Carlos Gonzalez catogonzalez

Homebrew Permissions Denied Issues Solution

`sudo chown -R $(whoami) $(brew --prefix)/*`

Django Migrations without Downtime

The following instructions describe a set of processes allowing you to run Django database migrations against a production database without having to bring the web service down.

Note that in the below instructions, migrations are all run manually at explicit points, and are not an automatic part of the deployment process.

Adding Fields or Tables

Adding a (nullable) field or a new table

Make the model or column addition in your code.

On undoing, fixing, or removing commits in git

A git choose-your-own-adventure!

This document is an attempt to be a fairly comprehensive guide to recovering from what you did not mean to do when using git. It isn't that git is so complicated that you need a large document to take care or your particular problem, it is more that the set of things that you might have done is so large that different techniques are needed depending on exactly what you have done and what you want to have happen.

Working with git remotes on Heroku

Generally, you will add a git remote for your Heroku app during the Heroku app creation process, i.e. heroku create. However, if you are working on an existing app and want to add git remotes to enable manual deploys, the following commands may be useful.

Adding a new remote

Add a remote for your Staging app and deploy

Note that on Heroku, you must always use master as the destination branch on the remote. If you want to deploy a different branch, you can use the syntax local_branch:destination_branch seen below (in this example, we push the local staging branch to the master branch on heroku.

$ git remote add staging https://git.heroku.com/staging-app.git

	import argparse
	import csv

	def split_csv(filename):
	"""
	Splits a CSV file into two files with approximately half the rows each.

	Args:
	filename: The path to the CSV file to split.
	"""

	import jwt

	from django.conf import settings
	from django.contrib.auth.models import User

	from rest_framework import exceptions
	from rest_framework.authentication import TokenAuthentication


	class JSONWebTokenAuthentication(TokenAuthentication):

	require 'active_support/testing/time_helpers'

	# the class below could have any name
	class Tempo
	include ActiveSupport::Testing::TimeHelpers
	end

	# any desidered date
	desired_date = Date.today - 2.days

	#!/bin/sh
	# This is to automate the process of db snapshots with
	# https://github.com/fastmonkeys/stellar

	# read current git branch name
	BRANCH=$(git rev-parse --abbrev-ref HEAD )

	if stellar list \| grep $BRANCH; then
	# checkout the existing db snapshot
	stellar restore $BRANCH