add absolute url (also for 'view on site' in admin app)

fet2020/blackboard/models.py

@@ -1,6 +1,7 @@
 from django.conf import settings
 from django.core.validators import ValidationError
 from django.db import models
+from django.urls import reverse
 from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
 
@@ -39,6 +40,9 @@ class JobPosting(models.Model):
     def __str__(self):
         return str(self.publishDate) + "_" + self.companyName + "_" + self.jobName
 
+    def get_absolute_url(self):
+        return reverse("blackboard")
+
     def pdf2jpeg(self, pdf_input_path, jpeg_output_path):
         args = [
             "pef2jpeg",  # actual value doesn't matter