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class ApplicationController < ActionController::Base
  protect_from_forgery

  def current_ability
    @current_ability ||= Spree::Ability.new(current_user)
  end

  rescue_from CanCan::AccessDenied do |exception|
    redirect_to :root, :alert => exception.message
  end

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# create a file in config/initializers, e.g. add_abilities_to_spree.rb,
# with the following content:

Spree::Ability.register_ability MyAppAbility

# create a file under app/models (or lib/) to define your abilities (in
# this example I protect only the HostAppCoolPage model):

class MyAppAbility
  include CanCan::Ability

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HostApplication::Application.routes.draw do
  devise_for :user,
             :class_name => 'Spree::User',
             :controllers => { :sessions => 'spree/user_sessions',
                               :registrations => 'spree/user_registrations',
                               :passwords => 'spree/user_passwords' },
             :skip => [:unlocks, :omniauth_callbacks],
             :path_names => { :sign_out => 'logout' }
  # ...
end

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  composed_of :expire_date_minus_one_day,
              :class_name => 'Date',
              :mapping => %w(Date to_s),
              :constructor => Proc.new{ |item| item },
              :converter => Proc.new{ |item| item }

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  <p>
    <%= f.label :expire_date %>
    <%= f.date_select :expire_date_minus_one_day %>
  </p>

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  def expire_date_minus_one_day
    self.expire_date - 1.day
  end

  def expire_date_minus_one_day= date
    self.expire_date = date + 1.day 
  end

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  # person.rb

    validates_presence_of :address

  # blueprints.rb

    Person.blueprint do
      name     { "John"       }
      surname  { "Doe"        }
      address  { Address.make }

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  AREL (0.5ms)  INSERT INTO "addresses" ("country", "planet", "created_at",
"updated_at") VALUES ('Italy', 'Earth', '2011-06-18 16:45:00.268423',
'2011-06-18 16:45:00.268423')

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  # person.rb

    validates_presence_of :address

  # person_factory.rb

    Factory.define :person do |p|
      p.name   'John'
      p.surname 'Doe'
      p.association :address

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ActiveRecord::Base.connection.increment_open_transactions
ActiveRecord::Base.connection.begin_db_transaction
at_exit do
   ActiveRecord::Base.connection.rollback_db_transaction
   ActiveRecord::Base.connection.decrement_open_transactions
end