使用Ruby将SQL结果转换为具有ID键的哈希表

Question

我有以下数组（SQL结果）：

[
  {:id => 1, :field1 => "one", :field2 => "two"},
  {:id => 2, :field1 => "one", :field2 => "two"},
  ...
]

What I want is:

{
  1 => {:field1 => "one", :field2 => "two"},
  2 => {:field1 => "one", :field2 => "two"},
  ...
}

现在我喜欢以下内容：

data = {}
result.each do |row|
  data[row[:id]] = {:field1 => row[:field1], :field2 => row[:field2]}
end

我非常确定那是错误的方式。用Ruby做这件事，最好的方法是什么？是否有任何类似于map的代码片段可以使用？

- odiszapc

Answer 1

Hash[arr.map { |h| [h.delete(:id), h] }]

- hs-

Answer 2

一行 :)

hash = arr.clone.each_with_object({}) { |e,res| res[e.delete(:id)] = e }

clone 是为了不破坏 arr 变量而存在的。

- megas

---

一行？你能用0行完成吗？ - odiszapc

Answer 3

类似这样的东西，也许可以吗？

arr = [
  {:id => 1, :field1 => "one", :field2 => "two"},
  {:id => 2, :field1 => "one", :field2 => "two"}
]

hash = arr.each_with_object({}) do |el, memo|
  id = el.delete(:id)
  memo[id] = el
end

hash # => {1=>{:field1=>"one", :field2=>"two"}, 2=>{:field1=>"one", :field2=>"two"}}

- Sergio Tulentsev