snapshots_controller.rb

require 'base64'

class SnapshotsController < AuthenticatedController
  protect_from_forgery except: :create

  def create
    chart1 = snapshot.split(',')
    image = Base64.decode64(chart1[1])

    file = File.open("/tmp/test.png", 'wb') do|f|
        f.write(image)
    end

    current_user.snapshot = File.open('/tmp/test.png')
    current_user.save!
    current_user.notify_new_snapshot
    head :ok
  end

  private

  def snapshot
    params[:snapshot]
  end
end