Flatten a nested hash in Ruby on Rails

Question

I have a hash in the structure below

{
    "Result": [
        {
            "Links": [
                {
                    "UrlTo": "http://www.example.com/",
                    "Visited": 1365128454,
                    "FirstSeen": 1351907446,
                }
            ],
            "Index": 0,
            "Rating": 120.969674
        }
    ]
}

But I want it flattened and to look as it does below. So I want to move the links hash up a level so it is no longer multidimensional. What is the easiest way of accomplishing this? can i used something like .flatten?

{
    "Result": [
        {
            "UrlTo": "http://www.example.com/",
            "Visited": 1365128454,
            "FirstSeen": 1351907446,
            "Index": 0,
            "Rating": 120.969674
        }
    ]
}

Many thanks

I want to move everything that "Links" contains up a level in to the hash above it — Max Rose-Collins, May 11 '13 at 13:53
That is what you should have written in the question from the beginning. By the way, is that supposed to be json? If so, shouldn't that be handled by JavaScript or something? Why is Ruby relevant? — sawa, May 11 '13 at 13:54
Use a combination of Array `flatten`, Hash `assoc`, and Hash[]. In the general case, you'll need a recursive function. — lurker, May 11 '13 at 13:57
@byterussian it is { "Result"=>[{ "Links"=>[{ "UrlTo"=>"http://www.example.com/", "Visited"=>1365128454 }], "Index"=>0, "Rating"=>120.969674 }] } — Max Rose-Collins, May 11 '13 at 14:54

FMc · Accepted Answer · 2013-05-11T15:57:44.030

4

data = { ... }

h = data['Result'].first
h.merge!(h.delete('Links').first)

edited May 11 '13 at 15:57

answered May 11 '13 at 15:35

FMc

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Flatten a nested hash in Ruby on Rails

1 Answers1