feat: add hash to config classes (#358)

Implement `__hash__` methods for configuration classes

advanced_alchemy/config/asyncio.py

@@ -71,6 +71,12 @@ class SQLAlchemyAsyncConfig(GenericSQLAlchemyConfig[AsyncEngine, AsyncSession, a
     The configuration options are documented in the Alembic documentation.
     """
 
+    def __hash__(self) -> int:
+        return super().__hash__()
+
+    def __eq__(self, other: object) -> bool:
+        return super().__eq__(other)
+
     @asynccontextmanager
     async def get_session(
         self,

advanced_alchemy/config/common.py

@@ -3,6 +3,7 @@
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import TYPE_CHECKING, Callable, ClassVar, Generic, Union, cast
+from uuid import NAMESPACE_DNS, uuid3
 
 from typing_extensions import TypeVar
 
@@ -202,6 +203,14 @@ def __post_init__(self) -> None:
 
             event.listen(Session, "before_flush", touch_updated_timestamp)
 
+    def __hash__(self) -> int:
+        return hash((uuid3(NAMESPACE_DNS, str(self)), self.__class__.__name__, self.metadata, self.bind_key))
+
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, type(self)):
+            return False
+        return self.__hash__() == other.__hash__()
+
     @property
     def engine_config_dict(self) -> dict[str, Any]:
         """Return the engine configuration as a dict.

advanced_alchemy/config/sync.py

@@ -55,6 +55,12 @@ class SQLAlchemySyncConfig(GenericSQLAlchemyConfig[Engine, Session, sessionmaker
     The configuration options are documented in the Alembic documentation.
     """
 
+    def __hash__(self) -> int:
+        return super().__hash__()
+
+    def __eq__(self, other: object) -> bool:
+        return super().__eq__(other)
+
     @contextmanager
     def get_session(self) -> Generator[Session, None, None]:
         """Get a session context manager.