diff --git a/tutorial3/website/views.py b/tutorial3/website/views.py
index 7e5afc0..b0cc844 100644
--- a/tutorial3/website/views.py
+++ b/tutorial3/website/views.py
@@ -39,7 +39,7 @@ def delete_post(id):
 
     if not post:
         flash("Post does not exist.", category='error')
-    elif current_user.id != post.id:
+    elif current_user.id != post.author:
         flash('You do not have permission to delete this post.', category='error')
     else:
         db.session.delete(post)
diff --git a/tutorial4/website/views.py b/tutorial4/website/views.py
index ba8185b..6416a35 100644
--- a/tutorial4/website/views.py
+++ b/tutorial4/website/views.py
@@ -39,9 +39,11 @@ def delete_post(id):
 
     if not post:
         flash("Post does not exist.", category='error')
-    elif current_user.id != post.id:
+    elif current_user.id != post.author:
         flash('You do not have permission to delete this post.', category='error')
     else:
+        for comment in post.comments:
+            db.session.delete(comment)
         db.session.delete(post)
         db.session.commit()
         flash('Post deleted.', category='success')
diff --git a/tutorial5/website/views.py b/tutorial5/website/views.py
index 511f7cc..fc5bd18 100644
--- a/tutorial5/website/views.py
+++ b/tutorial5/website/views.py
@@ -39,9 +39,11 @@ def delete_post(id):
 
     if not post:
         flash("Post does not exist.", category='error')
-    elif current_user.id != post.id:
+    elif current_user.id != post.author:
         flash('You do not have permission to delete this post.', category='error')
     else:
+        for comment in post.comments:
+            db.session.delete(comment)
         db.session.delete(post)
         db.session.commit()
         flash('Post deleted.', category='success')