flask sqlalchemy one-to-one relationship issues - flask

Question

I am trying to set up a one-to-one relationship in flask. I have a script that runs db.drop_all() when I want to clear my DB. But I am getting cascade errors when doing that. I have played with many combinations using cascade and single_parent arguments in the model relationships and nothing is working. Any help would be appreciated to help set up a one-to-one relationship that will allow me to use db.drop_all() without error. Below is my latest iteration.
from sqlalchemy.sql import func
from project import db, bcrypt
class User(db.Model):
__tablename__ = 'user'
id = db.Column(db.Integer, primary_key=True, autoincrement=True)
email = db.Column(db.String(150), nullable=False)
password = db.Column(db.String(250), nullable=False)
active = db.Column(db.Boolean(), default=True, nullable=False)
created_date = db.Column(db.DateTime, default=func.now(), nullable=False)
profile = db.relationship("Profile", cascade="all, delete, delete-orphan")
def __init__(self, email, password):
self.email = email
self.password = bcrypt.generate_password_hash(password).decode('utf-8')
class Profile(db.Model):
__tablename__ = 'profile'
id = db.Column(db.Integer, primary_key=True, autoincrement=True)
first_name = db.Column(db.String(150), nullable=True)
last_name = db.Column(db.String(250), nullable=True)
github_url = db.Column(db.String(250), nullable=True)
user_id = db.Column(db.Integer, db.ForeignKey("user.id"), nullable=False)
user = db.relationship("User")

Answer 1

from sqlalchemy.sql import func
from project import db, bcrypt
class User(db.Model):
__tablename__ = 'user'
id = db.Column(db.Integer, primary_key=True, autoincrement=True)
email = db.Column(db.String(150), nullable=False)
...
def __init__(self, email, password):
self.email = email
self.password = bcrypt.generate_password_hash(password).decode('utf-8')
class Profile(db.Model):
__tablename__ = 'profile'
id = db.Column(db.Integer, primary_key=True, autoincrement=True)
first_name = db.Column(db.String(150), nullable=True)
user_id = db.Column(db.Integer, db.ForeignKey("user.id"), nullable=False)
...
user = db.relationship(
'User', cascade='all', backref=db.backref('profile', cascade='all'))
note how relationship between the two models is defined in profile model only.