I am having a bit of trouble getting DeferredReflection working the way I
want; not sure if I am overlooking something obvious or if I just don't
really understand how it's supposed to work.
I'm trying to define my models before creating my engine (this does not
work):
Base = declarative_base(cls=*DeferredReflection*)
class CityStats(Base):
__tablename__ = 'city_stats'
__table_args__ = {'schema': 'prod', *'autoload': True*}
if __name__ == '__main__':
engine = create_engine('...')
Base.metadata.bind = engine
Base.prepare(engine)
When I run this I get an error creating the CityStats class:
"sqlalchemy.exc.UnboundExecutionError:
No engine is bound to this Table's MetaData. Pass an engine to the Table
via autoload_with=<someengine>, or associate the MetaData with an engine
via metadata.bind=<someengine>"
Of course it does work if I create my engine and set Base.metadata.bind
BEFORE I define the CityStats model (this works):
engine = create_engine('...')
Base.metadata.bind = engine
class CityStats(Base):
__tablename__ = 'city_stats'
__table_args__ = {'schema': 'prod', *'autoload': True*}
Base.prepare(engine)
I'm trying to avoid some kind of model_init() function that everyone who
imports my models.py file will have to remember to call before importing my
models. Is this possible?
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