added get_absolute_url function

nishaespera_reading/bookshelf/models.py

@@ -3,6 +3,8 @@ from datetime import datetime
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.core.exceptions import ValidationError
 
+from django.urls import reverse
+
 class Author(models.Model):
     first_name = models.CharField(max_length = 50)
     last_name = models.CharField(max_length = 50)
@@ -38,6 +40,9 @@ class Books(models.Model):
     
     def __str__(self):
         return self.title
+    
+    def get_absolute_url(self):
+        return reverse('bookshelf:books-list', kwargs={'pk': self.pk})