kamipo/create_or_find_by.rb Secret

## create_or_find_by.rb
# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "activerecord", "6.1.0"
  gem "mysql2"
end

require "active_record"
require "logger"

ActiveRecord::Base.establish_connection(adapter: "mysql2", database: "test", username: "root")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.string :name, index: { unique: true }
  end
end

class User < ActiveRecord::Base
end

t = Thread.new do
  sleep 0.1
  User.create!(name: "foo")
end

User.transaction do
  User.find_by!(name: "foo")
rescue ActiveRecord::RecordNotFound
  puts 'User<name: "foo"> not found'

  sleep 0.2

  User.create_or_find_by!(name: "foo").tap do
    puts 'User<name: "foo"> has found or created'
  end
end

t.join
	# frozen_string_literal: true

	require "bundler/inline"

	gemfile(true) do
	source "https://rubygems.org"

	git_source(:github) { \|repo\| "https://github.com/#{repo}.git" }

	gem "activerecord", "6.1.0"
	gem "mysql2"
	end

	require "active_record"
	require "logger"

	ActiveRecord::Base.establish_connection(adapter: "mysql2", database: "test", username: "root")
	ActiveRecord::Base.logger = Logger.new(STDOUT)

	ActiveRecord::Schema.define do
	create_table :users, force: true do \|t\|
	t.string :name, index: { unique: true }
	end
	end

	class User < ActiveRecord::Base
	end

	t = Thread.new do
	sleep 0.1
	User.create!(name: "foo")
	end

	User.transaction do
	User.find_by!(name: "foo")
	rescue ActiveRecord::RecordNotFound
	puts 'User<name: "foo"> not found'

	sleep 0.2

	User.create_or_find_by!(name: "foo").tap do
	puts 'User<name: "foo"> has found or created'
	end
	end

	t.join