Adding PostgreSQL to Django

Requirements

  1. VirtualEnv
  2. Django
  3. PostgreSQL

Add on to post from Painless PostgreSQL + Django

The recommendation is to follow the steps from the original well-written post and refers to the following to fill in some of the possible gaps .

  1. Activate a virtualenv
  2. Git clone the project (in the post) to local directory
  3. Run pip install -r requirements.txt
  4. Upgrade Django version (will encounter error if this step is not performed). pip install django==1.11.17.  This only applies if you following the post and cloning the project used in the post.
  5. Create new user in Postgres, create new database & grant assess (Step 1 & 2 of post)
  6. Update settings.py on the database portion.
  7. Create environment variables in the virtualenv.  See link for more information.
    1. Note: Secret Key needs to be included as one of the environment variable.
    2. Update the postactivate file of the virtualenv so the environment variables are present when virtualenv is activated.
    3. To get path of the virtualenv: echo $VIRTUAL_ENV

Create new user in Postgres

# Psql codes for Step 1 and 2 of original post.
# ensure Postgres server is running
psql
# create user with password
CREATE USER sample_user WITH PASSWORD 'sample_password';
# create database
CREATE DATABASE sample_database WITH OWNER sample_user;

Update database information in Setting.py

# Changes in the settings.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': os.environ.get('DB_NAME', ''),
        'USER': os.environ.get('DB_USER', ''),
        'PASSWORD': os.environ.get('DB_PASS', ''),
        'HOST': 'localhost',
        'PORT': '5432',
    }
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = os.environ.get('DJANGO_SECRET_KEY', '')

Update environment variables in VirtualEnv

# postactivate script in the project virtual env bin path.
# E.g. ~/.virtualenv/[projectname]/bin/postactivate

#!/bin/bash
# This hook is sourced after this virtualenv is activated.
export DB_NAME='sample_database'
export DB_USER='sample_user'
export DB_PASS='sample_password'
export DJANGO_SECRET_KEY='thisissecretkey'

Running migrations (Ensure PostgreSQL server is running)

python manage.py makemigrations
python manage.py migrate
python manage.py createsuperuser
python manage.py runserver

Additional notes:

  1. When running python manage.py runserver on local host and error occurs, check domain is included in the ALLOWED_HOSTS of setting.py. Alternatively, you can use below:
    • ALLOWED_HOSTS = [‘*’] # for local host only
  2. No database created when running psql command: CREATE DATABASE …, check if  semi-colon add to end of the statement. In the event, the ‘;’ is missing, type ‘;’ and try inputting the commands again. See link for more details.

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