nicholasjhenry

// Required Plugin: https://marketplace.visualstudio.com/items?itemName=drcika.apc-extension

// settings.json
{
  // Remove left-side icons
  "workbench.activityBar.location": "hidden",
  // Remove bottom status bar
  "workbench.statusBar.visible": false,
  // Remove position indicator in the editor's scrollbar
  "editor.hideCursorInOverviewRuler": true,

nicholasjhenry

defmodule Executable do
  @moduledoc """
  Executables are either commands or queries.

  They should declare a struct that dictates the shape and defaults of their
  parameters and a `handle_execute/1` function that takes that struct and does
  something in response.
  """

  use Behaviour

nicholasjhenry

defmodule MasterProxy.Application do

  alias MyApp.Endpoint,        as: MyAppEndpoint
  alias MyApp.UserSocket,      as: MyAppUserSocket
  alias MyOtherApp.Endpoint,   as: MyOtherAppEndpoint
  alias MyOtherApp.UserSocket, as: MyOtherAppUserSocket

  alias Phoenix.LiveReloader.Socket,  as: LiveReloadSocket
  alias Plug.Cowboy

nicholasjhenry

How to connect and debug Elixir or Phoenix App at Heroku?

Heroku has a great feature called heroku ps:exec which allows you to connect to running nodes. You can use this command to connect your elixir nodes easily. And debug your nodes like in your network.

Step 1

Let's start with Procfile To run a named app at heroku your procfile should specify the app name like:

web: MIX_ENV=prod elixir --sname coolelixirapp -S mix run --no-halt

nicholasjhenry

#!/usr/bin/env bash
set -x

term_handler() {
  echo "Stopping the server process with PID $PID"
  erl -noshell -name "term@127.0.0.1" -eval "rpc:call('app@127.0.0.1', init, stop, [])" -s init stop
  echo "Stopped"
}

trap 'term_handler' TERM INT

nicholasjhenry

defmodule Projections.Repo.Migrations.CreateProjectionVersions do
  use Ecto.Migration

  def change do
    create table(:projection_versions, primary_key: false) do
      add :projection_name, :text, primary_key: true
      add :last_seen_event_id, :bigint

      timestamps
    end

nicholasjhenry

defmodule Example.Server do
  use GenServer

  def start_link(opts \\ []) do
    GenServer.start_link(__MODULE__, :ok, opts)
  end

  def init(state) do
    Process.flag(:trap_exit, true) # must trap exit for terminate call back to work
    IO.inspect "Starting server..."

nicholasjhenry

Requirements

• Docker Machine + Docker
• curl
• A Virtualbox-driven Docker Machine called "default" docker-machine create --driver virtualbox default (this is the default with Docker toolkit).

Usage

The git.io URL (http://git.io/vsk46) is a shortened form of the raw url of the plist.

nicholasjhenry

YARD CHEATSHEET http://yardoc.org

cribbed from http://pastebin.com/xgzeAmBn

Templates to remind you of the options and formatting for the different types of objects you might want to document using YARD.

Modules

Namespace for classes and modules that handle serving documentation over HTTP

nicholasjhenry

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console