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

app.py

@@ -109,11 +109,14 @@ def create():
                          (new_topic,))
             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']
+                                    (topic_tag,)).fetchone()['id']
             conn.execute('INSERT INTO topic_cards (topic_id, card_id) VALUES (?,?)',
-                     (topic_id, cat_id))
+                         (topic_id, cat_id))
 
         if not content:
             flash('plz write a content!')
@@ -121,10 +124,15 @@ def create():
 
         cat_id = conn.execute('SELECT id FROM categories WHERE category_name = (?);',
                               (category_name,)).fetchone()['id']
-        
+
         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']