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由 yuuji.yaginuma 提交于
`Class#descendants` has already been displayed in Rails guide, so I think that may be displayed in doc. http://guides.rubyonrails.org/active_support_core_extensions.html#descendants
951353e4
`Class#descendants` has already been displayed in Rails guide, so I think that may be displayed in doc. http://guides.rubyonrails.org/active_support_core_extensions.html#descendants