Hi,
I'm using the association_proxy example:
http://www.sqlalchemy.org/docs/05/reference/ext/associationproxy.html?highlight=associationproxy#building-complex-views
The example uses this mapper definition:
mapper(Broker, brokers_table, properties={
'by_stock': relation(Holding,
collection_class=attribute_mapped_collection('stock'))
})
Since I use the DeclarativeBase for my model I tried this:
class Broker(DeclarativeBase):
...
__mapper_args__ = {'by_stock': relation(Holding,
collection_class=attribute_mapped_collection('stock'))}
The __mapper_args__ is what what I found over here:
http://www.sqlalchemy.org/docs/05/reference/ext/declarative.html#mapper-configuration
But unfortunately, I got this error when creating the database.
return Mapper(class_, local_table, *args, **params)
TypeError: Error when calling the metaclass bases
__init__() got an unexpected keyword argument 'by_stock'
What is the right way to accomplish this?
I also hope that gets added to the documentation, or as an example in
the SA distribution.
Cheers,
Kees
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