ruby-on-rails - 使用以下结构在 ruby​​ 中将 Array 转换为 Hash

Question

我有一个以下数组，显示用户信息和一些与用户相关的值。以下数组包含两个用户 Akiyo Riggs 和 Bingo 的信息

a1 = [["Akiyo Riggs", -32, "OverTime Hours", "",12],["Akiyo Riggs", -32, 
"Regular Hours", "", 18],["Bingo",-12,"OverTime Hours","",14], ["Bingo",
-12,"Regular Hours","",32]]

我如何转换成以下哈希数组，其中键是用户名，值是具有相应值的哈希

[{"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]},
{"Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}]

Answer 1

a1.map { |x,_,p,*ps| {x => {p => ps} } }.reduce({}, :deep_merge)
# => {"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]},
#     "Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}}

注意:如果考虑效率，请考虑使用 deep_merge! 而不是 deep_merge，这样 reduce 就不会在每次迭代。

一些解释:

a1.map { |x,_,p,*ps| {x => {p => ps} } }

给我们一个像这样的散列数组

 [{"Akiyo Riggs"=>{"OverTime Hours"=>["", 12]}},
  {"Akiyo Riggs"=>{"Regular Hours"=>["", 18]}},
  {"Bingo"=>{"OverTime Hours"=>["", 14]}},
  {"Bingo"=>{"Regular Hours"=>["", 32]}}]

我们可以递归地与 ActiveSupport 合并 Hash#deep_merge