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feat(orm): initialize ORM mappers during startup #391

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feat(orm): initialize ORM mappers during startup #391

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a1e1a12
update startup logic
alixlahuec Feb 18, 2026
ecee8dc
Merge branch 'master' into feat/configure-mappers-at-startup
alixlahuec Feb 23, 2026
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6 changes: 6 additions & 0 deletions fastapi_sqla/sqla.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
from sqlalchemy import engine_from_config, text
from sqlalchemy.engine import Connection, Engine
from sqlalchemy.ext.declarative import DeferredReflection
from sqlalchemy.orm import configure_mappers
from sqlalchemy.orm.session import Session as SqlaSession
from sqlalchemy.orm.session import sessionmaker
from starlette.types import ASGIApp, Message, Receive, Scope, Send
Expand Down Expand Up @@ -81,6 +82,11 @@ def startup(key: str = _DEFAULT_SESSION_KEY):

logger.info("engine startup", engine_key=key, engine=engine_or_connection)

# Initialize all mappers, so that any errors are raised here,
# rather than during the first ORM-enabled operation.
configure_mappers()
logger.info("ORM configured")


@contextmanager
def open_session(key: str = _DEFAULT_SESSION_KEY) -> Generator[SqlaSession, None, None]:
Expand Down