在Ruby / Rails中处理多级哈希

Question

I'm requesting data from an API that returns a multi-level hash in a rails app. I need to access information at different points in the API response, so I have code like this in my view:

<%= @api_response["Hash 1"]["Hash 2"]["Hash 3"]["value"] %>

In the same view file I might have something like:

<%= @api_response["Hash 1"]["value"] %>

Is this an acceptable way to deal with an large hash from an API response? Or is there a better way this could be handled?

Answer 1

您可以看一下递归开放结构gem ，它允许像方法一样访问哈希，而且也更清洁。

Answer 2

Since Ruby 2.3.0, Ruby now natively supports this with Hash#dig . From the documentation:

h = { foo: {bar: {baz: 1}}}

h.dig(:foo, :bar, :baz)           #=> 1
h.dig(:foo, :zot, :xyz)           #=> nil

g = { foo: [10, 11, 12] }
g.dig(:foo, 1)                    #=> 11

---

Another, more convenient example usage:

hpath = %i[foo bar baz]
h.dig(*hpath)                     #=> 1