Ruby on rails 安装active admin-rails 3.0.3-未初始化常量Formtastic:：SemanticFormHelper时出现问题

我正在尝试将activeadmin添加到我的rails 3.0.3应用程序中

我按照指示去做

当我运行-rakedb:migrate时，我得到以下错误-

rake aborted!
uninitialized constant Formtastic::SemanticFormHelper
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/namespace.rb:167:in `eval'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/resource_controller.rb:1:in `<top (required)>'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/dashboards/dashboard_controller.rb:3:in `<module:Dashboards>'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/dashboards/dashboard_controller.rb:2:in `<module:ActiveAdmin>'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/dashboards/dashboard_controller.rb:1:in `<top (required)>'
(eval):1:in `generate_dashboard_controller'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/namespace.rb:167:in `eval'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/namespace.rb:167:in `generate_dashboard_controller'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin/namespace.rb:38:in `initialize'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:147:in `new'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:147:in `find_or_create_namespace'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:282:in `load_default_namespace'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:188:in `load!'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:212:in `routes'

rake中止！
未初始化常量Formtastic:：SemanticFormHelper
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/namespace.rb:167:in`eval'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/resource\u controller.rb:1:in`'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/dashboards/dashboard\u controller.rb:3:in`'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/dashboards/dashboard\u controller.rb:2:in`'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/dashboards/dashboard\u controller.rb:1:in`'
（评估）：1:在“生成仪表板控制器”中
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/namespace.rb:167:in`eval'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/namespace.rb:167:在“生成仪表板\u控制器”中
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin/namespace.rb:38:在“初始化”中
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:147:in“new”
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin.rb:147:“查找或创建”命名空间中
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active\u admin.rb:282:在“加载默认名称空间”中
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:188:in'load！'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/activeadmin-0.2.2/lib/active_admin.rb:212:在“路由”中

您似乎缺少

formtastic

宝石。在当前版本的active admin（0.3.2）中，它被正确指定为依赖项

因此，我希望更新activeadmin gem（

bundle update activeadmin

）可以解决这个问题

如果这不能解决问题，我会将

formtastic

显式添加到

Gemfile

---

希望这有帮助。

在rails 3中，Formtastic:：SemanticFormHelper变成了=>Formtastic:：Helpers:：FormHelper

别忘了加载你的库。默认情况下，rails不会加载它们，因此您可以在application.rb中取消注释config.autoload\u路径+=%W（#{config.root}/lib）