如何使用符号键将对象转换为哈希数组 [英] How to convert Object to array of hashes with symbol keys

问题描述

我正在尝试:

Product.first.attributes.map{|k, v| "#{k.to_sym} => #{v}"}

但是，我收到的输出如下:

However, I receive the output as follows:

["id => 53", "name = blah"], ["id => 54", "name = blahblah"]

我想要的是:

[{:id=>53,:name=>"blah"}, {:id=>54,:name=>"blahblah"}]

推荐答案

看起来您只是想将Product.first.attributes哈希转换为带有键而不是字符串的符号的哈希.您可以通过调用 symbolize_keys Rails(实际上是ActiveSupport)已修补到Hash中:

Looks like you're just trying to convert the Product.first.attributes Hash to a Hash with symbols for keys rather than strings. You can make it easy on yourself by calling the symbolize_keys that Rails (ActiveSupport actually) has patched into Hash:

h = Product.first.attributes.symbolize_keys

---

当你这样说的时候:

---

When you say this:

"#{k.to_sym} => #{v}"

您只是生成一个看起来像哈希的字符串，并且并不是非常有用.如果您想长期使用键来符号化，您可能会使用以下方法生成一个数组数组:

you're just producing a string that looks sort of like a Hash and that's not terribly useful. If you want to symbolize the keys the long way, you'd probably produce an array of arrays using:

...map { |k, v| [ k.to_sym, v ] }

，然后将整个内容输入 Hash[] :

and then feed that whole thing to Hash[]:

h = Hash[Product.first.attributes.map { |k, v| [ k.to_sym, v ] }]

我不会打扰所有噪音，只需使用symbolize_keys并继续处理更有趣的问题即可.

I wouldn't bother with all that noise though, just use symbolize_keys and move on to more interesting problems.

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