Web Reference: The error is telling you that you've used post as a name more then once for your backrefs, all you need to do is give the backref's unique names. Here's a complete example-- I've added a id primary key to the Post class, and also some __repr__ s so we get some readable output. Mar 30, 2021 · While we could consider an attribute event that checks this criterion in Python, this starts to cross the line of duplicating too much SQL behavior in Python. The backref behavior itself is only a slight transgression of this philosophy - SQLAlchemy tries to keep these to a minimum overall. Nov 2, 2023 · Since relationship.backref generates a whole new relationship(), the generation process by default will attempt to include corresponding arguments in the new relationship() that correspond to the original arguments.
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