So I guess that symbols starting with underscore ('_') are treated differently in Python when it comes to be exporting/importing? Sorry to be such a newb but this is the only conclusion I can (rationally!) come to.
Traceback (most recent call last): File "chimera_driver.py", line 42, in <module> q = s.query(_PrimaryKey).filter(_PrimaryKey.TABLE_NAME == 'banana') NameError: name '_PrimaryKey' is not defined pjjH On Apr 3, 11:34 am, "phrrn...@googlemail.com" <phrrn...@googlemail.com> wrote: > I copied the list of import statements from the module file > (deshaw.dbo.chimera) to the driver file. The driver file also has a > line: > from deshaw.dbo.chimera import * > > Note that this is happening with a particular class, DatabaseTable, > *not* with other classes I have declared and mapped such as > Dataserver. Interestingly, the DatabaseClass works when I comment out > a bunch of relations: > > mapper(DatabaseTable, tables, properties = { > # 'attributes' : relation(Attribute, lazy=False, > order_by = asc(Attribute.ORDINAL_POSITION)), > # 'primary_key' : relation(_PrimaryKey, uselist=False, > lazy=False), # At most one PK is allowed. > # 'indexes' : relation(_Index,lazy=False), > # 'foreign_keys' : relation(_ForeignKey, > lazy=False) > > }) > > I experimented with adding the properties later on after everything > else had been defined but still get the same error > > class_mapper(DatabaseTable).add_properties({ > # 'attributes' : relation(Attribute, lazy=False, > order_by = asc(Attribute.ORDINAL_POSITION)), > # 'primary_key' : relation(_PrimaryKey, uselist=False, > lazy=False), # At most one PK is allowed. > # 'indexes' : relation(_Index,lazy=False), > # 'foreign_keys' : relation(_ForeignKey, > lazy=False) > > }) > > How do I find out what is special about 'DatabaseTable' or, more > precisely, the properties I am trying to define on it. I tried putting > compile_mappers() in both the module and the driver but it has no > impact. I assume that one of 'attributes', 'primary_key', 'indexes' or > 'foreign_keys' is already in use .. OK. Let me try that: > > class_mapper(DatabaseTable).add_properties({ > # 'apple' : relation(Attribute, lazy=False, order_by > = asc(Attribute.ORDINAL_POSITION)), > # 'banana' : relation(_PrimaryKey, uselist=False, > lazy=False), # At most one PK is allowed. > 'pear' : relation(_Index,lazy=False), > # 'kiwi' : relation(_ForeignKey, lazy=False) > > }) > > No, didn't do anything. Let's try with lazy=True. OK that works. Let's > try lazy=True with the original names. OK. That works also. So the > problem appears to be with setting lazy=True for these properties. > > What is the debugging incantation to debug the orm mapping? Or do you > have any advice on how to proceed from here? > > thanks, > > pjjH > > On Apr 2, 9:20 pm, Michael Bayer <zzz...@gmail.com> wrote: > > > make sure everything that's needed is imported, and that you arent > > suppressing any exceptions which occur when the mappers first compile > > themselves. try calling compile_mappers() to force the issue. > > > On Apr 2, 8:19 pm, "phrrn...@googlemail.com" <phrrn...@googlemail.com> > > wrote: > > > > This code works when executed within a if __name__ == '__main__' > > > block in the .py that contains the model: > > > > s = MySession(bind=e) > > > q = s.query(DatabaseTable).filter(DatabaseTable.TABLE_CAT=='credit') > > > for i in q: > > > print i > > > > However, if I take it out and put it in a separate file, I get an > > > error like this. I hope that this is something simple that I am doing > > > wrong? > > > pjjH > > > > Traceback (most recent call last): > > > File "H:\work\base_python\python\chimera_driver.py", line 14, in > > > <module> > > > for i in q: > > > File "C:\PROGRA~1\Python25\lib\site-packages\sqlalchemy-0.5.2- > > > py2.5.egg\sqlalchemy\orm\query.py", line 1276, in __iter__ > > > context = self._compile_context() > > > File "C:\PROGRA~1\Python25\lib\site-packages\sqlalchemy-0.5.2- > > > py2.5.egg\sqlalchemy\orm\query.py", line 1718, in _compile_context > > > entity.setup_context(self, context) > > > File "C:\PROGRA~1\Python25\lib\site-packages\sqlalchemy-0.5.2- > > > py2.5.egg\sqlalchemy\orm\query.py", line 1972, in setup_context > > > column_collection=context.primary_columns > > > File "C:\PROGRA~1\Python25\lib\site-packages\sqlalchemy-0.5.2- > > > py2.5.egg\sqlalchemy\orm\interfaces.py", line 580, in setup > > > self.__get_context_strategy(context, path + > > > (self.key,)).setup_query(context, entity, path, adapter, **kwargs) > > > File "C:\PROGRA~1\Python25\lib\site-packages\sqlalchemy-0.5.2- > > > py2.5.egg\sqlalchemy\orm\interfaces.py", line 566, in __get_context_ > > > strategy > > > return self.strategy > > > AttributeError: 'RelationProperty' object has no attribute 'strategy' --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---