require 'active_support'
require 'active_record'
require 'benchmark/ips'

ActiveRecord::Base.establish_connection(
  adapter: 'mysql2',
  encoding: 'utf8',
  reconnect: true,
  pool: 25,
  host: 'localhost',
  database: 'test_database',
  username: 'root',
  password: ''
)

class Customer < ActiveRecord::Base; end

name = 'Luciano Sousa'

Benchmark.ips do |x|
  x.report('where_first')  { Customer.where(name: name).first }
  x.report('find_by_name') { Customer.find_by_name(name)      }
  x.report('find_by')      { Customer.find_by(name: name)     }
  x.compare!
end