为 Ruby on Rails 设计 gem install答案

【问题标题】：devise gem install for Ruby on Rails为 Ruby on Rails 设计 gem install
【发布时间】：2014-11-24 09:54:16
【问题描述】：

刚开始学习 Ruby on Rails，我正在尝试安装用于创建登录/登录课程的设计 gem，但我不断收到以下消息..

有人可以帮忙吗？并随时纠正我的提问方式。这个社区的新手，很想参与其中。

alexs-air:pinteresting alexkwon$ rails generate devise:install
/Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activerecord-4.1.1/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 /Users/alexkwon/Desktop/pinteresting/app/models/install.rb:4:in `<class:Install>'
    from /Users/alexkwon/Desktop/pinteresting/app/models/install.rb:1:in `<top (required)>'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:443:in `load'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:443:in `block in load_file'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:633:in `new_constants_in'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:442:in `load_file'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:342:in `require_or_load'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:480:in `load_missing_constant'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:180:in `const_missing'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:238:in `const_get'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:238:in `block in constantize'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:236:in `each'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:236:in `inject'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/inflector/methods.rb:236:in `constantize'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:552:in `get'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:583:in `constantize'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise.rb:297:in `get'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:77:in `to'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:72:in `modules'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:89:in `routes'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:156:in `default_used_route'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/mapping.rb:66:in `initialize'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise.rb:331:in `new'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise.rb:331:in `add_mapping'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/rails/routes.rb:221:in `block in devise_for'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:in `each'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:in `devise_for'
    from /Users/alexkwon/Desktop/pinteresting/config/routes.rb:2:in `block in <top (required)>'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.1/lib/action_dispatch/routing/route_set.rb:335:in `instance_exec'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.1/lib/action_dispatch/routing/route_set.rb:335:in `eval_block'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.1/lib/action_dispatch/routing/route_set.rb:313:in `draw'
    from /Users/alexkwon/Desktop/pinteresting/config/routes.rb:1:in `<top (required)>'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:241:in `load'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:241:in `block in load'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:232:in `load_dependency'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:241:in `load'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:40:in `each'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:40:in `load_paths'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:16:in `reload!'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:26:in `block in updater'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/file_update_checker.rb:75:in `call'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/file_update_checker.rb:75:in `execute'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:27:in `updater'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application/finisher.rb:71:in `block in <module:Finisher>'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:30:in `instance_exec'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:30:in `run'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `call'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
    from /Users/alexkwon/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:54:in `run_initializers'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application.rb:288:in `initialize!'
    from /Users/alexkwon/Desktop/pinteresting/config/environment.rb:5:in `<top (required)>'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:247:in `require'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:247:in `block in require'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:232:in `load_dependency'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/dependencies.rb:247:in `require'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application.rb:264:in `require_environment!'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:147:in `require_application_and_environment!'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:133:in `generate_or_destroy'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:51:in `generate'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /Users/alexkwon/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:8:in `require'
    from bin/rails:8:in `<main>'

【问题讨论】：

您是否通过捆绑程序安装了devise？您可能必须在命令前使用bundle exec …。
关注这个：guides.railsgirls.com/devise
运行 rails g 以查看可用生成器的列表。设计应该在该列表中。如果没有，您仍然需要将gem devise 添加到您的Gemfile。

标签： ruby-on-rails ruby gem rubygems

【解决方案1】：

欢迎来到 Rails。

我知道社区正在全力以赴。事实上，Devise 是一款高级身份验证应用程序，堪称瑰宝。

如果您正在学习并且需要身份验证，某个名叫 Ryan Bates 的超级极客为您提供了有关基本身份验证的教程和截屏视频，它们将完全按照您的需要工作，并且您将了解发生了什么：

http://railscasts.com/episodes/250-authentication-from-scratch

哇！

请注意基于 rails 3。如果您在遵循指示时遇到问题，请检查 rails 和 ruby 版本之间的差异。如果您确实遇到错误，那么这条路径将让您进一步部署您的应用程序。

当您需要它提供的功能时，请回到 Devise，Rails，并确信您可以实现 José Valim 的“Crafting Rails 应用程序”一书中的想法。他是 Devise 的主要贡献者之一，因此您将深入了解他的思维过程。

【讨论】：