diff options
Diffstat (limited to 'alembic/util/sqla_compat.py')
| -rw-r--r-- | alembic/util/sqla_compat.py | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/alembic/util/sqla_compat.py b/alembic/util/sqla_compat.py index e2725d6..0070337 100644 --- a/alembic/util/sqla_compat.py +++ b/alembic/util/sqla_compat.py @@ -71,18 +71,17 @@ except ImportError: from sqlalchemy.sql.elements import _NONE_NAME as _NONE_NAME # type: ignore # noqa: E501 -if sqla_14: - # when future engine merges, this can be again based on version string - from sqlalchemy.engine import Connection as legacy_connection +class _Unsupported: + "Placeholder for unsupported SQLAlchemy classes" - sqla_1x = not hasattr(legacy_connection, "commit") -else: - sqla_1x = True try: - from sqlalchemy import Computed # noqa + from sqlalchemy import Computed except ImportError: - Computed = type(None) # type: ignore + + class Computed(_Unsupported): # type: ignore + pass + has_computed = False has_computed_reflection = False else: @@ -90,12 +89,15 @@ else: has_computed_reflection = _vers >= (1, 3, 16) try: - from sqlalchemy import Identity # noqa + from sqlalchemy import Identity except ImportError: - Identity = type(None) # type: ignore + + class Identity(_Unsupported): # type: ignore + pass + has_identity = False else: - # attributes common to Indentity and Sequence + # attributes common to Identity and Sequence _identity_options_attrs = ( "start", "increment", @@ -107,7 +109,7 @@ else: "cache", "order", ) - # attributes of Indentity + # attributes of Identity _identity_attrs = _identity_options_attrs + ("on_null",) has_identity = True |