Benchmark Active Record #find(id) vs. #where(id: id)

benchmark_find_vs_where.rb

require 'benchmark/ips'
require 'active_record'
require 'logger'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :projects
end

class Project < ActiveRecord::Base
end

id = Project.create.id

Benchmark.ips do |x|
  x.report('find') { Project.find(id) }
  x.report('where id') { Project.where(id: id) }

  x.compare!
end