How do I convert a Ruby hash so that all of its keys are symbols?

Question

I have a Ruby hash which looks like:

{ \"id\" => \"123\", \"name\" => \"test\" }

I would like to convert it to:

{ :id         


        

Answer 1

Victor Moroz provided a lovely answer for the simple recursive case, but it won't process hashes that are nested within nested arrays:

hash = { "a" => [{ "b" => "c" }] }
s2s[hash] #=> {:a=>[{"b"=>"c"}]}

If you need to support hashes within arrays within hashes, you'll want something more like this:

def recursive_symbolize_keys(h)
  case h
  when Hash
    Hash[
      h.map do |k, v|
        [ k.respond_to?(:to_sym) ? k.to_sym : k, recursive_symbolize_keys(v) ]
      end
    ]
  when Enumerable
    h.map { |v| recursive_symbolize_keys(v) }
  else
    h
  end
end