fast init

src/template_project/adapters/data_gateways/user.py

@@ -0,0 +1,27 @@
+from typing import override
+from sqlalchemy import exists, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from template_project.adapters.data_gateways.tables import user_table
+from template_project.application.user.data_gateway import UserDataGateway
+from template_project.application.user.entity import User, UserId
+
+
+class DefaultUserDataGateway(UserDataGateway):
+    def __init__(self, session: AsyncSession) -> None:
+        self._session = session
+
+    @override
+    async def load_with_id(self, id_: UserId) -> User | None:
+        statement = select(User).where(user_table.c.id==id_)
+        result = await self._session.execute(statement)
+        return result.scalar_one_or_none()
+
+    @override
+    async def exists_by_email(self, email: str) -> bool:
+        statement = select(exists(select(user_table).where(user_table.c.email == email)))
+        result = await self._session.execute(statement)
+        result_fetchone = result.fetchone()
+        if result_fetchone is None:
+            return False
+        return result_fetchone[0]