【发布时间】：2014-03-09 21:38:11
【问题描述】：
我按照 http://www.activeadmin.info/docs/0-installation.html#gemfile 标题下的说明向 Active Admin 注册您的模型。在添加 Post 的资源之前，我能够很好地启动我的服务器。一旦我添加了 Post 的资源，它将不再启动。它给了我一个关于需要将 I18n.config.enforce_available_locales 设置为 false 以防止出现错误消息的错误。我发现另一个 Stack Overflow 帖子说在 application.rb 文件中将其设置为 false。执行此操作后，消息不再显示在我的终端界面中，但服务器未启动。
现在当我运行 $ rails server 时，我在终端中得到以下输出
/Applications/MAMP/htdocs/ruby-review/app/admin/post.rb:1:in `<top (required)>': uninitialized constant Post (NameError)
from /Library/Ruby/Gems/2.0.0/bundler/gems/active_admin-9ca081f47ab4/lib/active_admin/application.rb:179:in `load'
from /Library/Ruby/Gems/2.0.0/bundler/gems/active_admin-9ca081f47ab4/lib/active_admin/application.rb:171:in `block in load!'
from /Library/Ruby/Gems/2.0.0/bundler/gems/active_admin-9ca081f47ab4/lib/active_admin/application.rb:171:in `each'
from /Library/Ruby/Gems/2.0.0/bundler/gems/active_admin-9ca081f47ab4/lib/active_admin/application.rb:171:in `load!'
from /Library/Ruby/Gems/2.0.0/bundler/gems/active_admin-9ca081f47ab4/lib/active_admin/application.rb:195:in `routes'
from /Library/Ruby/Gems/2.0.0/bundler/gems/active_admin-9ca081f47ab4/lib/active_admin.rb:80:in `routes'
from /Applications/MAMP/htdocs/ruby-review/config/routes.rb:3:in `block in <top (required)>'
from /Library/Ruby/Gems/2.0.0/gems/actionpack-4.0.3/lib/action_dispatch/routing/route_set.rb:341:in `instance_exec'
from /Library/Ruby/Gems/2.0.0/gems/actionpack-4.0.3/lib/action_dispatch/routing/route_set.rb:341:in `eval_block'
from /Library/Ruby/Gems/2.0.0/gems/actionpack-4.0.3/lib/action_dispatch/routing/route_set.rb:319:in `draw'
from /Applications/MAMP/htdocs/ruby-review/config/routes.rb:1:in `<top (required)>'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:40:in `each'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.0.3/lib/active_support/file_update_checker.rb:75:in `call'
from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.0.3/lib/active_support/file_update_checker.rb:75:in `execute'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:27:in `updater'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/routes_reloader.rb:6:in `execute_if_updated'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:30:in `instance_exec'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:30:in `run'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:55:in `block in run_initializers'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:180:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:54:in `run_initializers'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/application.rb:215:in `initialize!'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/railtie/configurable.rb:30:in `method_missing'
from /Applications/MAMP/htdocs/ruby-review/config/environment.rb:5:in `<top (required)>'
from /Applications/MAMP/htdocs/ruby-review/config.ru:3:in `block in <main>'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
from /Applications/MAMP/htdocs/ruby-review/config.ru:in `new'
from /Applications/MAMP/htdocs/ruby-review/config.ru:in `<main>'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/builder.rb:49:in `new_from_string'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/builder.rb:40:in `parse_file'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/server.rb:199:in `app'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/commands/server.rb:48:in `app'
from /Library/Ruby/Gems/2.0.0/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/commands/server.rb:75:in `start'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:76:in `block in <top (required)>'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:71:in `tap'
from /Library/Ruby/Gems/2.0.0/gems/railties-4.0.3/lib/rails/commands.rb:71:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
如何初始化 Post 的常量？
如果这些错误对某些人来说很明显，我深表歉意。我对 Rails 还是很陌生。
【问题讨论】：
标签： ruby-on-rails ruby ruby-on-rails-4 activeadmin