Mike England mikeengland

pyProjectManage

Goal

Swapping the django user model during the lifecycle of a project (django 1.8 guide)

I've come to a point where I had to swap django's user model with a custom one, at a point when I already had users, and already had apps depending on the model. Therefore this guide is trying to provide the support that is not found in the django docs.

Django warns that this should only be done basically at the start of a project, so that the initial migration of an app includes the creation of the custom user model. It took a while to do, and I ran into problems created by the already existing relations between other models and auth.User.

There were good and not so good things regarding my project state, that influenced the difficulty of the job.

Things that made the swap simpler

My custom user also had an id field, that's just a usual default django id

###Let's install Vagrant###

Install VirtualBox: https://www.virtualbox.org/
Install Vagrant: http://vagrantup.com/

###Select a Vagrant Box from https://vagrantcloud.com###

#add it to your list of boxes
vagrant box add hashicorp/precise32
#create a new folder for your project &amp; init vagrant

	/* parser generated by jison 0.4.13 */
	/*
	Returns a Parser object of the following structure:

	Parser: {
	yy: {}
	}

	Parser.prototype: {
	yy: {},

	var Col = require('react-bootstrap/lib/Col')
	var PageHeader = require('react-bootstrap/lib/PageHeader')
	var React = require('react')
	var Row = require('react-bootstrap/lib/Row')
	var {connect} = require('react-redux')
	var {reduxForm} = require('redux-form')

	var DateInput = require('./DateInput')
	var FormField = require('./FormField')
	var LoadingButton = require('./LoadingButton')

	var axios = require("axios");
	var axiosDefaults = require("axios/lib/defaults");

	axiosDefaults.xsrfCookieName = "csrftoken"
	axiosDefaults.xsrfHeaderName = "X-CSRFToken"

	import { Component } from "React";

	export var Enhance = ComposedComponent => class extends Component {
	constructor() {
	this.state = { data: null };
	}
	componentDidMount() {
	this.setState({ data: 'Hello' });
	}
	render() {

	# -- coding: utf-8 --
	from django import forms
	from myapp.models import DataGroup # Overwrite this to your model
	from django.utils.encoding import force_text
	from django.utils.safestring import mark_safe
	from django.utils.html import format_html

	class DataGroupSelect(forms.widgets.Select):

	def render_option(self, selected_choices, option_value, option_label):

	from celery import Task
	from celery.task import task
	from my_app.models import FailedTask
	from django.db import models

	@task(base=LogErrorsTask)
	def some task():
	return result

	class LogErrorsTask(Task):

	/* Useful celery config.

	app = Celery('tasks',
	broker='redis://localhost:6379',
	backend='redis://localhost:6379')

	app.conf.update(
	CELERY_TASK_RESULT_EXPIRES=3600,
	CELERY_QUEUES=(
	Queue('default', routing_key='tasks.#'),