dmitry

# Redefines const value during block execution.
#
# Usage example:
#   SOMECONST = 1     # SOMECONST == 1
#   redefine_const(:SOMECONST, 'hello') do
#     puts SOMECONST  # SOMECONST == 'hello'
#   end
#                     # SOMECONST == 1
def redefine_const(const, value, &block)
  if const_defined = Object.const_defined?(const)

dmitry

Creating a Multi Page Form in Rails

Creating a multi-step wizard-like form is pretty difficult in Rails. 
Especially when trying to apply REST and validations. There are many 
different approaches to this problem, and the right one depends largely 
on your application details. Here are four options, and then my final 
recommendation. Skip to that if you're in a hurry.

1. Create the model at the beginning on the first page of the form, and 
have each successive page update the model. Validations are tricky 

dmitry

before "deploy:rollback:revision", "deploy:rollback_database"

  desc "Rolls back database to migration level of the previously deployed release"
  task :rollback_database, :roles => :db, :only => { :primary => true } do
    if releases.length < 2
      abort "could not rollback the code because there is no prior release"
    else
      rake = fetch(:rake, "rake")
      rails_env = fetch(:rails_env, "production")
      migrate_env = fetch(:migrate_env, "")

dmitry

set :sync_directories, ["assets", "galleries"]
set :sync_backups, 3

dmitry

module Rack
  class LocaleSetter
    def initialize app
      @app = app
    end

    def call env
      locale      = env["HTTP_HOST"].match(/^[a-z]{2}(?=\.)/)
      I18n.locale = locale ? locale.to_s : 'es'
      @app.call env

dmitry

Rails CMS alternatives
======================
  Note: project activity was checked on 11/26/09 for most of these projects, and the "last update" field has not been kept up to date since then.
  
Active projects:
---------------
adva-cms
  repo: http://github.com/svenfuchs/adva_cms/
  site: http://adva-cms.org/
  Last update: 11/24/09

dmitry

# Run rake db:size to get a print of your database size in bytes.
# Run rake db:tables:size to get the sizes for individual tables
# Works for MySQL and PostgreSQL. Not tested elsewhere.

namespace :db do
  desc 'Print data size for entire database'
  task :size => :environment do

    database_name = ActiveRecord::Base.connection.instance_variable_get("@config")[:database]
    adapter = ActiveRecord::Base.connection.adapter_name.downcase

dmitry

module Paperclip
  class Attachment
    
    class UploadedPath
      attr_reader :original_filename, :content_type, :size, :path
      def initialize(uploaded_file)
        @original_filename    = uploaded_file["name"].downcase
        @content_type = uploaded_file["content_type"].to_s.strip
        @file_size    = uploaded_file["size"].to_i
        @path         = uploaded_file["path"]

dmitry

# Put this content to ~/.irbrc file (no extension)

require "rubygems"

begin
  require "ap"
rescue LoadError => err
  puts "Cannot find awesome_print gem. Please run 'gem install awesome_print' to install it."
end

dmitry

class Ability
  include CanCan::Ability
  
  def initialize(user)
    user ||= User.new # guest user
    
    if user.role? :admin
      can :manage, :all
    else
      can :read, :all