Camelize Hash keys to return in JSON request. In other words, idiomatic JSON for your Rubies. Consider this pseudo-code as it's about 40% untested.

idiomatic_mofo.rb

def HashExtensions(hash)
  hash.extend(HashExtensions)
end

module HashExtensions

    def camelize_keys
      dup.camelize_keys!
    end

    def camelize_keys!
      keys.each do |k|
        new_key = k.to_s.camelize(:lower)
        new_key = new_key.to_sym if k.is_a? Symbol
        self[new_key] = self.delete(k)
      end
      self
    end

end

your_model.rb

class YourModel < ActiveRecord::Base
  def as_json
    HashExtensions(attributes).camelize_keys.to_json
  end
end

If ActiveSupport is available you can use:

# with a single level hash
hash.transform_keys{ |key| key.to_s.camelize(:lower) }
# with nested hashes
hash.deep_transform_keys{ |key| key.to_s.camelize(:lower) }