我正在学习本教程：
http://www.rubyonrailstree.blogspot.com/2014/02/ruby-on-rails-device-gem-install-step.html
我遇到了麻烦：
rails g devise:views
＆安培;
rake db:migrate
两者都出现了类似的错误：
/home/zach/.rvm/gems/ruby-2.1.2/gems/activerecord-4.1.4/lib/active_record/dynamic_matchers.rb:26:in `method_missing': undefined method `attr_accessible' for User (call 'User.connection' to establish a connection):Class (NoMethodError)
from /home/zach/HandCoOp/project/HandCo-op/app/models/user.rb:8:in `<class:User>'
from /home/zach/HandCoOp/project/HandCo-op/app/models/user.rb:1:in `<top (required)>'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:443:in `load'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:443:in `block in load_file'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:633:in `new_constants_in'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:442:in `load_file'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:342:in `require_or_load'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:480:in `load_missing_constant'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:180:in `const_missing'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/inflector/methods.rb:238:in `const_get'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/inflector/methods.rb:238:in `block in constantize'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/inflector/methods.rb:236:in `each'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/inflector/methods.rb:236:in `inject'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/inflector/methods.rb:236:in `constantize'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:552:in `get'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:583:in `constantize'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise.rb:259:in `get'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/mapping.rb:103:in `to'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/mapping.rb:98:in `modules'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/mapping.rb:115:in `routes'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/mapping.rb:84:in `initialize'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise.rb:289:in `new'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise.rb:289:in `add_mapping'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/rails/routes.rb:190:in `block in devise_for'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/rails/routes.rb:189:in `each'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/devise-1.4.7/lib/devise/rails/routes.rb:189:in `devise_for'
from /home/zach/HandCoOp/project/HandCo-op/config/routes.rb:2:in `block in <top (required)>'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/routing/route_set.rb:337:in `instance_exec'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/routing/route_set.rb:337:in `eval_block'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/routing/route_set.rb:315:in `draw'
from /home/zach/HandCoOp/project/HandCo-op/config/routes.rb:1:in `<top (required)>'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:241:in `load'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:241:in `block in load'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:232:in `load_dependency'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:241:in `load'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:40:in `each'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/file_update_checker.rb:75:in `call'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/file_update_checker.rb:75:in `execute'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:27:in `updater'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application/finisher.rb:71:in `block in <module:Finisher>'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/initializable.rb:30:in `instance_exec'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/initializable.rb:30:in `run'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/initializable.rb:55:in `block in run_initializers'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `call'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
from /home/zach/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/initializable.rb:54:in `run_initializers'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application.rb:300:in `initialize!'
from /home/zach/HandCoOp/project/HandCo-op/config/environment.rb:5:in `<top (required)>'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:247:in `require'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:247:in `block in require'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:232:in `load_dependency'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:247:in `require'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/application.rb:276:in `require_environment!'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:147:in `require_application_and_environment!'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:133:in `generate_or_destroy'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:51:in `generate'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /home/zach/.rvm/gems/ruby-2.1.2/gems/railties-4.1.4/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
我是否使用不支持此功能的ruby版本？我将继续调查此错误，并感谢任何有此问题信息的人。
routes.rb中：
Rails.application.routes.draw do
devise_for :users
root 'home#index'
user.rb model:
class User < ActiveRecord::Base
# :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
# Setup accessible (or protected) attributes for your model
:email
:password
:password_confirmation
:remember_me
end
谢谢，希望这有帮助！
答案 0 :(得分：3)
root 'home#index'应更改root to: "home#index"。attr_accessible。你必须删除该行。使用gem时，更好的解决方案是吸引docs。因此，在您的情况下，生成视图的命令（在您将gem 'devise'添加到Gemfile并运行bundle之后）应为
a）rails generate devise:install，
b）rails generate devise:views