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我正在開發一個Rails引擎（目前使用Rails 4.1.6）。如何解決「NameError：未初始化的常量Thor :: Base」錯誤？
$ bundle exec rake app:db:migrate --trace
** Invoke load_app (first_time)
** Execute load_app
rake aborted!
NameError: uninitialized constant Thor::Base
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.7.3/lib/bundler/ui/shell.rb:12:in `initialize'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.7.3/lib/bundler/gem_helper.rb:26:in `new'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.7.3/lib/bundler/gem_helper.rb:26:in `initialize'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.7.3/lib/bundler/gem_helper.rb:13:in `new'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.7.3/lib/bundler/gem_helper.rb:13:in `install_tasks'
/Users/andrew/example_rails_engine/Rakefile:10:in `<top (required)>'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/rake_module.rb:28:in `load'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/rake_module.rb:28:in `load_rakefile'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:687:in `raw_load_rakefile'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:94:in `block in load_rakefile'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:93:in `load_rakefile'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:77:in `block in run'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/lib/rake/application.rb:75:in `run'
/Users/andrew/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/rake-10.3.2/bin/rake:33:in `<top (required)>'
/Users/andrew/.rbenv/versions/2.1.3/bin/rake:23:in `load'
/Users/andrew/.rbenv/versions/2.1.3/bin/rake:23:in `<main>'
我的Rakefile如下：：
begin
require 'bundler/setup'
rescue LoadError
puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
end
APP_RAKEFILE = File.expand_path("../spec/dummy/Rakefile", __FILE__)
load 'rails/tasks/engine.rake'
Bundler::GemHelper.install_tasks
此錯誤是沒有意義的，我當我嘗試運行任何Rake任務，我得到這個錯誤。我猜Thor是Rails Rake任務的依賴。這個錯誤來自哪裏，我該如何解決它？
'thor'是導軌的寶石生成器被寫入。但我並不真正瞭解發生了什麼。如果我用'rails plugin new some_engine'自己創建一個引擎，我可以成功運行'bundle exec rake app：db：migrate'。也許你添加了一些其他的代碼，但是沒有向我們展示，它正在觸發這個問題 - 雖然堆棧跟蹤並沒有真正給我們提供這方面的線索。嗯，神祕。我想知道你是否有某種方式使用不兼容的寶石版本。爲了確保你擁有所有寶石的最新版本，我會運行一個「軟件包更新」，但是我懷疑這無濟於事。 – jrochkind 2014-10-07 06:03:41
https://github.com/bundler/bundler/issues/2901 - 也許有關... – 2014-10-07 06:25:27
要麼做@jrochkind建議的，要麼嘗試在'Gemfile'中添加'thor' gem。 – 2014-10-07 13:06:32