Hi,
I was trying to follow the example I saw in the documentation for
subclassing MappedCollection (http://docs.sqlalchemy.org/en/latest/orm/
collections.html#custom-dictionary-based-collections)
However, something is wrong, because I get this error:
super(TranslationCollection, self).__setitem__(key, value,
_sa_initiator)
TypeError: expected 2 arguments, got 3
I simplified to:
from sqlalchemy.orm.collections import MappedCollection, collection
class TranslationCollection(MappedCollection):
@collection.internally_instrumented
def __setitem__(self, key, value, _sa_initiator=None):
super(TranslationCollection, self).__setitem__(key, value,
_sa_initiator)
and still get the error.
Here's how the collection_class is configured on the relationship:
collection_class=lambda:
TranslationCollection(operator.attrgetter("language_id")
Thanks !
Béru
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