升级到ruby 2.3.0 NameError：uninitialized constant I18n :: Config :: Backend
我刚刚将Ruby 2.2.2升级到2.3.0。 每当我运行rake任务时，我都会收到以下错误：
Christians-Air:my_rails_app cman77$ rake --trace rake aborted! NameError: uninitialized constant I18n::Config::Backend /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/i18n-0.7.0/lib/i18n/config.rb:19:in `backend' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/i18n-0.7.0/lib/i18n.rb:147:in `translate' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/actionview-4.2.6/lib/action_view/helpers/translation_helper.rb:69:in `translate' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/i18n-0.7.0/lib/i18n/config.rb:19:in `backend' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/i18n-0.7.0/lib/i18n.rb:147:in `translate' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/actionview-4.2.6/lib/action_view/helpers/translation_helper.rb:69:in `translate' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/engine.rb:658:in `block in run_tasks_blocks' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/engine.rb:658:in `each' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/engine.rb:658:in `run_tasks_blocks' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/application.rb:452:in `run_tasks_blocks' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/engine.rb:453:in `load_tasks' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/railtie.rb:194:in `public_send' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/railties-4.2.6/lib/rails/railtie.rb:194:in `method_missing' /Users/cman77/Dropbox/rails_projects/my_rails_app/Rakefile:9:in `' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/rake_module.rb:28:in `load' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/rake_module.rb:28:in `load_rakefile' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:689:in `raw_load_rakefile' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:94:in `block in load_rakefile' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:176:in `standard_exception_handling' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:93:in `load_rakefile' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:77:in `block in run' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:176:in `standard_exception_handling' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/lib/rake/application.rb:75:in `run' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/gems/rake-11.1.2/bin/rake:33:in `' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/bin/rake:23:in `load' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/bin/rake:23:in `' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/bin/ruby_executable_hooks:15:in `eval' /Users/cman77/.rvm/gems/ruby-2.3.0@jbio.3.0/bin/ruby_executable_hooks:15:in `' 有人有这方面的经验吗？ 我真的陷入了如何开始诊断/解决这个问题的困境。
这是我的Rakefile的内容：
#!/usr/bin/env rake # Add your own tasks in files placed in lib/tasks ending in .rake, # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake. require File.expand_path('../config/application', __FILE__) ENV['NEWRELIC_ENABLE'] = 'false' MyRailsApp::Application.load_tasks
这似乎是I18n gem中引用的违规行： https ： //github.com/svenfuchs/i18n/blob/master/lib/i18n/config.rb#L18
更新 ：它似乎与我的一个rake文件中include ActionView::Helpers::TranslationHelper的使用有关。 如果我删除该行，我可以运行rake命令。
Update2 ：删除include ActionView::Helpers::TranslationHelper并用(I18n.t "some_text")替换(t "some_text") (I18n.t "some_text")完全解决了这个问题。 我还是会给那些可以解释为什么会破坏Ruby升级的人奖励！
我的猜测是你遇到了这个问题，因为你在rake任务中使用了t方法（控制器和视图的助手），而不是标准的I18n.t
这是一种不常见且非传统的方法，所以你已经陷入了一种可能的回归， 很少有人经历过，而且它有一个简单的解决方案，就像你找到的那样：坚持惯例。