I have two classes, Artwork and Person. Artwork has a relationship to Person.
However, when I try to use them, I get an error thrown: InvalidRequestError: When initializing mapper Mapper|Artwork|artwork, > expression 'Person' failed to locate a name ("name 'Person' is not > defined"). If this is a class name, consider adding this relationship() to > the <class 'model.Artwork'> class after both dependent classes have been > defined. Here are the classes themselves, defined in model/__init__.py class Artwork(db.Model, SimpleSerializeMixin): id = db.Column(db.Integer, primary_key=True) .... artist_id = db.Column(db.String(256), db.ForeignKey('person.sub')) artist = db.relationship('Person', backref='artworks') class Person(db.Model, SimpleSerializeMixin): sub = db.Column(db.String(256), primary_key=True) I checked with debugger and in sqlalchemy/ext/declarative/clsregistry.py (_class_resolver.__call__()) there is a line: x = eval(self.arg, globals(), self._dict) No "Person" or "Artwork" or any other class defined in the file are present in globals(). self._dict is empty So it fails with an NameError exception. What could be the issue ? -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.