it doesn't show the new topic after submit, not fixed

app.py

@@ -110,6 +110,9 @@ def create():
             conn.commit()
             topic_tag = new_topic
 
+            cat_id = conn.execute('SELECT id FROM categories WHERE category_name = (?);',
+                                  (category_name,)).fetchone()['id']
+
             topic_id = conn.execute('SELECT id FROM topics WHERE content = (?);',
                                     (topic_tag,)).fetchone()['id']
             conn.execute('INSERT INTO topic_cards (topic_id, card_id) VALUES (?,?)',
@@ -125,6 +128,11 @@ def create():
         conn.execute('INSERT INTO cards (content, category_id) VALUES (?,?)',
                      (content, cat_id))
 
+        topic_id = conn.execute('SELECT id FROM topics WHERE content = (?);',
+                                (topic_tag,)).fetchone()['id']
+        conn.execute('INSERT INTO topic_cards (topic_id, card_id) VALUES (?,?)',
+                     (topic_id, cat_id))
+
         conn.commit()
         conn.close()
         return redirect(url_for('home'))
@@ -147,6 +155,7 @@ def edit(id):
 
     categories = conn.execute(
         'SELECT category_name FROM categories;').fetchall()
+    topics = conn.execute('SELECT content FROM topics;').fetchall()
 
     if request.method == 'POST':
         content = request.form['content']