Draper: How to convert all allowed attributes and public methods of the decorated model into json

Question

I'm looking for an easy way to convert decorated model into json to use in my client-side templates. I'd like to find a solution where all allowed attributes and public methods of the decorated model will persist in json.

Currently I have backbone RIA with rails backend. I'm using haml_coffee_assets gem for client-side templating. Draper is there to provide decoration for my User model

class ContactDecorator < Draper::Base

  include Draper::LazyHelpers

  decorates :user

  allows :login, :id, :total_unread, :total_messages

  def for_json
    {
        :new_messages => new_messages,
        :avatar_link => avatar_link,
        :login_name_link => login_name_link,
        :id => model.id,
        :name => model.login,
        :avatar => model.avatar.url(:small),
        :humanized_messages_number =>
    }
  end

  def  humanized_messages_number
    pluralize(user['total_messages'], t("share_my_trip.messages.Message"), t("share_my_trip.messages.Messages")) + " #{new_messages}"
  end

  def new_messages
    model['total_unread'].to_i > 0 ? "(#{model['total_unread'].to_i} #{t("share_my_trip.messages.new")})" : ''
  end

  def avatar_link
    link_to(image_tag(model.avatar.url(:small), :size => "32x32", :onerror => "this.src='/avatars/original/missing.png'"), share_my_trip_user_path(:id => model.login), :id => "user-nick-#{model.id}", :class => "author")
  end

  def login_name_link
    link_to(model.login, share_my_trip_user_path(:id => model.login), :id => "user-nick-#{model.id}", :class => "author")
  end

end

my controller code looks like:

def index
  @dialogs = ContactDecorator.decorate(current_user.contacts).collect{|c| c.for_json}
end

and than in my view I'm just initializing backbone app:

:javascript
  App.init({dialogs: #{@dialogs.to_json}})

Is there a way to delete ugly #for_json decorator method?