Handle logging queries encoded as bytes under PostgreSQL

debug_toolbar/panels/sql/tracking.py

@@ -180,7 +180,10 @@ def _record(self, method, sql, params):
             # Sql might be an object (such as psycopg Composed).
             # For logging purposes, make sure it's str.
             if vendor == "postgresql" and not isinstance(sql, str):
-                sql = sql.as_string(conn)
+                if isinstance(sql, bytes):
+                    sql = sql.decode("utf-8")
+                else:
+                    sql = sql.as_string(conn)
             else:
                 sql = str(sql)
 

docs/changes.rst

@@ -13,6 +13,8 @@ Pending
   it collects the used static files in a ``ContextVar``.
 * Added check ``debug_toolbar.W007`` to warn when JavaScript files are
   resolving to the wrong content type.
+* Fixed SQL statement recording under PostgreSQL for queries encoded as byte
+  strings.
 
 4.1.0 (2023-05-15)
 ------------------

tests/panels/test_sql.py

@@ -158,6 +158,17 @@ def test_non_ascii_query(self):
         # ensure the panel renders correctly
         self.assertIn("café", self.panel.content)
 
+    @unittest.skipUnless(
+        connection.vendor == "postgresql", "Test valid only on PostgreSQL"
+    )
+    def test_bytes_query(self):
+        self.assertEqual(len(self.panel._queries), 0)
+
+        with connection.cursor() as cursor:
+            cursor.execute(b"SELECT 1")
+
+        self.assertEqual(len(self.panel._queries), 1)
+
     def test_param_conversion(self):
         self.assertEqual(len(self.panel._queries), 0)