+)$/i,
  /^Missing \w+ (?:file\s*)?([^\s]+.rb)$/i,
  /^Missing API definition file in (.+)$/i,
  /^cannot load such file -- (.+)$/i,
]

xpepper

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

xpepper

class Struct
  @children = []

  def self.inherited(child)
    @children << child
  end
  class << self
    attr_accessor :children
  end
end

xpepper

Reimplementing Module#include method (my_include method):

1. my_include takes one or many modules
2. it goes on a reverse traversal and for each module it adds its features to self
3. calls an home-made hook method

class Module
  def my_include(*modules)
 modules.reverse_each do |each_module|

xpepper

Ruby #4.

class_eval vs. instance_eval

Module#class_eval:

1. set self to the receiver for the duration of the block
2. set the current class to class/module which is the receiver
3. can be called only on classes and modules

• => it's like re-opening the class/module
• => the scope of the block is that class

xpepper

class ShippingOption
  @options = []
  
  def self.inherited(child)
    @options << child
  end
  
  def self.for(weight, international)
    @options.select { |o| o.can_ship?(weight, international)}
  end

xpepper

crontab -l > CT; sed -i -e "1,11d" CT; crontab CT; rm -f CT; crontab -l

xpepper

class Module
  m = instance_method(:const_missing)
  
  define_method :const_missing do |name|
    if name.to_s =~ /^U([0-9a-fA-F]{4})$/
      [$1.to_i(16)].pack("U*")
    else
      m.bind(self).call(name)
    end
  end

xpepper

class Color
  def self.const_missing(name)
    const_set(name, new(name.to_s.downcase))
  end
  
  def initialize(color_name)
    @color_name = color_name
  end
  def to_s
    @color_name