Flask-SqlAlchemy Adjacency List Relationship backfref unexpected error

python orm sqlalchemy flask flask-sqlalchemy

You configure the relationship in a wrong way. Please do this one:

from sqlalchemy.orm import backrefclass Node(db.Model):    # ...    children = db.relationship('Node', backref=backref('parent', remote_side=[id]))

class Node(db.Model):    # ...    parent = db.relationship("Node", backref='children', remote_side=[id])

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