I've encounter an error today when I've try to inherit from a mixin who
implements the __declare_last__ method on a mapper that defines also the
__declare_last__ method.
Here's what my code looks like:
class Mixin(object):
@classmethod
def __declare_last__(cls):
cls.do_something()
class TableA(DeclarativeBase, Mixin):
@classmethod
def __declare_last__(cls):
cls.relationB = sqlalchemy.orm.relation(TableB)
When the code is executed I've the error : AttributeError:
'RelationshipProperty' object has no attribute 'my_column_name' that is
raised when I try to execute a query using the relationB
Even if I do nothing in the __declare_last__ from the mixin I've the same
error, when I've removed the __declare_last__ the code works perfectly.
I want to be able to have a default behavior on the __declare_last__ that
can be overridded on my mappers, but actually both methods triggers the
after_configured event.
Did you have any clue to avoid that error ?
Thanks
Martin
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