Monkey patch of the Hash class to convert all string keys to symbols at arbritray depth

symogrify.rb

require "minitest/autorun"
class Hash
  def symogriform
    symogriformed = {}
    symogrified = self
    symogrified.keys.each do |key|
      if symogrified[key].is_a?(Hash)
        symogrified[key] = symogrified[key].symogriform
      end
    end
    symogriformed.merge!(symogrify(symogrified))
    symogriformed
  end

  def symogrify part
    part.keys.inject({}){|hash, key| hash.merge({symog(key) => part[key]})}
  end

  def symog key
    key.is_a?(String) ? key.to_sym : key
  end
end

describe Hash do
  describe "symogriform" do
    it "should convert keys to symbols" do
      {"A" => :a, "B" => :b}.symogriform.must_equal({A: :a, B: :b}) 
    end

    it "should convert keys at arbitrary layers to symbols" do
      {"A" => {"A" => "a"}, "B" => {"B" => {"C" => {}}}}.symogriform.must_equal({A: {A: "a"}, B: {B: {C: {}}}})
    end

    it "should not error out with non-string keys" do
      {1 => "a", 2 => "a"}.symogriform.must_equal({1 => "a", 2 => "a"})
    end
  end
end