Alexander Samchuk pandwoter

Installing NixOS on a Lenovo ThinkPad Carbon X1 Gen 9

Installation media

Downloaded nixos-21.11/latest-nixos-gnome-x86_64-linux.iso__ from channels.nixos.org__.
NixOS manual instructs to create the USB stick using dd

For MacOS Catalina, visit Install mysql2 on MacOS Catalina

Problem

Installing mysql2 gem errors on MacOS Mojave.

Solution

Make sure openssl is installed on Mac via Homebrew.

Upload images with React and the carrierwave Ruby gem for Rails 5

I recently attended a 4.5 month, intensive coding bootcamp in Boston, MA called Launch Academy. I spent a lot of time in academic science doing imaging research, so I naturally had an interest in learning how to manipulate images in this new web browser environment. For my capstone project, I created a very simple image editing Rails app where I realized I needed to be able to save/upload images to my database.

Since, through earnest effort, I wanted my app to use React for a single-page experience, and I quickly discovered that my desire to use a React/fetch/carrierwave/fog/Rails strategy was initially difficult to learn. I had to pull information from many sources (StackOverflow, Medium, official docs, other blog posts, course instructors, etc) to develop a method that uses this specific POSTing cycle.

This blog post represents my findings to integrate all these technologies in a modern, seamless

Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

brew doctor
brew update

How to update the Go version

System: Debian/Ubuntu/Fedora. Might work for others as well.

1. Uninstall the exisiting version

As mentioned here, to update a go version you will first need to uninstall the original version.

To uninstall, delete the /usr/local/go directory by:

Install `ctags`

http://ctags.sourceforge.net follow this url for installation and documentation.

Ctags with Ruby/Rails

We can ctags lots of programming languages. Here is how to do it for ruby/rails. I really like how RubyMine jumps to the source code (either withing project score or to the gem source). This is really useful for reading source code for those classes, methods, modules etc. But Now that I use vim as My IDE/Editor I really like that functionality to happen in my vim editor. And I found ctags as the solution.

How to write a simple `Nightwatch` test for a `React` app?

Nightwatch is a testing tool made in Node and Selenium to test browser apps. Long story short you can set it to navigate (really, truly, navigate) your site to test it as if it was a real person.

After you setup your environment, add your tests and run them Nightwatch will open a browser and start interacting with your site in realtime (you can see the whole thing). It will starting clicking around based on what you told it it should click and test if it encounters what you told it it should encounter.

Ok, so lets get to it!

I'm not gonna focus much in the setting up process (I'm much more interested in the API and the use cases) but this is a summary of what you should do in Mac: (full instructions in the Nightwatch website)

	# frozen_string_literal: true

	### Usage

	# Helps to understand how operation run affects the database state
	# DatabaseChangesLogger.call(filename: 'output') { Operation.perform }

	module DatabaseChangesLogger
	EVENTS_TYPE = 'sql.active_record'
	OPERATION_REGEX = /Update\|Create/.freeze

	require "capistrano/setup"
	require "capistrano/deploy"
	require "capistrano/scm/git"
	require 'capistrano/npm'
	install_plugin Capistrano::SCM::Git
	Dir.glob("lib/capistrano/tasks/*.rake").each { \|r\| import r }

	--- PSQL queries which also duplicated from https://github.com/anvk/AwesomePSQLList/blob/master/README.md
	--- some of them taken from https://www.slideshare.net/alexeylesovsky/deep-dive-into-postgresql-statistics-54594192

	-- I'm not an expert in PSQL. Just a developer who is trying to accumulate useful stat queries which could potentially explain problems in your Postgres DB.

	------------
	-- Basics --
	------------

	-- Get indexes of tables