wakproductions

class PdfMerger
  
  def merge(pdf_paths, destination)
    
    first_pdf_path = pdf_paths.delete_at(0)
    
    Prawn::Document.generate(destination, :template => first_pdf_path) do |pdf|
      
      pdf_paths.each do |pdf_path|
        pdf.go_to_page(pdf.page_count)

wakproductions

# Here's a contrived example of a LEFT JOIN using ARel. This is an example of
# the mechanics, not a real-world use case.

# NOTE: In the gist comments, @ozydingo linked their general-purpose ActiveRecord
# extension that works for any named association. That's what I really wanted!
# Go use that! Go: https://gist.github.com/ozydingo/70de96ad57ab69003446

# == DEFINITIONS
# - A Taxi is a car for hire. A taxi has_many :passengers.
# - A Passenger records one person riding in one taxi one time. It belongs_to :taxi.

wakproductions

After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
brew unlink postgresql
brew install postgresql@9.6
brew unlink postgresql@9.6
brew link postgresql

wakproductions

Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

1. brew doctor
2. brew update

wakproductions

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

wakproductions

#!/bin/bash

#
# copy this into /etc/profile.d/instance-name-tag.sh
#
# you will need: 
# - curl, jq, and aws cli installed
# - an IAM role that gives the EC2 instance access to describe tags
#

wakproductions

Base commands:

Creating a new container

docker run [-d (runs in background] [-p <host-system-port>:<container-port>] <image:tag>
* Creates a new container from an image
* If you run it 4 times, it will create 4 containers
Options:
 --name Give the container a name, otherwise it will pick a default name.

wakproductions

module WAKUtils
  def self.reload(require_regex)
    $".grep(/#{require_regex}/).each {|e| $".delete(e) && require(e) }
  end
end