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 ?
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