[+] add get_or_create for sqlalchemy

deps/test-task-2025-06-30-v1/python/online/fxreader/pr34/test_task_2025_06_30_v1/tickers/logic.py

@@ -8,7 +8,7 @@ async def ticker_store_multiple(
 	tickers: list[Ticker],
 ) -> None:
 	async with session() as active_session:
-		async with active_session.begin():
+		async with active_session.begin() as transaction:
 			active_session.add_all(
 				tickers,
 			)

deps/test-task-2025-06-30-v1/python/online/fxreader/pr34/test_task_2025_06_30_v1/tickers/utils.py

@@ -0,0 +1,49 @@
+from typing import (TypeVar, Optional, Any, cast,)
+from sqlalchemy.ext.asyncio import AsyncSessionTransaction, AsyncSession
+from sqlalchemy.future import select
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.exc import NoResultFound, IntegrityError
+
+M = TypeVar('M', bound='DeclarativeBase')
+
+async def get_or_create(
+	session: AsyncSession,
+	model: type[M],
+	create_method: Optional[str] = None,
+	create_method_kwargs: Optional[dict[str, Any]] = None,
+	**kwargs: Any
+) -> tuple[M, bool]:
+	async def select_row() -> M:
+		res = await session.execute(
+			select(model).where(
+				*[
+					getattr(model, k) == v
+					for k, v in kwargs.items()
+				]
+			)
+		)
+
+		row = res.one()
+		assert isinstance(row, model)
+
+		return row
+
+	try:
+		res = await select_row()
+		return res, False
+	except NoResultFound:
+		if create_method_kwargs:
+			kwargs.update(create_method_kwargs)
+
+		if not create_method:
+			created = model(**kwargs)
+		else:
+			created = getattr(model, create_method)(**kwargs)
+
+		try:
+			session.add(created)
+			await session.flush()
+			return created, True
+		except IntegrityError:
+			await session.rollback()
+			return await select_row(), False