added get absolute url function

widget_aguandhischipmunks/announcement_board/models.py

 from django.db import models
 from dashboard.models import WidgetUser
+from django.urls import reverse
 
 # Announcement
 # title; body; author; pub_datetime 
@@ -11,6 +12,9 @@ class Announcement(models.Model):
 
     def __str__(self):
         return self.title
+    
+    def get_absolute_url(self):
+        return (reverse('announcement_board:announcement_details', kwargs={'pk' : self.pk}))
 
 
 # Reaction
@@ -22,3 +26,4 @@ class Reaction(models.Model):
 
     def __str__(self):
         return self.name
+