无法生成cancan：能力
在ruby on rails gemfile中我添加了gem’cancancan’，’〜> 1.10’，然后运行bundle install并在之后使用rails g cancan：ability。
这是我在我的控制台中得到的
Running via Spring preloader in process 3455 Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--jbuilder'; got true (boolean) Expected boolean default value for '--markerb'; got :erb (string) Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--helper'; got true (boolean) Expected string default value for '--assets'; got true (boolean) Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--test-framework'; got false (boolean) Expected string default value for '--test-framework'; got false (boolean) Could not find generator 'cancan:ability'. Maybe you meant 'channel', 'coffee:assets' or 'css:assets' Run `rails generate --help` for more options. 运行’spring stop’命令并解决了问题。