Camelize Keys

hash_decorator.rb

// Taken from https://github.com/rails-api/active_model_serializers/issues/398#issuecomment-26072287

class Hash
  def camelize_keys!
    update_keys!(:camelize, :lower)
  end

  def underscore_keys!
    update_keys!(:underscore)
  end

  def update_keys!(method, *args)
    self.keys.each do |key|
      updated_key = key.to_s.send(method, *args).to_sym
      self[updated_key] = self.delete(key)
      self[updated_key].update_keys!(method, *args) if self[updated_key].kind_of? Hash
    end
    self
  end
end

# Example in Rails environment:
#
# >> nested_hash = { :this_is_cool => '123', :so_is_this => { :level_two => 2, :oh_yeah => 'oh yeah', :another_level => {:level_three => 3, :okay_thats_enough => 'yeah, enough man'} }, 'really_cool' => [{:totally_cool => 'totally'}] }
# => {:this_is_cool=>"123", :so_is_this=>{:level_two=>2, :oh_yeah=>"oh yeah", :another_level=>{:level_three=>3, :okay_thats_enough=>"yeah, enough man"}}, "really_cool"=>[{:totally_cool=>"totally"}]}
# >> nested_hash.camelize_keys!
# => {:thisIsCool=>"123", :soIsThis=>{:levelTwo=>2, :ohYeah=>"oh yeah", :anotherLevel=>{:levelThree=>3, :okayThatsEnough=>"yeah, enough man"}}, :reallyCool=>[{:totally_cool=>"totally"}]}