added get_books and get_absolute_url methods in Author class

bellapanghulan_reading/bookshelf/models.py

@@ -13,6 +13,12 @@ class Author(models.Model):
 
     def __str__(self):
         return self.first_name + " " + self.last_name
+    
+    def get_absolute_url(self):
+        return reverse('author-details', kwargs={'pk': self.pk})
+    
+    def books(self):
+        return Books.objects.filter(author=self)
 
 class Books(models.Model):
     title = models.CharField(max_length = 100)