Kannan S kannans

Heroku Release Phase + Review Apps + Rails

This is a simplified, but fairly thorough, set of scripts and configuration to enable Heroku Release Phase for Rails apps. Further, this particular set up plays nicely with Heroku Review Apps in that the release phase script will:

Fail, loudly, if the DB does not yet exist.
Load the DB schema if the current schema version (as determined by bin/rails db:version) is 0.
Run DB migrations otherwise.

For a "normal" app that usually means it will run the DB migrations.

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

Webpack in Rails

All code is available in example app - https://github.com/maxivak/webpacker-rails-example-app

	#!/bin/sh

	t_dir="$HOME/tmp"

	mkdir -p ${t_dir}
	pushd ${t_dir}

	for url in \
	ftp://ftp.ruby-lang.org/pub/ruby/ruby-1.9.3-p194.tar.bz2 \
	http://openssl.org/source/openssl-1.0.1c.tar.gz

	macOS 11.6
	rails 7.0.0

	brew install vips
	brew install redis
	redis-server /usr/local/etc/redis.conf

	00:00 Scaffolding
	rails new demo
	cd demo

	/*
	* This is a manifest file that'll be compiled into application.css, which will include all the files
	* listed below.
	*
	* Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
	* or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path.
	*
	* You're free to add application-wide styles to this file and they'll appear at the top of the
	* compiled file, but it's generally better to create a new file per style scope.
	*

	ruby '2.7.1'

	gem 'rails', github: 'rails/rails'
	gem 'tzinfo-data', '>= 1.2016.7' # Don't rely on OSX/Linux timezone data

	# Action Text
	gem 'actiontext', github: 'basecamp/actiontext', ref: 'okra'
	gem 'okra', github: 'basecamp/okra'

	# Drivers

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>Label</key>
	<string>homebrew.mxcl.nginx</string>
	<key>RunAtLoad</key>
	<true/>
	<key>KeepAlive</key>
	<true/>

	# Sample implementation of quicksort and mergesort in ruby
	# Both algorithm sort in O(n * lg(n)) time
	# Quicksort works inplace, where mergesort works in a new array

	def quicksort(array, from=0, to=nil)
	if to == nil
	# Sort the whole array, by default
	to = array.count - 1
	end

Kannan S kannans

Heroku Release Phase + Review Apps + Rails

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

Data Structure Basics

Webpack in Rails

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