Django Alert by jiaaro

Installation

1. Install lib with pip:

   pip install django-alert

   - OR -

   Put the "alert" directory somewhere in your python path

2. Add "alert" to your installed apps (in the settings.py file)

Making Alerts

Create an "alerts.py" file and import it at the bottom of your models.py file. This is where you will define your alert class. Every alert is subclassed from "alert.utils.BaseAlert"

Here is an example alert that is sent to users when they first sign up:

from alert.utils import BaseAlert
from django.contrib.auth.models import User

class WelcomeAlert(BaseAlert):
        title = 'Welcome new users'
        description = 'When a new user signs up, send them a welcome email'

        signal = post_save
        sender = User

        default = False

        def before(self, created, **kwargs):
            return created

        def get_applicable_users(self, instance, **kwargs):
            return [instance]

Writing Alert Backends

Alert includes an Email Backend by default. But you can write a backend for any messaging medium!

Alert Backends just need to subclass BaseAlertBackend and implement a send() method that accepts an alert instance

You can copy and paste the following code to get started:

from alert.utils import BaseAlertBackend

class MyAlertBackend(BaseAlertBackend):
    
    def send(self, alert):
        # send the alert here

Signals

When an alert is sent, a signal is fired (found in alert.signals). The "sender" keyword argument is the Alert you defined (WelcomeAlert in this case).

example:

from alert.signals import alert_sent

def do_something_after_welcome_alert_is_sent(sender, alert, **kwargs):
    pass

alert_sent.connect(do_something_after_welcome_alert_is_sent, 
                      sender=WelcomeAlert)