CODE EXAMPLE FOR PYTHON

flask sqlalchemy single table inheritance

class User(db.Model):
    __tablename__ = 'tbl_user'
    type = db.Column(db.String(32)) 
    ...
    __mapper_args__ = {
        'polymorphic_identity': 'user',
        'polymorphic_on': type,
    }  # remove with_polymorphic

class Tourist(User):
    __tablename__ = None  # Add table name to be None
    __mapper_args__ = {
        'polymorphic_identity': 'tourist'
    }
    ...

class Guide(User):
    __tablename__ = None  # Add table name to be None
    __mapper_args__ = {
        'polymorphic_identity': 'guide'
    }
    ...