ruby-1.9.2-p180 :007 > a = {:a => 10, :b => 20}
=> {:a=>10, :b=>20}
ruby-1.9.2-p180 :008 > a.reverse_merge({:c => 30})
NoMethodError: undefined method `reverse_merge' for {:a=>10, :b=>20}:Hash
from (irb):8
from /home/sayuj/.rvm/rubies/ruby-1.9.2-p180/bin/irb:16:in `<main>'
如何修复此问题NoMethodError
?Ruby - NoMethodError:undefined方法`reverse_merge'
404。 –
http://api.rubyonrails.org/v2.3.8/classes/ActiveSupport/CoreExtensions/Hash/ReverseMerge.html – kp666
编辑您的答案以修复网址。 –