Using RABL in Rails JSON Web API

gistfile1.rb

# tryrabl/app/views/users/base.rabl
attributes :id, :username, :email, :display_name

gistfile2.rb

# tryrabl/app/views/users/show.rabl
extends "users/base"
object @user

## JSON output:
# {
#     "user": {
#         "id": 8,
#         "username": "blaise",
#         "email": "[email protected]",
#         "display_name": "Ms. Noe Lowe"
#     }
# }

gistfile3.rb

# tryrabl/app/views/users/index.rabl
extends "users/base"
collection @users

## JSON output:
# [{
#     "user": {
#         "id": 1,
#         "username": "alanna",
#         "email": "[email protected]",
#         "display_name": "Mrs. Gaylord Hoeger"
#     }
# }, {
#     "user": {
#         "id": 2,
#         "username": "jarrell.robel",
#         "email": "[email protected]",
#         "display_name": "Oran Lebsack"
#     }
# }]

gistfile4.rb

attributes :id, :title, :description, :start, :end, :location
child :creator => :creator do
  extends 'users/base'
end

## JSON output:
# {
#     "event": {
#         "id": 7,
#         "title": "Et earum sed fuga.",
#         "description": "Quis sed ..e ad.",
#         "start": "2011-05-31T08:31:45Z",
#         "end": "2011-06-01T08:31:45Z",
#         "location": "Saul Tunnel",
#         "creator": {
#             "id": 1,
#             "username": "alanna",
#             "email": "[email protected]",
#             "display_name": "Mrs. Gaylord Hoeger"
#         }
#     }
# }

gistfile5.rb

class GuestsController < ApplicationController
  def index
    @guests = EventGuest.where(:event_id => params[:event_id])
  end
end

gistfile6.rb

# tryrabl/app/views/guests/index.rabl
collection @event_guests

# include the additional attribute
attributes :rsvp

# add child attributes to parent model
glue :user do
  extends "users/base"
end

## JSON output:
# [{
#     "event_guest": {
#         "rsvp": "PENDING",
#         "id": 3,
#         "username": "myrna_harvey",
#         "email": "[email protected]",
#         "display_name": "Savion Balistreri"
#     }
# }, {
#     "event_guest": {
#         "rsvp": "PENDING",
#         "id": 4,
#         "username": "adelle.nader",
#         "email": "[email protected]",
#         "display_name": "Edgardo Dickens"
#     }
# }]