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hopsoft / prefetch.js
Last active Feb 21, 2020
Turbolinks Prefetching
View prefetch.js
const hoverTime = 400
const fetchers = {}
const doc = document.implementation.createHTMLDocument('prefetch')
function fetchPage (url, success) {
const xhr = new XMLHttpRequest()'GET', url)
xhr.setRequestHeader('VND.PREFETCH', 'true')
xhr.onreadystatechange = () => {
if (xhr.readyState !== XMLHttpRequest.DONE) return
hopsoft / db.rake
Last active Jan 6, 2020
Rails rake tasks for dump & restore of PostgreSQL databases
View db.rake
# lib/tasks/db.rake
namespace :db do
desc "Dumps the database to db/APP_NAME.dump"
task :dump => :environment do
cmd = nil
with_config do |app, host, db, user|
cmd = "pg_dump --host #{host} --username #{user} --verbose --clean --no-owner --no-acl --format=c #{db} > #{Rails.root}/db/#{app}.dump"
puts cmd
hopsoft / example_job.rb
Last active Oct 25, 2019
Render views outside of the standard request context (i.e. ActiveJob) with Devise/Warden
View example_job.rb
class ExampleJob < ApplicationJob
queue_as :default
def perform(user)
# do some work
# HACK: get around limitations in devise/warden when rendering
# views outside the context of a formal http request
renderer =
renderer_env = renderer.instance_eval { @env }
hopsoft /
Last active Aug 8, 2019
Create and publish an NPM package cheat sheet
  1. Create an account on NPM

  2. Init your project

    mkdir example
    cd example
    yarn init
  3. Create a JavaScript file

hopsoft / benchmarks.rb
Last active May 28, 2019
Ruby 2.3 safe navigation `&.` vs Active Support's try
View benchmarks.rb
require "benchmark"
require "active_support/all" do |x|
count = 1_000_000
label_size = 20 "check for nil:".rjust(label_size) do
count.times { nil && nil.length }
hopsoft /
Created May 21, 2019
Install ruby with rbenv and jemalloc on ubuntu
sudo apt-get update
sudo apt-get install libjemalloc-dev
RUBY_CONFIGURE_OPTS='--with-jemalloc' rbenv install 2.6.3
# test (look for jemalloc warnings)
MALLOC_CONF=invalid_flag:foo ruby -v
hopsoft / model_supports_bulk_updates.rb
Last active Apr 19, 2019
ActiveRecord Bulk / Batch Update
View model_supports_bulk_updates.rb
# frozen_string_literal: true
module ModelSupportsBulkUpdates
extend ActiveSupport::Concern
module ClassMethods
# Performs a bulk update with an efficient single query for all the records in the list.
# Note that the records are not reloaded form the database.
# This means that ActiveRecord will still see these records as dirty after the bulk_update.
def bulk_update(records)
hopsoft /
Last active Apr 19, 2019
Simple API security with Rails

Simple API security with Rails

API clients set an HTML header.

Authorization: Token token="SECRET_API_KEY"

Your ApplicationController can then restrict access based on the token.

hopsoft / gist:6519388
Last active Apr 19, 2019
Rails presenter base class.
View gist:6519388
# app/presenters/presenter.rb
require "delegate"
class Presenter < SimpleDelegator
attr_reader :model, :controller
def initialize(model, controller)
@controller = controller
super(@model = model)
hopsoft /
Last active Apr 19, 2019
Query the recommended column order for PostgreSQL tables
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