'-' changed to '_' while converting xml to hash in rails

Question

xml = "<outer-tag><inner-tag>value</inner-tag></outer-tag>"

hash = Hash.from_xml(xml) ==> this gives me the following output

{"outer_tag"=>{"inner_tag"=>"value"}}

I actually need hash = {"outer-tag"=>{"inner-tag"=>"value"}}

Is there any way to convert XML to Hash without changing "-" to "_" ?

Answer 1

Let check source code at line 164. Rails normalizes the hash keys from - to _

So, I come up with 2 solutions:

1. Call rails private method

   xml = "<outer-tag><inner-tag>value</inner-tag></outer-tag>"
   hash = ActiveSupport::XmlMini.parse(xml)
   result = ActiveSupport::XMLConverter.new("").send(:deep_to_h, hash)
   

This is risky since rails may have an internal changes and we are in error-prone

2. Convert key from _ back to -

   xml = "<outer-tag><inner-tag>value</inner-tag></outer-tag>"
   hash = Hash.from_xml(xml)
   normalize_keys = -> (params) do
     case params
       when Hash
         Hash[params.map { |k,v| [k.to_s.tr('_', '-'), normalize_keys.call(v)] } ]
       when Array
         params.map { |v| normalize_keys.call(v) }
       else
         params
     end
   end
   result = normalize_keys.call(hash)
   

This is better, but too much longer, just my idea, welcome any comment!