Heroku + Devise + Paperclip + Amazon S3 Erreur

Question

Je suis le guide ici: http://webtempest.com/how-to-allow-image-uploads-in-rails-on-heroku/ Et je reçois une erreur chaque fois que je tente d'exécuter le serveur rails - ci-dessous j'ai ajouté les fichiers qui ont été modifiés avec leur code respectif. Je ne comprends pas cependant où l'erreur provient de:

erreur

sabiola@ubuntu:~/delta_bak$ rails server 
=> Booting WEBrick 
=> Rails 3.1.1 application starting in development on http://0.0.0.0:3000 
=> Call with -d to detach 
=> Ctrl-C to shutdown server 
Exiting 
/home/sabiola/delta_bak/app/models/user.rb:17: uninitialized constant User::RAILS_ROOT (NameError) 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/activesupport-3.1.1/lib/active_support/inflector/methods.rb:113:in `constantize' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/activesupport-3.1.1/lib/active_support/inflector/methods.rb:112:in `each' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/activesupport-3.1.1/lib/active_support/inflector/methods.rb:112:in `constantize' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise.rb:259:in `get' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/mapping.rb:103:in `to' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/mapping.rb:98:in `modules' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/mapping.rb:115:in `routes' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/mapping.rb:84:in `initialize' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise.rb:289:in `new' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise.rb:289:in `add_mapping' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/rails/routes.rb:190:in `devise_for' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/rails/routes.rb:189:in `each' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/devise-1.4.9/lib/devise/rails/routes.rb:189:in `devise_for' 
    from /home/sabiola/delta_bak/config/routes.rb:4 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/actionpack-3.1.1/lib/action_dispatch/routing/route_set.rb:258:in `instance_exec' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/actionpack-3.1.1/lib/action_dispatch/routing/route_set.rb:258:in `eval_block' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/actionpack-3.1.1/lib/action_dispatch/routing/route_set.rb:235:in `draw' 
    from /home/sabiola/delta_bak/config/routes.rb:1 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `load_paths' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `each' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `load_paths' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:13:in `reload!' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:7:in `initialize' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/activesupport-3.1.1/lib/active_support/file_update_checker.rb:32:in `call' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/activesupport-3.1.1/lib/active_support/file_update_checker.rb:32:in `execute_if_updated' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/finisher.rb:63 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/finisher.rb:64:in `call' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application/finisher.rb:64 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/initializable.rb:30:in `instance_exec' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/initializable.rb:30:in `run' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/initializable.rb:55:in `run_initializers' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/initializable.rb:54:in `each' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/initializable.rb:54:in `run_initializers' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/application.rb:96:in `initialize!' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `send' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `method_missing' 
    from /home/sabiola/delta_bak/config/environment.rb:5 
    from /home/sabiola/delta_bak/config.ru:4 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/rack-1.3.5/lib/rack/builder.rb:51:in `instance_eval' 
    from /home/sabiola/.rvm/gems/ruby-1.8.7-p352/gems/rack-1.3.5/lib/rack/builder.rb:51:in `initialize' 
    from /home/sabiola/delta_bak/config.ru:1:in `new' 
    from /home/sabiola/delta_bak/config.ru:1 

user.rb

class User < ActiveRecord::Base 
    # Include default devise modules. Others available are: 
    # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable 
    devise :database_authenticatable, :registerable, 
     :recoverable, :rememberable, :trackable, :validatable 

    # Setup accessible (or protected) attributes for your model 
    attr_accessible :email, :password, :password_confirmation, :remember_me, 
     :firstname, :middlename, :lastname, :discipline, :peeruser, 
     :concept, :course, :comment, :academic, :photo 
    has_attached_file :photo, :styles => { 
     :thumb => "100x100", 
     :medium => "200x200", 
     :large => "600x400" 
    }, 
    :storage => :s3, 
    :s3_credentials => "#{RAILS_ROOT}/config/s3.yml", 
    :path => ":attachment/:id/:style.:extension", 
    :bucket => 'yourbucket' 
end 

s3.yml (blanc au moment parce que Je ne peux même pas passer à l'étape suivante du guide car les rails sont en train de générer une erreur)

access_key_id: 
secret_access_key: 
bucket: 

add_photo_to_users.rb

class AddPhotoToUsers < ActiveRecord::Migration 
    def self.up 
    add_column :users, :photo_file_name, :string 
    add_column :users, :photo_content_type, :string 
    add_column :users, :photo_file_size, :integer 
    add_column :users, :photo_updated_at, :datetime 
    end 

    def self.down 
    remove_column :users, :photo_file_name 
    remove_column :users, :photo_content_type 
    remove_column :users, :photo_file_size 
    remove_column :users, :photo_updated_at 
    end 
end 

Answer 1

La RAILS_ROOT constante est dépréciée et n'est pas disponible en 3.1 (à mon humble avis)

Essayez d'utiliser: :s3_credentials => "#{Rails.root}/config/s3.yml"

Au lieu de :s3_credentials => "#{RAILS_ROOT}/config/s3.yml"