设计生成视图错误

Question

我遇到了 devise gem 问题，当我输入 railsgenerate devise:install 命令时出现错误：

/home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/inflector/methods.rb:124:in `block in constantize': unin
itialized constant View (NameError)
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/inflector/methods.rb:123:in `each'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/inflector/methods.rb:123:in `constantize'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/core_ext/string/inflections.rb:43:in `const
antize'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise/mapping.rb:87:in `to'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise/mapping.rb:80:in `modules'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise/mapping.rb:93:in `strategies'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise.rb:166:in `register'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise/rails/routes.rb:92:in `block in devise_for'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise/rails/routes.rb:91:in `each'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/devise-1.1.rc1/lib/devise/rails/routes.rb:91:in `devise_for'
        from /home/ofca/Praca/inzynierka/config/routes.rb:2:in `block in <top (required)>'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.1.1/lib/action_dispatch/routing/route_set.rb:258:in `instance_exec'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.1.1/lib/action_dispatch/routing/route_set.rb:258:in `eval_block'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.1.1/lib/action_dispatch/routing/route_set.rb:235:in `draw'
        from /home/ofca/Praca/inzynierka/config/routes.rb:1:in `<top (required)>'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `block in load_paths
'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `each'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:29:in `load_paths'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:13:in `reload!'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/routes_reloader.rb:7:in `block in initialize'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/file_update_checker.rb:32:in `call'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.1/lib/active_support/file_update_checker.rb:32:in `execute_if_up
dated'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/finisher.rb:63:in `block (2 levels) in <modul
e:Finisher>'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/finisher.rb:64:in `call'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application/finisher.rb:64:in `block in <module:Finisher>
'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/initializable.rb:30:in `instance_exec'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/initializable.rb:30:in `run'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/initializable.rb:55:in `block in run_initializers'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/initializable.rb:54:in `each'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/initializable.rb:54:in `run_initializers'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application.rb:96:in `initialize!'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from /home/ofca/Praca/inzynierka/config/environment.rb:5:in `<top (required)>'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application.rb:83:in `require'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/application.rb:83:in `require_environment!'
        from /home/ofca/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:22:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

我正在使用 Rails 3.1.1 和 Ruby 1.9。 Linux 上的 2p290（2011-07-09 修订版 32553）。 db是postgres。 这是错误日志第一行中提到的行：

constant = constant.const_defined?(name, false) ? constant.const_get(name) : constant.const_missing(name) 

哦，我尝试了此命令的其他组合：railsgeneratedevise:install,railsgdevise_install它给了我相同的效果

Answer 1

您正在使用非常旧的 Devise 版本，该版本甚至不适合在生产中使用（它是候选版本！）。请更新您的 Devise 版本。

Answer 2

解决方案：在gemfile中添加：

gem 'devise', :git => 'git://github.com/plataformatec/devise.git'