Question

我理解哈希不应该有任何顺序，我想要做的是从许多不同的API收集数据然后对结果进行排序。我的哈希看起来像这样

hash = \ 
{{:train_id=>["DALY", "1"]}=>
  {0=>
    [{:train_no=>0,
      :arrival_station=>"MONT",
      :destination_departure_time=>"8",
      :destination=>"Pittsburg/Bay Point"}],
   1=>
    [{:train_no=>1,
      :arrival_station=>"MONT",
      :destination_departure_time=>"23",
      :destination=>"Pittsburg/Bay Point"}],
   2=>
    [{:train_no=>2,
      :arrival_station=>"MONT",
      :destination_departure_time=>"37",
      :destination=>"Pittsburg/Bay Point"}],
   3=>
    [{:train_no=>0,
      :arrival_station=>"POWL",
      :destination_departure_time=>"7",
      :destination=>"Pittsburg/Bay Point"}],
   4=>
    [{:train_no=>1,
      :arrival_station=>"POWL",
      :destination_departure_time=>"21",
      :destination=>"Pittsburg/Bay Point"}],
   5=>
    [{:train_no=>2,
      :arrival_station=>"POWL",
      :destination_departure_time=>"36",
      :destination=>"Pittsburg/Bay Point"}],
   6=>
    [{:train_no=>0,
      :arrival_station=>"CIVC",
      :destination_departure_time=>"5",
      :destination=>"Pittsburg/Bay Point"}],
   7=>
    [{:train_no=>1,
      :arrival_station=>"CIVC",
      :destination_departure_time=>"19",
      :destination=>"Pittsburg/Bay Point"}],
   8=>
    [{:train_no=>2,
      :arrival_station=>"CIVC",
      :destination_departure_time=>"34",
      :destination=>"Pittsburg/Bay Point"}],
   9=>
    [{:train_no=>0,
      :arrival_station=>"16TH",
      :destination_departure_time=>"17",
      :destination=>"Pittsburg/Bay Point"}],
   10=>
    [{:train_no=>1,
      :arrival_station=>"16TH",
      :destination_departure_time=>"32",
      :destination=>"Pittsburg/Bay Point"}]},

 {:train_id=>["DALY", "5"]}=>{}
}

我需要按以下方式排序：train_no和我使用时

sorted = hash.sort_by{|k,v| v[:train_no] }

我有时会收到错误

ArgumentError: comparison of Hash with Hash failed

这可能是因为其中一个值为null，如果它没有失败，它只返回相同的未排序的排序结果。

关于我做错的任何指导（除了使用哈希来存储我想要排序的东西）？

Ruby sort_by不工作，有时抛出ArgumentError：Hash与Hash的比较失败

0 个答案: