Is there a better way of doing this? Basically I have a function that takes
a connectable (engine or connection) and I want to start a transaction.
However I can't just call .begin() because it could return a Transaction or
a Connection depending on what was passed in and I need a connection.
@contextlib.contextmanager
def _transaction(connectable):
if hasattr(connectable, 'in_transaction') and
connectable.in_transaction():
yield connectable
else:
with connectable.begin() as conn:
yield conn
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