How to Fix Slow Code in Ruby - scir_full_example_benchmark.rb
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# frozen_string_literal: true | |
require "bundler/inline" | |
gemfile(true) do | |
source "https://rubygems.org" | |
gem "benchmark-ips" | |
gem "rails" | |
gem "sqlite3" | |
end | |
require "rails" | |
require "active_record" | |
require "benchmark/ips" | |
Rails.cache = ActiveSupport::Cache::MemoryStore.new | |
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:") | |
ActiveRecord::Schema.define do | |
create_table :line_items do |t| | |
t.string :name | |
t.decimal :price | |
t.references :order | |
end | |
create_table :orders do |t| | |
end | |
end | |
class LineItem < ActiveRecord::Base | |
belongs_to :order | |
end | |
class Order < ActiveRecord::Base | |
has_many :line_items | |
def price | |
line_items.pluck(:price).sum | |
end | |
end | |
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 |
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