> > mapper(Father1980,fathers,inherits=fathersMapper,
> > polymorphic_identity='young-father')
>
> you have the wrong table above ("fathers" and not "fathers80s").
> There's a bug here in how the ORM is corrupting the table in response
> to this which I'll fix separately.
I'm actually trying to map both `Father' and `Father1980' to the same
table, `fathers'. Like [1] but without declarative API. `fathers80s'
is here just to show separating tables solve the issue.
>
> >
> > File"/venv/lib/python2.7/site-packages/sqlalchemy/sql/expression.py",line
> > 2737,incorresponding_column ifself.c.contains_column(column):
>
>
> This is a very old version of SQLAlchemy, as starting with the 0.9
> series the expression.py module was refactored to not be 4000 lines
> long. If you're doing new ORM development and not just maintaining
> legacy code, I encourage you to upgrade to version 1.0.
>
>
It's traceback with 1.0.13:
```
Traceback (most recent call last):
File "a.py", line 43, in <module>
polymorphic_identity='young-father')
File "<string>", line 2, in mapper
File "/venv/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 627,
in __init__
self._configure_properties()
File "/venv/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 1292,
in _configure_properties
self._adapt_inherited_property(key, prop, False)
File "/venv/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 1514,
in _adapt_inherited_property
self._configure_property(key, prop, init=False, setparent=False)
File "/venv/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 1541,
in _configure_property
prop.columns[0])
File "/venv/lib/python2.7/site-packages/sqlalchemy/sql/selectable.py", line
476, in corresponding_column
if self.c.contains_column(column):
File "/venv/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line
754, in __get__
obj.__dict__[self.__name__] = result = self.fget(obj)
File "/venv/lib/python2.7/site-packages/sqlalchemy/sql/selectable.py", line
553, in columns
return self._columns.as_immutable()
AttributeError: 'Table' object has no attribute '_columns'
```
Thanks.
1:
http://docs.sqlalchemy.org/en/latest/orm/inheritance.html#single-table-inheritance
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