Ruby how to parse a Json file with Array keys

Question

I'm trying to get a Hash from a Json file that has Array Keys, but its return each array key like string.

hash = {[10, 10] => [[1, 1], [5, 5]]}
p JSON.parse(hash.to_json) #=> {"[10, 10]" => [[1, 1], [5, 5]]}

Maybe i should use YAML, any idea?

Are your keys arbitrary arrays or are they always arrays of integers? Looks like #to_json is calling [10,10].to_s to stringify the key before encoding it to JSON. I don't think YAML will help. Marshal won't help either, that's not a good serialization format as it depends on the Ruby version. I'd guess that you're going to end up with some custom format (even if it means double encoding by calling [10,10].to_json to stringify the key before JSON encoding the hash, i.e. JSON inside your JSON). — mu is too short
– mu is too short, Commented Dec 8, 2019 at 9:52
YAML works very well, returning the hash correctly. I really don't figure out how to use this [10,10].to_json, i think it's the same effect and about Marshal i agree with you. — Andrek
– Andrek, Commented Dec 8, 2019 at 10:14
Nice, didn't know YAML would do that. You should put that down as an answer and accept it. — mu is too short
– mu is too short, Commented Dec 8, 2019 at 19:24
Well, YAML is not JSON so there is not a correct answer, i think @jörgwmittag answer is the correct but the solution for me was to use YAML. — Andrek
– Andrek, Commented Dec 8, 2019 at 20:44

Community · Accepted Answer · 2021-10-07 10:53:52Z

3

There are three slightly different versions JSON, as specified by

While there are small differences between the three, one thing they all agree on: Object Keys are Strings. Always.

In other words, "a Json file that has Array Keys" cannot possibly exist. Whatever you have, it is either a JSON file, but then it cannot have Array Keys, or it is simply not a JSON file.

edited Oct 7, 2021 at 10:53

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answered Dec 8, 2019 at 9:24

Jörg W Mittag

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1 Comment

Andrek Over a year ago

I'm just saving a my own hash, because Marshal sometimes it gets corrupted and i could never solve it

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