Ruby hash to XML: How would I create duplicate keys in a hash for repeated XML xpaths?

Question

I have to create XML that looks something like this:

<?xml version="1.0" ?>
<FirstLevel>
  <Package>
    <Name></Name>
  </Package>
  <Package>
    <Name></Name>
  </Package>
  ...
</FirstLevel>

As you can see, Package shows up multiple times at the same level in the structure.

I know you can't have duplicate keys in a Ruby hash, so I don't know how I would be able to go from a hash to XML when there are duplicate keys. Does anyone have any ideas?

I'm using Hash#to_xml to convert my hash to XML (made available by ActiveSupport I believe).

By the way, I'm using Rails.

Also you can use nokogiri xml to use/access the xml.

Малъ Скрылевъ
– Малъ Скрылевъ

2014-01-10 16:59:25 +00:00
Commented Jan 10, 2014 at 16:59 — Малъ Скрылевъ
– Малъ Скрылевъ, Commented Jan 10, 2014 at 16:59

Community · Accepted Answer · 2017-05-23 10:34:08Z

3

Okay I believe I figured it out. You have to use Hash#compare_by_identity. I believe this makes it so that the key lookups are done using object id as opposed to string matches.

I found it in "Ruby Hash with duplicate keys?".

{}.compare_by_identity

    h1 = {}
    h1.compare_by_identity
    h1["a"] = 1
    h1["a"] = 2
    p h1 # => {"a"=>1, "a"=>2}

edited May 23, 2017 at 10:34

CommunityBot

11 silver badge

answered Jan 10, 2014 at 16:54

bigpotato

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