Hi,
Hope you are well. I'm having a bit of trouble with something and would
love it if someone could please share some of their wisdom with me.
My program uses single table inheritance to store polymorphic objects,
one of which is a HttpTest. However, the spanner in the works seems to
be that I need my program to process HttpTest objects from two different
sources.
Most of the HttpTest objects will come from the database in ORM form via
SQLA; but then, some other HttpTest objects will be instantiated
manually from the program's configuration file parser.
The end result is that all the HttpTest objects get added to a
'hosttests' dictionary, which some code uses to iterate over and process
them. The processing basically consists of checking some of the HttpTest
attributes and then, if necessary, adding them into an event scheduler.
The problem I seem to be having, is that when the processing code
encounters a HttpTest object that was not created by SQLA (and it tries
to access its attributes), I get the following error:
File
"/usr/local/lib/python2.6/site-packages/SQLAlchemy-0.5.5-py2.6.egg/sqlalchemy/orm/attributes.py",
line 158, in __get__
return self.impl.get(instance_state(instance), instance_dict(instance))
AttributeError: 'HttpTest' object has no attribute '_sa_instance_state'
I'm not exactly sure what is going on here, but it seems like SQLA is
trying to lookup my "config generated" HttpTest object, and fails
because SQLA (quite understandable) has no record of it. Does this make
sense to anyone?
Any help or advice would be greatly appreciated. Thank you in advance
for your time and consideration.
Kind regards,
moggie
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