Fix refs, use generator expr

sqlalchemy_utils/functions/__init__.py

@@ -18,7 +18,6 @@ from .orm import (
     identity,
     naturally_equivalent,
     primary_keys,
-    remove_property,
     table_name,
 )
 
@@ -40,7 +39,6 @@ __all__ = (
     non_indexed_foreign_keys,
     primary_keys,
     QuerySorterException,
-    remove_property,
     render_expression,
     render_statement,
     sort_query,

sqlalchemy_utils/functions/database.py

@@ -228,9 +228,9 @@ def is_indexed_foreign_key(constraint):
     :param constraint: ForeignKeyConstraint object to check the indexes
     """
     for index in constraint.table.indexes:
-        index_column_names = set([
+        index_column_names = set(
             column.name for column in index.columns
-        ])
+        )
         if index_column_names == set(constraint.columns):
             return True
     return False