Re: [sqlalchemy] Dynamically creating relationships from polymorphic subclasses to one class

Of course! Thanks for the quick reply, I was afraid/hoping it would be something simple I was missing -- I wasn't aware that it was required on both sides of a bi-directional relationship, but that makes sense. I'm using 1.3.17 and it does the same, I just only copied the first part of the

Re: [sqlalchemy] Dynamically creating relationships from polymorphic subclasses to one class

hi and thanks for the straightforward test case. I'm not sure if that's an old version of SQLAlchemy you're using, when I run with current 1.3.18 release the error message is more descriptive: "Could not determine join condition between parent/child tables on relationship ACollection.members -

[sqlalchemy] Dynamically creating relationships from polymorphic subclasses to one class

I have SQLA classes in a project that have date and data components and I'm attempting to create a single base-class that I can subclass to create statistics for all points of data during some interval, but I want the interval subclasses to maintain references to their sub-data such that if I