Ruby Datamapper + Sinatra PUT

Gemfile

source 'https://rubygems.org'

gem 'sinatra'
gem 'thin'
gem 'data_mapper'
gem 'dm-sqlite-adapter'

main.rb

require 'sinatra'
require 'json'
require 'pp'
require_relative './user'

get '/' do
  content_type 'text/html'
  [
    '<ul>',
      User.all.map { |x| "<li><strong>#{x.id}</strong> | #{x.name} | #{x.notes}</li>" },
    '</ul>'
  ].join()
end

put '/users/:id' do
  user = User.get(params[:id]) || halt(404, { error: "No such user id."}.to_json)
  body = JSON.parse request.body.read

  body.each do |key, value|
    user[key] = value

    if (user.save)
      # Read PUT ~> http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
      status 301
    end
  end
end

user.rb

require 'data_mapper'

DataMapper::Logger.new($stdout, :debug)

DataMapper.setup(:default, 'sqlite:///Users/Bargelli/Code/sinatra-users/project.db')

class User
  include DataMapper::Resource

  property :id,         Serial
  property :name,       String
  property :notes,      Text
  property :created_at, DateTime
end

DataMapper.finalize
# DataMapper.auto_migrate!