add NotifyMixin

notification/__init__.py

@@ -0,0 +1,26 @@
+class NotifyMixin:
+    def get_notification_recipients(self):
+        """
+        Should Query the users based on their notification settings 
+        and the entity.
+
+        Raises:
+            NotImplementedError: It should be implemented by the subclass
+        """
+        raise NotImplementedError(f"Subclasses of {NotifyMixin.__name__} must implement {self.get_notification_recipients.__name__}")
+
+    def make_notification(self):
+        """
+        Creates a notifications for the reciepients based on 
+        the business logic of the entity.
+
+        Raises:
+            NotImplementedError: It should be implemented by the subclass
+        """
+        raise NotImplementedError(f"Subclasses of {NotifyMixin.__name__} must implement {self.make_notification.__name__}")
+
+    def get_absolute_url(self):
+        """
+        Returns the absolute url of the entity.
+        """
+        return None