Migrating from sqlite to Postgres in Django

I have decided to explain the instructions from scratch:

1. Install Postgres on your computer.
- First install `sudo apt-get install libpq-dev python-dev` which are Postgres dependencies to work with Django perfectly. 
- Then, enter `sudo apt-get install postgresql postgresql-contrib` command to install Postgres.


2. Access to Postgres using  `sudo su - postgres` command.

3. Create a new database. `createdb <dbname>`

4. Create a database user (with password). `createuser -P <username>`

5. Access the shell using `psql` command.

6. Grant this new user access to your new database with `GRANT ALL PRIVILEGES ON DATABASE <dbname> TO <username>;` command.
 
7. Dump existing data. `python3 manage.py dumpdata > datadump.json`

8. Install Postgres package. `pip install psycopg2-binary`

9. Change settings.py configuration to the following:

   ```python
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': '<dbname>',
        'USER': '<username>',
        'PASSWORD': '<password>',
        'HOST': 'localhost',
        'PORT': '',  
    }
}

```

10. Make sure you can connect to Postgres DB. `python3 manage.py migrate --run-syncdb`

11. Run this on Django shell to exclude contentype data.

```python
python3 manage.py shell

>>> from django.contrib.contenttypes.models import ContentType
>>> ContentType.objects.all().delete()
>>> quit()
```

12. Finally, load your data. `python3 manage.py loaddata datadump.json`