Updated models.py

Fixed the get_absolute_url function to work with the templates

agusyquia_reading/bookshelf/models.py

 from django.db import models
+from django.urls import reverse
 
 class Author(models.Model):
     first_name = models.CharField(max_length=60)
@@ -11,6 +12,9 @@ class Author(models.Model):
         name = str(self.first_name + " " + self.last_name)
         return name
     
+    def get_absolute_url(self):
+        return reverse('bookshelf:author-details', kwargs={'pk': self.pk})
+
 class Books(models.Model):
     title = models.CharField(max_length=100)
     author = models.ForeignKey(Author, on_delete=models.CASCADE)
@@ -21,3 +25,6 @@ class Books(models.Model):
 
     def __str__(self):
         return self.title
+    
+    def get_absolute_url(self):
+        return reverse('bookshelf:book-details', kwargs={'pk': self.pk})