How to Fix Slow Code in Ruby - scir_example_benchmark.rb

scir_example_benchmark.rb

# frozen_string_literal: true

require_relative "../../config/environment"

class OrderWithCachedPrice < Order
  def price
    Rails.cache.fetch("order_#{id}_total") { super }
  end
end

order = Order.first_or_create!
order.line_items.create!(name: "Rocket Shoes", price: 97.98)
order.line_items.create!(name: "Invisible Ink", price: 5.67)
order.line_items.create!(name: "Ray Gun", price: 1_235.97)
order.line_items.create!(name: "Chunky Bacon", price: 8.99)
order_with_cache = OrderWithCachedPrice.first

Benchmark.ips do |x|
  x.report("before") { order.price }
  x.report("after") { order_with_cache.price }

  x.compare!
end