Using #increment!

using_increment.rb

class CalculateUserBalanceJob < ApplicationJob
  queue_as :default

  def perform(user_id)
    user = User.find(user_id)

    puts "#{Thread.current.object_id} -> Calculating balance for user: #{user.email}"

    user_balance = user.user_balance

    # Simulate a long-running calculation
    sleep rand(5..10)

    user_balance.increment!(:balance, 1)
  end
end