Rails JSON serialization and deserialization

event.rb

class Event < ActiveRecord::Base
  include EventJSON

  attr_accessible *EventJSON.attributes

  validates :starts_at, presence: true
  validates :ends_at, presence: true
  validates :all_day, inclusion: { in: [true, false] }
end

event_json.rb

# JSON attributes for Event model.
# See How to override default deserialisation of params to model object? http://stackoverflow.com/questions/12750125/how-to-override-default-deserialisation-of-params-to-model-object
# See Various issues and questions when using inside a Rails engine https://github.com/josevalim/active_model_serializers/issues/135
module EventJSON

  # Attributes that are allowed in JSON
  def self.attributes
    [ :title, :start, :end, :allDay, :description, :location, :color ]
  end

  # JSON input allDay matches all_day
  alias_attribute :allDay, :all_day

  # JSON input start matches starts_at
  # +time+:: UNIX time
  def start=(time)
    self.starts_at = Time.at(time)
  end

  # JSON input end matches ends_at
  # +time+:: UNIX time
  def end=(time)
    self.ends_at = Time.at(time)
  end

  # Override the JSON output.
  def as_json(options = nil)
    {
      id: id,
      title: title,
      start: starts_at,
      end: ends_at,
      allDay: all_day,
      description: description,
      location: location,
      color: color
    }
  end
end

events_controller.rb

class EventsController < ApplicationController
  wrap_parameters Event, include: EventJSON.attributes

  respond_to :json

  # GET /events
  def index
    respond_with Event.all
  end

  # GET /events/1
  def show
    respond_with Event.find(params[:id])
  end

  # POST /events
  def create
    respond_with Event.create(params[:event])
  end

  # PUT /events/1
  def update
    respond_with Event.update(params[:id], params[:event])
  end

  # DELETE /events/1
  def destroy
    respond_with Event.destroy(params[:id])
  end
end