ruby - 参数错误 : comparison of Hash with Hash failed - Sorting an array of hashes by hash name

Question

我有以下数组:

names = [
{"Adriana"=>{:gender=>"female", :nationality=>"danish"}},
{"Adriane"=>{:gender=>"female", :nationality=>"danish"}},
{"Agatha"=>{:gender=>"female", :nationality=>"danish"}},
{"Adrianna"=>{:gender=>"female", :nationality=>"danish"}}
]

我如何根据每个哈希的名称对这个哈希数组进行排序？

我试过:names.sort!，它会抛出 ArgumentError: comparison of Hash with Hash failed。

Answer 1

只需使用 Enumerable#sort_by 执行以下操作方法。

names = [
{"Adriana"=>{:gender=>"female", :nationality=>"danish"}},
{"Adriane"=>{:gender=>"female", :nationality=>"danish"}},
{"Agatha"=>{:gender=>"female", :nationality=>"danish"}},
{"Adrianna"=>{:gender=>"female", :nationality=>"danish"}}
]

names.sort_by { |h| h.first.first }
# => [{"Adriana"=>{:gender=>"female", :nationality=>"danish"}},
#     {"Adriane"=>{:gender=>"female", :nationality=>"danish"}},
#     {"Adrianna"=>{:gender=>"female", :nationality=>"danish"}},
#     {"Agatha"=>{:gender=>"female", :nationality=>"danish"}}]