我有一个格式的哈希：
{key1 => [a,b,c],key2 => [d,e,f]}
我想最终得到：
{ a => key1,b => key1,c => key1,d => key2 ... }
实现这一目标的最简单方法是什么？
我正在使用Ruby on Rails.
UPDATE
好吧,我设法从服务器日志中提取真实对象,它是通过AJAX推送的.
Parameters: {"status"=>{"1"=>["1","14"],"2"=>["7","12","8","13"]}}
解决方法
hash = {:key1 => ["a","b","c"],:key2 => ["d","e","f"]}
第一个变种
hash.map{|k,v| v.map{|f| {f => k}}}.flatten
#=> [{"a"=>:key1},{"b"=>:key1},{"c"=>:key1},{"d"=>:key2},{"e"=>:key2},{"f"=>:key2}]
要么
hash.inject({}){|h,(k,v)| v.map{|f| h[f] = k}; h}
#=> {"a"=>:key1,"b"=>:key1,"c"=>:key1,"d"=>:key2,"e"=>:key2,"f"=>:key2}
UPD
好的,你的哈希是：
hash = {"status"=>{"1"=>["1","13"]}}
hash["status"].inject({}){|h,v)| v.map{|f| h[f] = k}; h}
#=> {"12"=>"2","7"=>"2","13"=>"2","8"=>"2","14"=>"1","1"=>"1"}