Dan Brown lordofthedanse

Install Homebrew and Jupyter Notebook

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Install jupyter: brew install jupyter
Open a new notebook to confirm: jupyter notebook
If you don't have the R kernel when you open a new notebook (and you probably shouldn't), then you'll need to install the IRkernel: from the terminal, open R: then install.packages("IRkernel")
Create a Jupyter notebook with the R kernel.

Here are a few gotchas:

If you were running spring and didn't stop it before you squashed migrations, spring might have it's database config change (it'll look for the squasher database that was created temporarily). If you want to go back to your development database, just spring stop and then setup your database (however you do that) again.
You can run into rake db:migrate problems because the new squashed migration version has not been added to the schema_migrations table that tells Rails what migrations have already been run. Thus, your rake db:migrate command will be trying to create tables (via the squasher XXXX_init_schema migration) that already exist. The solution to this is to manually insert the value of your XXXX_init_schema migration into the schema_migration table:

psql
insert into schema_migrations (version) values ('99999999999999');, where the 99999999999999 value is actually the timestamp that appears in the XXXX_init_schema migration.

First, check your current config (example output in homebrew.mxcl.postgresql.plist.xml lower down in this gist):

cat ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

Most importantly, note the -D /usr/local/var/postgres argument.

Second, shut down your current PostgreSQL.

launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

	# Cheers to https://railsdesigner.com/favicons-in-rails/

	```
	inkscape ./icon.svg --export-width=32 --export-filename="./tmp.png"
	magick ./tmp.png ./public/favicon.ico
	rm ./tmp.png

	inkscape ./icon.svg --export-width=512 --export-filename="./public/icon-512.png"
	inkscape ./icon.svg --export-width=192 --export-filename="./public/icon-192.png"
	inkscape ./icon.svg --export-width=180 --export-filename="./public/apple-touch-icon.png"

	if ENV['PROFILE']
	config.cache_classes = true
	config.eager_load = true

	config.logger = ActiveSupport::Logger.new(STDOUT)
	config.log_level = :info

	config.public_file_server.enabled = true
	config.public_file_server.headers = {
	'Cache-Control' => 'max-age=315360000, public',

	Manually:
	pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log restart

	With homebrew:
	brew services restart postgresql (if postgres version is pinned (postgresql@10), then sub postgresql@10 for postgresql)

	Can also
	brew services stop postgresql
	brew services start postgresql

	Install Homebrew
	1. xcode-select --install
	2. ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
	3. brew doctor

	Install Python3 using Homebrew
	1. brew install python3

	Install packages for Python3
	1. pip3 install [package name without brackets]

	From the command line:
	createuser postgres -s -d (s is for superuser privileges, d is for creating DBs; capital S/D are the negations)