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Prelude

I. Preface and Motivation

This guide was written because I don't particularly enjoy deploying Phoenix (or Elixir for that matter) applications. It's not easy. Primarily, I don't have a lot of money to spend on a nice, fancy VPS so compiling my Phoenix apps on my VPS often isn't an option. For that, we have Distillery releases. However, that requires me to either have a separate server for staging to use as a build server, or to keep a particular version of Erlang installed on my VPS, neither of which sound like great options to me and they all have the possibilities of version mismatches with ERTS. In addition to all this, theres a whole lot of configuration which needs to be done to setup a Phoenix app for deployment, and it's hard to remember.

For that reason, I wanted to use Docker so that all of my deployments would be automated and reproducable. In addition, Docker would allow me to have reproducable builds for my releases. I could build my releases on any machine that I wanted in a contai

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Renaming table in Ecto migration

I recently wanted to rename a model and its postgres table in a Phoenix app. Renaming the table was simple and documented, but the table also had constraints, sequences, and indexes that needed to be updated in order for the Ecto model to be able to rely on default naming conventions. I couldn't find any examples of what this would look like but was eventually able to figure it out. For anyone else in the same situation, hopefully this example helps.

In the example below, I'm renaming the Permission model to Membership. This model belongs to a User and an Account, so it has foreign key constraints that need to be renamed.

defmodule MyApp.Repo.Migrations.RenamePermissionsToMemberships do
  use Ecto.Migration

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Setup iTerm2 and oh-my-zsh

Enjoy ! 😄

Install iTerm 2

Download iTerm2 here.

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//
//  Stepper.swift
//  Stepperindicator
//
//  Created by Damiaan on 13/01/2019.
//  Copyright © 2019 Devian. All rights reserved.
//

import UIKit

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Modify proguard rules in a managed expo project

If you ever need to modify the proguard rules for the Android-part of your Expo managed workflow, you can achieve this by using a config plugin.

1. Make a folder for config-plugins called ./plugins in the project root folder.
2. Place the withProguardRules.js and my-proguard-rules.pro in the folder
3. Add the config plugin to the plugins array of your app.config.js (or app.json if you're using that instead).

NOTE: if you rename your .pro file, don't forget to change the two occurrences of my-proguard-rules in withProguardRules.js as well.

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import React from "react";
import { Dimensions, StyleSheet, Text, View } from "react-native";
import { PanGestureHandler } from "react-native-gesture-handler";
import Animated, {
    Easing,
    Extrapolate,
    interpolate,
    useAnimatedGestureHandler,
    useAnimatedReaction,
    useAnimatedStyle,

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defmodule Snowflake do
  use Application

  def start(_type, _args) do
    import Supervisor.Spec

    children = [
      worker(:riak_core_vnode_master, [Snowflake.VNode]),
    ]

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import android.provider.Settings;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

import android.util.Log;
import android.net.Uri;

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  	@SuppressLint("WrongConstant")
    public static boolean canDrawOverlays(Context context) {
        if (Build.VERSION.SDK_INT >= 23) {
            return Settings.canDrawOverlays(context);
        } else {
            if (Build.MANUFACTURER.equalsIgnoreCase("xiaomi")) {
                return true;
            }
            AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService("appops");
            Method method = null;

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import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Build;