On 07/25/2016 12:23 AM, Ameretat Reith wrote:
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.
leave the table argument None on Father1980
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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