Hi!
Sorry for the late answer.
I got it now: There was a relation called 'status' in the parent class
and a function called status() in the derived class. After renaming
the function everything seems to work correct.
So the error does not belong to sqlalchemy, but concerns some bad
coding by myself.
A short description is below the message.
Thank you very much for your help!
Uwe Seher
What i have done:
changes in mapper.py:
def _is_userland_descriptor(self, obj):
try:
return not isinstance(obj,
(MapperProperty, attributes.QueryableAttribute))
and \
hasattr(obj, '__get__') and not \
isinstance(obj.__get__(None, obj),
attributes.QueryableAttribute)
except:
import pdb, sys
e,m,tb = sys.exc_info()
pdb.post_mortem(tb)
What happens:
uwe@pallas:~/dev/python/endb> ./test_api.py
/usr/local/lib64/python2.6/site-packages/endblib/model/endbauth.py:42:
SADeprecationWarning: useexisting is deprecated. Use extend_existing.
schema=schemata['pub'], useexisting=True)
/usr/local/lib64/python2.6/site-packages/endblib/model/endbauth.py:51:
SADeprecationWarning: useexisting is deprecated. Use extend_existing.
schema=schemata['pub'], useexisting=True)
/usr/local/lib/python2.6/site-packages/SQLAlchemy-0.7.4-py2.6-linux-
x86_64.egg/sqlalchemy/ext/declarative.py:1172: SADeprecationWarning:
useexisting is deprecated. Use extend_existing.
**table_kw)
> /usr/local/lib/python2.6/site-packages/SQLAlchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/orm/mapper.py(1459)_is_userland_descriptor()
-> isinstance(obj.__get__(None, obj),
(Pdb) args
self = Mapper|Facility|facilities
obj = <unbound method Facility.status>
(Pdb)
The error does not happen anymore when importing the lib in idle, but
when running my testscript and using it.
The method in obj looks like this and is not finished at the moment.
If i comment it out, everything works.
On 15 Dez., 16:48, Michael Bayer <mike...@zzzcomputing.com> wrote:
> On Dec 15, 2011, at 2:38 AM, useher wrote:
>
> > I write a library with some classes that has to bundle function for
> > different applications accessing data on a PostgreSQL-9.x Server.
> > sqlalchemy is installed and maintained by easy_install not by
> > packetmanagement. After upgrading to 0.7.4 the following error occurs:
>
> > File "build/bdist.linux-x86_64/egg/sqlalchemy/orm/mapper.py", line
> > 1481, in _should_exclude
> > File "build/bdist.linux-x86_64/egg/sqlalchemy/orm/mapper.py", line
> > 1458, in _is_userland_descriptor
> > TypeError: Error when calling the metaclass bases
> > issubclass() arg 1 must be a class
>
> I need to see what "arg" actually is here - you'll note the SQLAlchemy code
> in question isn't calling issubclass(), it's calling isinstance(). It
> suggests that SQLA's invocation of the descriptor itself is resulting in an
> issubclass() call, though when I try to simulate this error the stack trace
> is explicit:
>
> File "/Users/classic/dev/sqlalchemy/lib/sqlalchemy/orm/mapper.py", line
> 1458, in _is_userland_descriptor
> isinstance(obj.__get__(None, obj),
> File "test.py", line 9, in __get__
> if issubclass(owner, object):
> TypeError: Error when calling the metaclass bases
> issubclass() arg 1 must be a class
>
> so not sure why the actual source of issubclass() is not present in your
> stack trace.
>
> Can you just pdb into that section using pdb.post_mortem() and figure out
> what the descriptor in question is actually doing ? I'd like to understand
> what's going on before just putting in a blunt "except:".
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