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Diffstat (limited to 'lib/sqlalchemy/sql/schema.py')
| -rw-r--r-- | lib/sqlalchemy/sql/schema.py | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql/schema.py b/lib/sqlalchemy/sql/schema.py index eddd62d65..b7ac16b0a 100644 --- a/lib/sqlalchemy/sql/schema.py +++ b/lib/sqlalchemy/sql/schema.py @@ -2807,7 +2807,6 @@ class ColumnCollectionMixin(object): cols_w_table = [c for c in col_objs if isinstance(c.table, Table)] cols_wo_table = set(col_objs).difference(cols_w_table) - if cols_wo_table: # feature #3341 - place event listeners for Column objects # such that when all those cols are attached, we autoattach. @@ -2815,7 +2814,9 @@ class ColumnCollectionMixin(object): # issue #3411 - don't do the per-column auto-attach if some of the # columns are specified as strings. - has_string_cols = set(self._pending_colargs).difference(col_objs) + has_string_cols = set( + c for c in self._pending_colargs if c is not None + ).difference(col_objs) if not has_string_cols: def _col_attached(column, table): |