benchmark_compiled_method.rb

require 'benchmark/ips'

begin
  class CreateModels < ActiveRecord::Migration

    def change
      create_table :books do |t|
        t.string   :attribute1
        t.integer  :attribute2
        t.float    :attribute3
        t.boolean  :attribute4
        t.text     :attribute5
        t.datetime :attribute6
        t.integer  :attribute7, :limit => 8

        t.timestamps null: false
      end
    end
  end

  ActiveRecord::Migration.verbose = false
  CreateModels.new.change

rescue => e
  # Tables already exist
  # puts e.message
end

class Book < ActiveRecord::Base
  if Rails.version.split(".").first.to_i < 4
    attr_accessible :attribute1, :attribute2, :attribute3, :attribute4, :attribute5, :attribute6, :attribute7
  end
end


unless Book.count >= 1000
  # insert 1000 records via seeds
  1000.times do
    Book.create!(
      attribute1: 'foo',
      attribute2: 12345,
      attribute3: 987.65,
      attribute4: true,
      attribute5: "TEXTTEXTTEXTTEXT",
      attribute6: Time.now,
      attribute7: 999999999999,
    )
  end
end

books1 = Book.all.to_a
books2 = Book.all.to_a

puts "=" * 80
puts "Benchmark : ActiveRecord read by compiled attribute method"
puts "#{Rails.version} - #{ActiveRecord::Base.configurations[Rails.env]['adapter']}"
puts "=" * 80
puts ""

Benchmark.ips do |x|

  x.report('compiled method') do
    books1.each do |book|
      book.id
      book.attribute1
      book.attribute2
      book.attribute3
      book.attribute4
      book.attribute5
      book.attribute6
      book.attribute7
    end
  end
end