class BooksController < ApplicationController
  # GET /books.json
  def index
    books = Book.all
    render :json => books
  end

  # GET /books/7.json
  def show
    book = Book.find(params[:id])
    render :json => book
  end

  # POST /books
  def create
    book = Book.new(params[:book])
    if book.save
      render :status => 200
    else
      render what ever validation error or message you want
    end
  end

  # PUT /books/7
  def update
    book = Book.find(params[:id])
    book.update_attributes(params[:book])
    if book.save
    ....
  end
end