one-one relation sqlalchemy flask - flask

Question

I am trying to implement 1-1 relation for User and Profile Tabels like below.
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(255), unique=True)
password = db.Column(db.String(255))
active = db.Column(db.Boolean())
confirmed_at = db.Column(db.DateTime(), default=datetime.now())
roles = db.relationship('Role', secondary=roles_users,
backref=db.backref('users', lazy='dynamic'))
def __repr__(self):
return '<User {self.email}>'.format(self=self)
class CustomerProfile(db.Model):
__tablename__ = 'customer_profiles'
id = db.Column(db.Integer(), primary_key=True)
full_name = db.Column(db.String(200), nullable=True)
user_id = db.Column(db.Integer(), db.ForeignKey('user.id'), unique=True)
user = db.relationship('User', backref=db.backref("CustomerProfile", uselist=False))
def __repr__(self):
return '<CustomerProfile {self.full_name}>'.format(self=self)
My question is:
Is this the correct representation of 1-1 mapping? Cause when I try to reverse engineer the database with MySQL Workbench, it does show me one to many mapping
If this is the correct representation, then inserting a duplicate row is being allowed unless I give unique=True in user_id. I would have expected that since I told MySql about the mapping, it should not allow duplicate row...Is that not true?
after having a look at http://docs.sqlalchemy.org/en/latest/orm/basic_relationships.html#one-to-one
I changed my code to below:
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(255), unique=True)
password = db.Column(db.String(255))
active = db.Column(db.Boolean())
confirmed_at = db.Column(db.DateTime(), default=datetime.now())
roles = db.relationship('Role', secondary=roles_users,
backref=db.backref('users', lazy='dynamic'))
customer_profiles = db.relationship('CustomerProfile', uselist=False, back_populates="user")
def __repr__(self):
return '<User {self.email}>'.format(self=self)
class CustomerProfile(db.Model):
__tablename__ = 'customer_profiles'
id = db.Column(db.Integer(), primary_key=True)
full_name = db.Column(db.String(200), nullable=True)
user_id = db.Column(db.Integer(), db.ForeignKey('user.id'))
user = db.relationship('User', back_populates='customer_profiles')
def __repr__(self):
return '<CustomerProfile {self.full_name}>'.format(self=self)
but still, I am able to insert a duplicate row into profiles....
Since I am mapping it at the DB level, I am assuming that DB will stop me from inserting a duplicate row even though I do not give unique=True.. Is my understanding correct?