class Address(Base):
    __tablename__='addresses'
    id = Column(Integer,primary_key=True)
    email_address = Column(String,nullable=False)
    user_id = Column(Integer,ForeignKey('users.id'))
    user = relationship(back_populates="addresses")

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer,primary_key=True)
    name = Column(String)
    fullname = Column(String)
    password = Column(String)
    addresses = relationship('Address',back_populates='user',
                 cascade="all, delete, delete-orphan")