How can I implement built in signals, for my app?

[Joel Mathew]

How to implement built in signals, for my app?

I have a project myappointments, with two apps appointments and clinic in it.

Objective:
When a user logins, details should be entered in the database.

appointments/models.py:

class Event(models.Model):
id=models.AutoField(primary_key=True, unique=True)
type=models.CharField(max_length=60)
description = models.CharField(max_length=150)
time = models.DateTimeField(default=timezone.now)

appointments/__init__.py:

default_app_config = 'appointments.apps.AppointmentsConfig'

appointments/apps.py:

from django.apps import AppConfig
class AppointmentsConfig(AppConfig):
name = 'appointments'
def ready(self):
import appointments.signals # noqa

appointments/signals.py:

from django.contrib.auth.signals import user_logged_in
from django.dispatch import receiver
def record_loggedin(sender, user, request, **kwargs):
ev = Event(type="Login", description = 'User logged in:
{}'.format(request.user.id))
ev.save()
print("User has logged in. Saved event to DB.")
user_logged_in.connect(record_loggedin)

What other modifications do I need to do this?

- Joel G Mathew

[Matthew Pava]

You may want to look at this middleware package that will automatically audit user logins.
https://github.com/muccg/django-useraudit

Also, in using AppConfigs, avoid using default_app_config as stated here:
https://docs.djangoproject.com/en/2.1/ref/applications/#configuring-applications
"New applications should avoid default_app_config. Instead they should require the dotted path to the appropriate AppConfig subclass to be configured explicitly in INSTALLED_APPS."

Your settings file should have something like this:
INSTALLED_APPS = [....,'appointments.apps.AppointmentsConfig', ...]

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