annotation.rb

class Annotation
  include MongoMapper::Document

  key :quote, String
  key :text, String
  key :ranges, Array
  timestamps!

end

annotations_controller.rb

class AnnotationsController < ApplicationController

  def index
    annotations = Annotation.all
    response.headers["Access-Control-Allow-Origin"]="*"
    render json: annotations
  end

  def show
    annotation = Annotation.find(params[:id])
    response.headers["Access-Control-Allow-Origin"]="*"
    render json: annotation
  end

  def new
    annotation = Annotation.new
    response.headers["Access-Control-Allow-Origin"]="*"
    render json: annotation
  end

  def edit
    annotation = Annotation.find(params[:id])
  end

  def create
    response.headers["Access-Control-Allow-Origin"]="*"
    render json: params
    #annotation = Annotation.new(params)
    #annotation = Annotation.create({quote: params[:quote], text: params[:text]})

    #if annotation.save
    #  render json: annotation, status: :created, location: annotation
    #else
    #  render json: annotation.errors, status: :unprocessable_entity
    #end
  end

  def update
    annotation = Annotation.find(params[:id])

    response.headers["Access-Control-Allow-Origin"]="*"
    if annotation.update_attributes(params)
      head :no_content
    else
      render json: annotation.errors, status: :unprocessable_entity
    end
  end

  def destroy
    annotation = Annotation.find(params[:id])
    annotation.destroy

    response.headers["Access-Control-Allow-Origin"]="*"
    head :no_content
  end

end

routes.rb

Registration::Application.routes.draw do
  devise_for :admin_users, ActiveAdmin::Devise.config
  ActiveAdmin.routes(self)

  resources :registrations, :annotations
  
end