I was using "descriptor" as best I could to match its meaning as I understood
it in SQLAlchemy
(http://docs.sqlalchemy.org/ru/latest/glossary.html#term-descriptor), but it
may be wrong. Here's how I could somewhat reproduce the error using your code
(by the way, which is more appropriate for this mailing list, inline or
attached?):
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
t = Table('t', Base.metadata,
Column('user_id', Integer, primary_key=True),
Column('data', String)
)
class A(Base):
__table__ = t
user_id = t.c.user_id
user_id2 = t.c.user_id #should be another alias for user_id (right?)
a1 = A()
a1.user_id = 5
print a1.user_id
print a1.user_id2
# At this point, a1.user_id and a1.user_id2 do not evaluate to the same value.
# In my particular case, a1 was a query result/row, and I could refer to any
# of the mapped class attributes to get the value for that field, except the one
# named the same as the column name
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