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sudo apt-get install libdjvulibre-dev libjpeg-dev libtiff-dev libwmf-dev libmagickcore-dev libmagickwand-dev libmagick++-dev rvm

sudo gem install rmagick

ok!

Fetching: rmagick-2.13.1.gem (100%) Building native extensions. This could take a while ... Successfully installed rmagick-2.13.1 1 gem installed

 require 'RMagick' #=> true 

sadjow

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

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en:
  errors:
    messages:
      wrong_content_type: "is the wrong content type"

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Friendly URLs

By default, Rails applications build URLs based on the primary key -- the id column from the database. Imagine we have a Person model and associated controller. We have a person record for Bob Martin that has id number 6. The URL for his show page would be:

/people/6

But, for aesthetic or SEO purposes, we want Bob's name in the URL. The last segment, the 6 here, is called the "slug". Let's look at a few ways to implement better slugs.

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# encoding: UTF-8
# pt-BR translations for Devise
pt-BR:
  devise:
    confirmations:
      confirmed: 'Sua conta foi confirmada com sucesso. Você está logado.'
      send_instructions: 'Dentro de minutos, você receberá um e-mail com instruções para a confirmação da sua conta.'
      send_paranoid_instructions: 'Se o seu endereço de e-mail estiver cadastrado, você receberá uma mensagem com instruções para confirmação da sua conta.'
    failure:
      already_authenticated: 'Você já está logado.'

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# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
   # you need an updated simple_form gem for this to work, I'm referring to the git repo in my Gemfile
  config.input_class = "form-control"

  config.wrappers :bootstrap, tag: 'div', class: 'form-group', error_class: 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.use :input

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# app/models/concerns/slugable.rb

module Slugable
  extend ActiveSupport::Concern

  included do
    validates_format_of :slug, :without => /^\d/
    before_save :generate_slug
  end

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Capybara Actions

# Anchor
click_link 'Save'

# Button
click_button 'awesome'

# Both above

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# https://37signals.com/svn/posts/2742-the-road-to-faster-tests

# spec/support/performance/deferred_garbage_collection.rb

class DeferredGarbageCollection
  DEFERRED_GC_THRESHOLD = (ENV['DEFER_GC'] || 15.0).to_f

  @@last_gc_run = Time.now

  def self.start

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# Generates SQL from migrations
#
# Usage:
#   rake db:[migrate,rollback]:with_sql
#
# The previous rake task will run migrations and create a file in `db/migrate_sql`
# Depending on migrate or rollback a file will be created with the respective
# sufix.
#
# Drawbacks: