jasonkarns

module MailerPreviewHelper
  extend ActiveSupport::Concern

  included do
    # Allows a mailer preview to override `params` method (either class or instance level)
    # to define the hash that will be passed to the mailer by default by the `preview` helper.
    class_attribute :params, default: {}, instance_accessor: false

    mailer.instance_methods(false).each do |action|
      define_method(action) { mailer.with(**params).send action }

al2o3cr

Reducing STI memory usage

if there are many STI child classes, ActiveRecord generates methods for each one individually. This is wasteful in the typical case, since all the children share the same underlying columns.

The small patch included here causes those methods to instead be generated in the parent class, shared amongst all the subclasses.

DO NOT use this if you call methods like attribute :foo to adjust the typecasting of columns in individual models.

maxivak

Webpack in Rails

All code is available in example app - https://github.com/maxivak/webpacker-rails-example-app

Table of Contents

• NPM and Yarn
• Webpack and Webpacker

samjonester

Tmate + Tmux pairing

Tmate is used as the "free reverse ssh tunnel". It is not super secure because a key is not required to connect, but it sure is conventient. Tmux is used inside the Tmate session to share multiple terminal windows

---

Here's the situation.

You've createe a new tmux session where you will do your work named foo.

PurpleBooth

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

bridgetkromhout

0. What is the name of the ELB which needs to be pre-warmed?
a. e.g. yourwebapp-yourcompany-123456789.us-east-1.elb.amazonaws.com

1. What is the approximate increase percentage in traffic, or expected requests/sec that will go through the load balancer (whichever is easier to answer)?
a. e.g. 3,500 per second

2. Do you know the average amount of data passing through the ELB per request/response pair?
a. e.g. Roughly 250KB.

3. Expected percent of traffic going through the ELB that will be using SSL termination?

halcyonCorsair

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant::Config.run do |config|
  # All Vagrant configuration is done here. The most common configuration
  # options are documented and commented below. For a complete reference,
  # please see the online documentation at vagrantup.com.

  # Every Vagrant virtual environment requires a box to build off of.
  config.vm.box = "precise64"

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

vitobotta

#!/bin/bash

# Also see: http://vitobotta.com/resque-automatically-kill-stuck-workers-retry-failed-jobs/

[[ -f /tmp/retry-failed-resque-jobs ]] && rm /tmp/retry-failed-resque-jobs

ps -eo pid,command | 
grep [r]esque | 
grep "Processing" |
while read PID COMMAND; do  

theconektd

body {
  font-family: Helvetica, arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  padding-top: 10px;
  padding-bottom: 10px;
  background-color: white;
  padding: 30px; }

body > *:first-child {