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

You can also extend core Hash ruby class placing a /lib/hash.rb file :

class Hash
  def symbolize_keys_deep!
    new_hash = {}
    keys.each do |k|
      ks    = k.respond_to?(:to_sym) ? k.to_sym : k
      if values_at(k).first.kind_of? Hash or values_at(k).first.kind_of? Array
        new_hash[ks] = values_at(k).first.send(:symbolize_keys_deep!)
      else
        new_hash[ks] = values_at(k).first
      end
    end

    new_hash
  end
end

If you want to make sure keys of any hash wrapped into arrays inside your parent hash are symbolized, you need to extend also array class creating a "array.rb" file with that code :

class Array
  def symbolize_keys_deep!
    new_ar = []
    self.each do |value|
      new_value = value
      if value.is_a? Hash or value.is_a? Array
        new_value = value.symbolize_keys_deep!
      end
      new_ar << new_value
    end
    new_ar
  end
end

This allows to call "symbolize_keys_deep!" on any hash variable like this :

myhash.symbolize_keys_deep!