Fix type hint

sqladmin/forms.py

@@ -1,6 +1,7 @@
 """
 The converters are from Flask-Admin project.
 """
+
 from __future__ import annotations
 
 import enum
@@ -16,7 +17,11 @@
 )
 
 import anyio
-from sqlalchemy import Boolean, select
+from sqlalchemy import (
+    Boolean,
+    Select,
+    select,
+)
 from sqlalchemy import inspect as sqlalchemy_inspect
 from sqlalchemy.orm import (
     ColumnProperty,
@@ -109,7 +114,7 @@ def _inner(func: T_CC) -> T_CC:
 
 
 class ModelConverterBase:
-    relationships_statements: dict[str, str] = {}
+    relationships_statements: dict[str, Select] = {}
     """
     Select statement for relationships.
     """