ruby-on-rails - 错误 "' Validate_default_type !': An option' s default must match its type (ArgumentError)"when running Ruby on Rails generate on Windows

Question

我正在关注 this tutorial并且刚刚开始。我已经使用 gem install rails 安装了 Ruby on Rails，并使用 rails new blog 创建了一个博客。

教程现在说我需要运行 rails generate controller Welcome index，但是当我这样做时，我得到了这个错误:

C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/parser/option.rb:130:in `validate_default_type!': An option's default must match its type. (ArgumentError)
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/parser/option.rb:113:in `validate!'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/parser/argument.rb:24:in `initialize'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/parser/option.rb:9:in `initialize'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/base.rb:544:in `new'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/base.rb:544:in `build_option'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/thor-0.19.2/lib/thor/base.rb:278:in `class_option'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/generators/base.rb:202:in `class_option'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/generators/base.rb:178:in `block in hook_for'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/generators/base.rb:168:in `each'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/generators/base.rb:168:in `hook_for'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/jbuilder-2.6.0/lib/generators/rails/scaffold_controller_generator.rb:9:in `<class:ScaffoldControllerGenerator>'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/jbuilder-2.6.0/lib/generators/rails/scaffold_controller_generator.rb:6:in `<module:Generators>'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/jbuilder-2.6.0/lib/generators/rails/scaffold_controller_generator.rb:5:in `<module:Rails>'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/jbuilder-2.6.0/lib/generators/rails/scaffold_controller_generator.rb:4:in `<top (required)>'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/jbuilder-2.6.0/lib/jbuilder/railtie.rb:32:in `block in <class:Railtie>'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/railtie.rb:230:in `call'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/railtie.rb:230:in `block in run_generators_blocks'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/railtie.rb:247:in `each'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/railtie.rb:247:in `each_registered_block'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/railtie.rb:230:in `run_generators_blocks'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/application.rb:453:in `block in run_generators_blocks'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/engine/railties.rb:13:in `each'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/engine/railties.rb:13:in `each'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/application.rb:453:in `run_generators_blocks'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/engine.rb:465:in `load_generators'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:144:in `generate_or_destroy'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:60:in `generate'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
    from C:/Ruby22/lib/ruby/gems/2.2.0/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

我在 Stack Overflow 上发现了一个类似的问题，询问同样的问题 here , 但当被要求显示他的 gem list 时，发布者从未回应。所以这是我的:

actioncable (5.0.0.1)
actionmailer (5.0.0.1)
actionpack (5.0.0.1)
actionview (5.0.0.1)
activejob (5.0.0.1)
activemodel (5.0.0.1)
activerecord (5.0.0.1)
activesupport (5.0.0.1)
arel (7.1.4)
bigdecimal (1.2.7, default: 1.2.6)
builder (3.2.2)
bundler (1.13.6)
coffee-rails (4.2.1)
coffee-script (2.4.1)
coffee-script-source (1.11.1)
concurrent-ruby (1.0.2)
debug_inspector (0.0.2)
erubis (2.7.0)
execjs (2.7.0)
globalid (0.3.7)
i18n (0.7.0)
io-console (0.4.6, default: 0.4.3)
jbuilder (2.6.0)
jquery-rails (4.2.1)
json (2.0.2, default: 1.8.1)
loofah (2.0.3)
mail (2.6.4)
method_source (0.8.2)
mime-types (3.1)
mime-types-data (3.2016.0521)
mini_portile2 (2.1.0)
minitest (5.9.1, 5.4.3)
multi_json (1.12.1)
nio4r (1.2.1)
nokogiri (1.6.8.1 x86-mingw32)
power_assert (0.3.1, 0.2.2)
psych (2.2.0, default: 2.0.8)
puma (3.6.2)
rack (2.0.1, 1.6.4)
rack-protection (1.5.3)
rack-test (0.6.3)
rails (5.0.0.1)
rails-dom-testing (2.0.1)
rails-html-sanitizer (1.0.3)
railties (5.0.0.1)
rake (11.3.0, default: 10.4.2)
rdoc (5.0.0, default: 4.2.0)
sass (3.4.22)
sass-rails (5.0.6)
sinatra (1.4.7)
sprockets (3.7.0)
sprockets-rails (3.2.0)
sqlite3 (1.3.12 x86-mingw32)
test-unit (3.2.3, 3.0.8)
thor (0.19.2, 0.19.1)
thread_safe (0.3.5)
tilt (2.0.5)
turbolinks (5.0.1)
turbolinks-source (5.0.0)
tzinfo (1.2.2)
tzinfo-data (1.2016.10)
uglifier (3.0.3)
web-console (3.4.0)
websocket-driver (0.6.4)
websocket-extensions (0.1.2)

有没有人遇到过这个错误？如果有，您是如何解决的？

Answer 1

临时修复是将您的 gemfile 中的 Thor 版本设置为最新版本。

gem 'thor', '0.19.1'

似乎最新的 gem 版本破坏了它。修复后，此错误应该会消失。

对于任何在创建新的 Ruby on Rails 应用程序或其他类似中间人时遇到问题的人，您可以卸载 Thor 并专门安装旧版本:

gem uninstall thor
gem install thor -v 0.19.1