from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
from sqlalchemy.orm import relationship

from .base import Base as BaseModel


class User(BaseModel, declarative_base()):
     __tablename__ = 'users'

     id = Column(Integer, primary_key=True)
     username = Column(String(16))
     password = Column(String(16))
     nickname = Column(String(16))
     secret_question = Column(String(50))
     secret_answer = Column(String(50))
     role = Column(Integer)
     is_banned = relationship("BannedUser", uselist=False, back_populates='users')

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, DateTime, ForeignKey
from sqlalchemy.orm import relationship

from .base import Base as BaseModel


class BannedUser(BaseModel, declarative_base()):
     __tablename__ = 'banned_users'

     id = Column(Integer, primary_key=True)
     user_id = Column(Integer, ForeignKey('users.id'))
     user = relationship('User', back_populates='banned_users')
     reason = Column(String)
     time_end = Column(DateTime)

...

class User(BaseModel, declarative_base()):
    __tablename__ = 'users'

    ...
    is_banned = relationship("BannedUser", uselist=False, back_ref='user')
    ...

...

class User(BaseModel, declarative_base()):
    __tablename__ = 'users'

    ...
    is_banned = relationship("BannedUser", uselist=False, back_populates='user')
    ...

class BannedUser(BaseModel, declarative_base()):
    __tablename__ = 'banned_users'

    ...
    user = relationship('User', back_populates='is_banned')
    ...