Kimo kimobrian

Migrations & Seeding

What are migrations??

Migrations are a way to make database changes or updates, like creating or dropping tables, as well as updating a table with new columns with constraints via generated scripts. We can build these scripts via the command line using knex command line tool.

To learn more about migrations, check out this article on the different types of database migrations!

Creating/Dropping Tables

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Deploying from circleci2.0 to Heroku

Resources:

Steps:

Prerequisites:

Heroku CLI installed on your computer
A project deployed to Heroku

Client/Server POST request example in pure Node.js

File server.js:

var http = require('http');
var querystring = require('querystring');

var server = http.createServer().listen(3000);

server.on('request', function (req, res) {

A Beginner's Guide to Ngrx/store

As someone who is fairly new to the world of Redux and to a certain extent Angular (not AngularJS), the thought of having to implement Redux to our app was very daunting. Not because it wasn't the right thing to do, our initial app was built quite quickly without much knowledge of Angular and in doing so it wasn't very testable, so Redux would help with that situation, the main difficulty was the learning curve.

Reducers; actions, states, the store, this vernacular was familiar to someone who had experience with Redux but not me, and the whole process is quite verbose, I mean–why would you split your code which was originally in one file, the component into multiple, the reducer, action and state? There are however, a lot of companies who use and find a lot of benefits form it, so I decided to do a deep dive into how and why it works and documented my find

Requirements

Minikube requires that VT-x/AMD-v virtualization is enabled in BIOS. To check that this is enabled on OSX / macOS run:

sysctl -a | grep machdep.cpu.features | grep VMX

If there's output, you're good!

Prerequisites

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	var p1={
	x:0,
	y:0
	};

	var p2={
	x:0,
	y:1
	};

	# Generate a new pgp key: (better to use gpg2 instead of gpg in all below commands)
	gpg --gen-key
	# maybe you need some random work in your OS to generate a key. so run this command: `find ./* /home/username -type d \| xargs grep some_random_string > /dev/null`

	# check current keys:
	gpg --list-secret-keys --keyid-format LONG

	# See your gpg public key:
	gpg --armor --export YOUR_KEY_ID
	# YOUR_KEY_ID is the hash in front of `sec` in previous command. (for example sec 4096R/234FAA343232333 => key id is: 234FAA343232333)

	# post_loc.txt contains the json you want to post
	# -p means to POST it
	# -H adds an Auth header (could be Basic or Token)
	# -T sets the Content-Type
	# -c is concurrent clients
	# -n is the number of requests to run in the test

	ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 http://example.com/api/v1/locations/