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/* How to calculate postgreSQL database size in disk ? */

SELECT pg_size_pretty(pg_database_size('thedbname'));

/* Calculate size of a table including or excluding the index */

SELECT pg_size_pretty(pg_total_relation_size('big_table'));
SELECT pg_size_pretty(pg_relation_size('big_table')); /* without index */

/* See indexes on a table with `\d tablename` */

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# http://metaskills.net/2011/01/25/from-test-unit-shoulda-to-minitest-spec-minishoulda/
# Gives you all the the stuff to make existing shoulda tests work!
class MiniTest::Spec
  class << self
    alias :setup :before unless defined?(Rails)
    alias :teardown :after unless defined?(Rails)
    alias :should :it
    alias :context :describe
  end
  alias :assert_no_match  :refute_match

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http://www.padrinorb.com/guides/adding-new-components#rendering-engine (a bit outdated)

Slim overview:

Helpers support

https://github.com/padrino/padrino-framework/blob/master/padrino-helpers/lib/padrino-helpers/output_helpers/slim_handler.rb

Gen Support

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• http://travis-ci.org/#!/padrino/padrino-framework/builds/68397
• https://github.com/padrino/padrino-framework/blob/master/Gemfile
• travis-ci/travis-ci#204

Using worker: staging:worker-2

$ git clone --depth=1000 --quiet git://github.com/padrino/padrino-framework.git ~/builds/padrino/padrino-framework
$ git checkout -qf 5e7f244de66bf412e5183b50827019d894eb6e4d
$ rvm use 1.9.2

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Upgrade to Lion

Link: http://blog.therubymug.com/blog/2011/07/26/the-install-osx-lion.html

• Install XCode 4
• Brew: brew update && brew upgrade
• RVM: rvm update --head rvm reload rvm repair all
• Gems: gem pristine

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RailsDevBoost

Checkout RailsDevBoost:

# Gemfile
gem 'rails-dev-boost', :git => 'git://github.com/thedarkone/rails-dev-boost.git', :require => 'rails_development_boost', :branch => 'rails-2-3'

rails-test-serving

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require 'benchmark'

haystack = (1..1_000_000).to_a
needles = 1.upto(100).map {|n| n * 10_000}

module EachDetector
  def self.find(haystack, needle)
    haystack.each do |v|
      return true if v == needle
    end

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class IndexUsersEmails < ActiveRecord::Migration
  def self.up
    execute "END"
    add_pg_index :users, :email, :lock => false
    execute "BEGIN"
  end
end

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object @posts

attributes :id, :title, :created_at

child :user do
  extends "users/show"
end

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require 'benchmark'
require 'active_support/all'
require 'httparty'

HOST = "http://listify-it.herokuapp.com"

def benchy(name, count=5)
  result = Benchmark.realtime { count.times { HTTParty.get("#{HOST}/debug/#{name}") } } / count.to_f
  "#{(result * 1000).round} ms average"
end