0_respond_to.rb

# frozen_string_literal: true

require "active_record"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.string :name, :email, :username, :password, :birthday, :foo, :bar, :baz, :dog_name
    t.timestamps null: false
  end

  create_table :topics, force: true do |t|
    t.string :title
    t.integer :user_id
    t.timestamps null: false
  end
end

class Topic < ActiveRecord::Base
  belongs_to :user
end

class User < ActiveRecord::Base
  has_many :topics
end

user = User.create!(name: "user name", dog_name: "cinco")
user.respond_to?(:name)
topic = user.topics.build(title: "topic title")

# Benchmark.ips do |x|
#   x.report("changed?") { topic.changed? }
#   x.report("changed") { topic.changed }
#   x.report("changes") { topic.changes }
#   x.report("changed_attributes") { topic.changed_attributes }
#   x.report("title_change") { topic.title_change }
#   x.report("title_was") { topic.title_was }
# end

Benchmark.bm { |x|
  x.report("respond_to") {
    1_000_000.times {
      user.respond_to?(:dog_name)
    }
  }
}

head.txt

respond_to  1.067132   0.000808   1.067940 (  1.068390)
respond_to  1.241908   0.016600   1.258508 (  1.285221)
respond_to  1.207405   0.005271   1.212676 (  1.217845)
respond_to  1.184683   0.003760   1.188443 (  1.191192)
respond_to  1.070051   0.002091   1.072142 (  1.073820)
respond_to  1.135280   0.005627   1.140907 (  1.149822)
respond_to  1.087188   0.004278   1.091466 (  1.095548)
respond_to  1.055867   0.001639   1.057506 (  1.058680)
respond_to  1.016671   0.001528   1.018199 (  1.019871)
respond_to  1.043922   0.001511   1.045433 (  1.046850)
respond_to  1.047997   0.001400   1.049397 (  1.050332)
respond_to  1.038043   0.000994   1.039037 (  1.039547)
respond_to  1.021775   0.001520   1.023295 (  1.024422)
respond_to  1.070376   0.002899   1.073275 (  1.075764)
respond_to  1.108423   0.002648   1.111071 (  1.115584)
respond_to  1.220066   0.003965   1.224031 (  1.226699)
respond_to  1.061367   0.002085   1.063452 (  1.065009)
respond_to  1.060796   0.002615   1.063411 (  1.065675)
respond_to  1.050530   0.001080   1.051610 (  1.052452)
respond_to  1.106280   0.003030   1.109310 (  1.112513)

this_patch.txt

respond_to  0.738569   0.000581   0.739150 (  0.739610)
respond_to  0.737943   0.000476   0.738419 (  0.738887)
respond_to  0.752631   0.003258   0.755889 (  0.758984)
respond_to  0.768799   0.001314   0.770113 (  0.773280)
respond_to  0.748439   0.001468   0.749907 (  0.750912)
respond_to  0.742347   0.000922   0.743269 (  0.743870)
respond_to  0.732145   0.001841   0.733986 (  0.735342)
respond_to  0.798340   0.001562   0.799902 (  0.801558)
respond_to  0.733198   0.000566   0.733764 (  0.734220)
respond_to  0.705524   0.000705   0.706229 (  0.706727)
respond_to  0.729143   0.000631   0.729774 (  0.730290)
respond_to  0.733833   0.000681   0.734514 (  0.734881)
respond_to  0.853904   0.001371   0.855275 (  0.856204)
respond_to  0.729841   0.001577   0.731418 (  0.732504)
respond_to  0.720388   0.000809   0.721197 (  0.721655)
respond_to  0.879052   0.001410   0.880462 (  0.881244)
respond_to  0.748783   0.000290   0.749073 (  0.749206)
respond_to  0.743012   0.001387   0.744399 (  0.745671)