indy.rb Notes API in Sinatra

app.rb

require 'bundler/setup'
require 'sinatra'
require 'mongoid'
require 'json'

Mongoid.load!("./mongoid.yml")

before do
  content_type :json
end

get '/:version/notes' do
  Note.all.to_json
end

get '/:version/notes/:note_id' do
  @note = Note.find(params[:note_id])
  if @note.nil?
    status 404
    {error: "The requested note does not exist"}.to_json
  else
    @note.to_json
  end
end

post '/:version/notes' do
  note = Note.new(params[:note])
  if note.save
    note.to_json
  else
    status 400
    {:error => note.errors}.to_json
  end
end

post '/:version/notes/:note_id' do
  @note = Note.find(params[:note_id])
  if @note.nil?
    status 404
    {error: "The requested note does not exist"}.to_json
  else
    @note.update_attributes(params[:note])
    @note.to_json
  end
end

post '/:version/notes/:note_id/destroy' do
  @note = Note.find(params[:note_id])
  if @note.nil?
    status 409
    {error: "This note is already deceased. Please stop kicking it, fine sir."}.to_json
  else
    @note.destroy
    {:success => "Said note#{Note.destroyed_notes.sample}."}.to_json
  end
end


class Note
  include Mongoid::Document
  field :subject, type: String
  field :body, type: String

  validates_presence_of :subject, :body

  def self.destroyed_notes
    [
      " has shuffled off this mortal coil",
      " is pushing up daisies",
      " is pining for the fjords",
      " has ceased to be",
      " is no more",
      " is a stiff",
      " is bereft of life",
      " rests in piece",
      "'s metabolic processes are now history",
      " is off the twig",
      " has kicked the bucket",
      " has run down the curtain",
      " has joined the choir invisible",
      " is an ex-parrot"
    ]
  end
end