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当我运行 mongo3 后运行gem install mongo3. 我遇到了以下问题

F, [2013-05-08T20:35:18.376873 #8487] FATAL -- : undefined method `helpers' for CollectionHelper:Module (NoMethodError)
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/helpers/collection_helper.rb:15:in `<module:CollectionHelper>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/helpers/collection_helper.rb:14:in `<top (required)>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/mongo3.rb:49:in `load'
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1 回答 1

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目前的解决方法（来自 github 讨论）是使用较旧的 sinatra。

gem uninstall sinatra 
gem install sinatra -v 1.3.3
于 2013-06-11T17:19:50.930 回答