Hi!
I have base class (Bas) and derived one (Der). First is mapped. I
wanted second to use the same mapping but got exception:
AttributeError: 'NoneType' object has no attribute 'set' . But if i
add Bas class init before Der class init no exception is raised!
Code
##################################
from sqlalchemy.orm import mapper
from sqlalchemy import Table, Column, Integer, MetaData
metadata = MetaData()
table = Table('tableee', metadata,
Column('id', Integer, primary_key=True),
Column('fff', Integer),
)
class Bas(object):
def __init__(self):
self.fff = 0
class Der(Bas):
def __init__(self):
super(Der, self).__init__()
mapper (Bas, table)
#hand = Bas() # if i uncomment this line everything works
hand = Der()
#####################################
Adding mapper (Der, table) works as well but i dont think it's good
solution
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