Rails4和Devise（NoMethod错误）

我正在学习如何使用rails gem在ruby上构建Web应用程序。 遵循本教程： http ： //12devs.co.uk/articles/writing-a-web-application-with-ruby-on-rails/

在我开始为用户身份validationfunction安装Devise gem之前，一切都很好。

在执行rails generate devise:install之后我收到错误

错误报告是这个史诗（看起来我以某种方式搞砸了一些依赖）：

 sergey@sergey-VirtualBox:~/Bookmarks$ rails generate devise:install /home/sergey/.rvm/gems/ruby-2.1.2/gems/activerecord-4.1.0/lib/active_record/dynamic_matchers.rb:26:in `method_missing': undefined method `devise' for Install (call 'Install.connection' to establish a connection):Class (NoMethodError) from /home/sergey/Bookmarks/app/models/install.rb:4:in `' from /home/sergey/Bookmarks/app/models/install.rb:1:in `' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:443:in `load' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:443:in `block in load_file' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:633:in `new_constants_in' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:442:in `load_file' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:342:in `require_or_load' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:480:in `load_missing_constant' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:180:in `const_missing' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/inflector/methods.rb:238:in `const_get' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/inflector/methods.rb:238:in `block in constantize' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/inflector/methods.rb:236:in `each' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/inflector/methods.rb:236:in `inject' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/inflector/methods.rb:236:in `constantize' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:552:in `get' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:583:in `constantize' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise.rb:297:in `get' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:77:in `to' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:72:in `modules' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:89:in `routes' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:156:in `default_used_route' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:66:in `initialize' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise.rb:331:in `new' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise.rb:331:in `add_mapping' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/rails/routes.rb:221:in `block in devise_for' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:in `each' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:in `devise_for' from /home/sergey/Bookmarks/config/routes.rb:2:in `block in ' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.0/lib/action_dispatch/routing/route_set.rb:335:in `instance_exec' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.0/lib/action_dispatch/routing/route_set.rb:335:in `eval_block' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.0/lib/action_dispatch/routing/route_set.rb:313:in `draw' from /home/sergey/Bookmarks/config/routes.rb:1:in `' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `block in load' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:40:in `block in load_paths' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:40:in `each' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:40:in `load_paths' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:16:in `reload!' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:26:in `block in updater' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/file_update_checker.rb:75:in `call' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/file_update_checker.rb:75:in `execute' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:27:in `updater' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application/finisher.rb:71:in `block in ' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `instance_exec' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `run' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/initializable.rb:55:in `block in run_initializers' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each' from /home/sergey/.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/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `call' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each' from /home/sergey/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/initializable.rb:54:in `run_initializers' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application.rb:288:in `initialize!' from /home/sergey/Bookmarks/config/environment.rb:5:in `' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `block in require' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/application.rb:264:in `require_environment!' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:147:in `require_application_and_environment!' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:133:in `generate_or_destroy' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:51:in `generate' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:40:in `run_command!' from /home/sergey/.rvm/gems/ruby-2.1.2/gems/railties-4.1.0/lib/rails/commands.rb:17:in `' from bin/rails:4:in `require' from bin/rails:4:in `' 

我使用的操作系统是托管在Oracle Virtualbox中的Ubuntu 14。 Virtualbox在Windows 7上运行。安装的ruby版本是：

 sergey@sergey-VirtualBox:~/Bookmarks$ ruby -v ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux] 

项目创建如下：

 rails new Bookmarks -T -d sqlite3 -B 

Gemfile.rb内容是：

 source 'https://rubygems.org' # Devise gem for User Authorisation gem 'devise', '~> 3.2.4' # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.1.0' # Use sqlite3 as the database for Active Record gem 'sqlite3' # Use SCSS for stylesheets gem 'sass-rails', '~> 4.0.3' # Use Uglifier as compressor for JavaScript assets gem 'uglifier', '>= 1.3.0' # Use CoffeeScript for .js.coffee assets and views gem 'coffee-rails', '~> 4.0.0' # See https://github.com/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', platforms: :ruby # Use jquery as the JavaScript library gem 'jquery-rails' # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks gem 'turbolinks' # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates the API under doc/api. gem 'sdoc', '~> 0.4.0', group: :doc # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring gem 'spring', group: :development # Use ActiveModel has_secure_password # gem 'bcrypt', '~> 3.1.7' # Use unicorn as the app server # gem 'unicorn' # Use Capistrano for deployment # gem 'capistrano-rails', group: :development # Use debugger # gem 'debugger', group: [:development, :test] 

使用bundler管理gem。 安装的轨道gem是：

 sergey@sergey-VirtualBox:~/Bookmarks$ bundle update Fetching gem metadata from https://rubygems.org/.......... Fetching additional metadata from https://rubygems.org/.. Resolving dependencies... Using rake 10.3.2 Using i18n 0.6.11 Using json 1.8.1 Using minitest 5.4.0 Using thread_safe 0.3.4 Using tzinfo 1.2.1 Using activesupport 4.1.0 Using builder 3.2.2 Using erubis 2.7.0 Using actionview 4.1.0 Using rack 1.5.2 Using rack-test 0.6.2 Using actionpack 4.1.0 Using mime-types 1.25.1 Using polyglot 0.3.5 Using treetop 1.4.15 Using mail 2.5.4 Using actionmailer 4.1.0 Using activemodel 4.1.0 Using arel 5.0.1.20140414130214 Using activerecord 4.1.0 Using bcrypt 3.1.7 Using bundler 1.6.2 Using coffee-script-source 1.7.1 Using execjs 2.2.1 Using coffee-script 2.3.0 Using thor 0.19.1 Using railties 4.1.0 Using coffee-rails 4.0.1 Using orm_adapter 0.5.0 Using warden 1.2.3 Using devise 3.2.4 Using hike 1.2.3 Using multi_json 1.10.1 Using jbuilder 2.1.2 Using jquery-rails 3.1.1 Using tilt 1.4.1 Using sprockets 2.11.0 Using sprockets-rails 2.1.3 Using rails 4.1.0 Using rdoc 4.1.1 Using sass 3.2.19 Using sass-rails 4.0.3 Using sdoc 0.4.0 Using spring 1.1.3 Using sqlite3 1.3.9 Using turbolinks 2.2.2 Using uglifier 2.5.1 Your bundle is updated! 

我知道这里有一个相同错误的问题（即使是类似的版本） 为Ruby on Rails设计gem安装

但没有答案，我试图提供更多信息。

我也尝试了这个答案，没有效果。

你能帮帮我吗？

Answer 1

最近我回到了使用devisegem并解决它的问题。 最有可能是依赖性问题。

不幸的是我不知道到底出了什么问题，因为我只是卸载了所有可能对我的Ruby安装及其gems依赖性造成任何影响的东西，并重新安装了所有。

首先，我删除了我的试用版应用程序，以便在适当的环境下进一

然后我按照本指南准备干净的Ubuntu for Ruby安装和安装Ruby本身（从删除Ubuntu的旧rvm和ruby ）。

这是一个安装rails的指南 ，但它足以让gem install rails 。

要使用新的Ruby on Rails环境重新创建我的试用版应用程序，我仍然遵循本指南 （与问题相同）。

这个时间命令：

 rails g devise:install 

工作得很好。

此外，我对进一步的指导说明没有任何问题。