eugeneius’s gists

eugeneius / database_cleaner.rb

Created November 29, 2021 11:32

Intercom's database_cleaner setup (supports initial clean, secondary connections, non-transactional tests, and eliminates an unnecessary query)

	require "database_cleaner"
	require "database_cleaner/active_record/deletion"

	module DatabaseCleaner

	module ActiveRecord
	module SelectiveTruncation

	def information_schema_exists?(_connection)
	true

eugeneius / circle_scientist.rb

Last active March 22, 2017 11:30

Compare control and candidate build runtimes

	#!/usr/bin/env ruby

	require "thor"
	require "net/http"
	require "json"

	class CircleScientist < Thor
	option :circle_api_token, required: true
	option :control_branch, default: "master"
	option :candidate_branch, required: true

eugeneius / reaper

Last active February 21, 2017 14:06

Labels and closes stale issues, modelled on the process Rails uses.

	#!/usr/bin/env ruby

	require "octokit"
	require "netrc"

	# Pass the repo to reap:
	# bin/reaper username/repository
	repo = ARGV[0]

	# Set the FORCE environment variable to "true" to actually perform actions:

eugeneius / datadog_pry.rb

Last active February 18, 2017 02:01

Open a Pry session and examine Datadog dashboard and monitors.

	#!/usr/bin/env ruby

	require 'thor'
	require 'dogapi'
	require 'pry'

	class DatadogPry < Thor
	DatadogDashboard = Struct.new(:name, :queries)
	DatadogMonitor = Struct.new(:name, :queries)

eugeneius / each_char_matching_pattern.rb

Last active November 7, 2016 22:23

Demonstrating how Ruby's lazy enumerators and enum_for work.

	def each_char_matching_pattern(io, pattern)
	return enum_for(:each_char_matching_pattern, io, pattern) unless block_given?

	io.each_line.lazy.select do \|line\|
	line =~ pattern
	end.flat_map do \|line\|
	line.chars
	end.each do \|line\|
	yield line
	puts "\toffset: #{io.pos}"

eugeneius / memoized_attributes_test.rb

Last active November 14, 2015 02:56

Demonstrates a bug in the identity_cache gem: https://github.com/Shopify/identity_cache/issues/246

	require "test_helper"

	class MemoizedAttributesTest < IdentityCache::TestCase
	def test_memoization_should_not_break_dirty_tracking
	item = Item.create!

	IdentityCache.cache.with_memoization do
	Item.fetch(item.id)
	Item.fetch(item.id).title = "my title"
	Item.fetch(item.id).update(title: "my title")

eugeneius / delete_missing_instances_from_hosted_zone.sh

Created March 31, 2015 15:10

If you automatically create Route 53 DNS entries for EC2 instances on boot, and you had a bug that meant they were never removed, this gist is for you.

	#!/bin/bash
	hosted_zone_id=$1
	hostnames=`./get_hostnames_from_hosted_zone.sh "$hosted_zone_id"`

	while read hostname; do
	echo "$hostname"
	instance_id=`./hostname_to_instance_id.sh "$hostname"`
	if [[ -z $instance_id ]]; then
	echo " hostname doesn't contain instance id, skipping."
	else

eugeneius / Gemfile_master

Last active October 19, 2018 16:39

Benchmark for schema cache dump changes: https://github.com/rails/rails/pull/17632

	source 'https://rubygems.org'

	gem 'rails', github: 'rails/rails'
	gem 'mysql2'
	gem 'benchmark-ips'

eugeneius / post-commit

Created October 19, 2014 02:36

Git post-commit hook that sends an approximation of GitHub's 'push' webhook after every commit. Helpful for testing code that consumes those webhooks.

	#!/usr/bin/env ruby

	# Git post-commit hook that sends an approximation of GitHub's 'push' webhook
	# after every commit. Helpful for testing code that consumes those webhooks.
	#
	# To set this up:
	# 1. Create a local repo where you'll make test commits
	# 2. Copy this script to .git/hooks/post-commit
	# 3. Make it executable: `chmod +x .git/hooks/post-commit`
	# 4. Change the `uri` variable below to where webhooks should be sent

eugeneius / singleton_class_prepend.rb

Created September 1, 2014 05:32

Demonstrates how the behaviour of include and prepend on a singleton class differs between Ruby 2.0 and 2.1

	module TestModule
	end

	class Included
	class << self
	include TestModule
	end
	end

	class Prepended

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