Weird issues with Dataclass + Declarative + own generic class

Describe the bug

Yesterday I could run my program perfectly 😄

Today, I was trying to create a class that is generic on a parameter, and I started getting weird errors. Trying to figure out what I was doing wrong, I reduced this generic class piece by piece, until basically two columns are left, and I still get weird errors. I double checked and it had all the same members as my original Base Entity, so I don’t see what is wrong tbh

To Reproduce

from sqlalchemy import Integer, String
from sqlalchemy.orm import DeclarativeBase, Mapped, MappedAsDataclass, mapped_column


class SomeBaseClass(DeclarativeBase, MappedAsDataclass):
    pass


class GenericSetting(SomeBaseClass):
    """Represents key value pairs for settings or values"""

    __tablename__ = "x_table_x"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, init=False)

    key: Mapped[str] = mapped_column(String, init=True)


config = ""
new_instance: GenericSetting

Error

---------------------------------------------------------------------------
ArgumentError                             Traceback (most recent call last)
c:\DEV\liquidity\generic_test.py in line 12
      [8](file:///c%3A/DEV/liquidity/generic_test.py?line=7) class SomeBaseClass(DeclarativeBase, MappedAsDataclass):
      [9](file:///c%3A/DEV/liquidity/generic_test.py?line=8)     pass
---> [12](file:///c%3A/DEV/liquidity/generic_test.py?line=11) class GenericSetting(SomeBaseClass):
     [13](file:///c%3A/DEV/liquidity/generic_test.py?line=12)     """Represents key value pairs for settings or values"""
     [15](file:///c%3A/DEV/liquidity/generic_test.py?line=14)     __tablename__ = "x_table_x"

File c:\DEV\liquidity\.venv\lib\site-packages\sqlalchemy\orm\decl_api.py:698, in DeclarativeBase.__init_subclass__(cls)
    [696](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_api.py?line=695)     _setup_declarative_base(cls)
    [697](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_api.py?line=696) else:
--> [698](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_api.py?line=697)     _as_declarative(cls._sa_registry, cls, cls.__dict__)

File c:\DEV\liquidity\.venv\lib\site-packages\sqlalchemy\orm\decl_base.py:207, in _as_declarative(registry, cls, dict_)
    [201](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=200) def _as_declarative(
    [202](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=201)     registry: _RegistryType, cls: Type[Any], dict_: _ClassDict
    [203](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=202) ) -> Optional[_MapperConfig]:
    [204](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=203) 
    [205](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=204)     # declarative scans the class for attributes.  no table or mapper
    [206](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=205)     # args passed separately.
--> [207](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=206)     return _MapperConfig.setup_mapping(registry, cls, dict_, None, {})

File c:\DEV\liquidity\.venv\lib\site-packages\sqlalchemy\orm\decl_base.py:288, in _MapperConfig.setup_mapping(cls, registry, cls_, dict_, table, mapper_kw)
    [284](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=283)     return _DeferredMapperConfig(
    [285](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=284)         registry, cls_, dict_, table, mapper_kw
    [286](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=285)     )
    [287](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=286) else:
--> [288](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=287)     return _ClassScanMapperConfig(
    [289](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=288)         registry, cls_, dict_, table, mapper_kw
    [290](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=289)     )

File c:\DEV\liquidity\.venv\lib\site-packages\sqlalchemy\orm\decl_base.py:523, in _ClassScanMapperConfig.__init__(self, registry, cls_, dict_, table, mapper_kw)
    [518](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=517) with mapperlib._CONFIGURE_MUTEX:
    [519](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=518)     clsregistry.add_class(
    [520](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=519)         self.classname, self.cls, registry._class_registry
    [521](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=520)     )
--> [523](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=522)     self._extract_mappable_attributes()
    [525](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=524)     self._extract_declared_columns()
    [527](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=526)     self._setup_table(table)

File c:\DEV\liquidity\.venv\lib\site-packages\sqlalchemy\orm\decl_base.py:1299, in _ClassScanMapperConfig._extract_mappable_attributes(self)
   [1289](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1288)             argnames = ["init", "default_factory", "repr"]
   [1291](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1290)         args = {
   [1292](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1291)             a
   [1293](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1292)             for a in argnames
   (...)
   [1297](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1296)             is not _NoArg.NO_ARG
   [1298](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1297)         }
-> [1299](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1298)         raise exc.ArgumentError(
   [1300](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1299)             f"Attribute '{k}' on class {cls} includes dataclasses "
   [1301](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1300)             f"argument(s): "
   [1302](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1301)             f"{', '.join(sorted(repr(a) for a in args))} but "
   [1303](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1302)             f"class does not specify "
   [1304](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1303)             "SQLAlchemy native dataclass configuration."
   [1305](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1304)         )
   [1307](file:///c%3A/DEV/liquidity/.venv/lib/site-packages/sqlalchemy/orm/decl_base.py?line=1306) our_stuff[k] = value

ArgumentError: Attribute 'id' on class <class '__main__.GenericSetting'> includes dataclasses argument(s): 'init' but class does not specify SQLAlchemy native dataclass configuration.

Versions

• OS:
• Python: 3.10.8
• SQLAlchemy: latest beta
• Database:
• DBAPI (eg: psycopg, cx_oracle, mysqlclient):

Additional context

No response