from sqlalchemy import String, Column, Integer, ForeignKey, DateTime, Index
from sqlalchemy.dialects import postgresql
from sqlalchemy.orm import relationship

from radar.database import db
from radar.models.users import User, AnonymousUser
from radar.models.logs import log_changes


@log_changes
class UserSession(db.Model):
    __tablename__ = 'user_sessions'

    id = Column(Integer, primary_key=True)

    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
    user = relationship(User)

    date = Column(DateTime(timezone=True), nullable=False)
    ip_address = Column(postgresql.INET, nullable=False)
    user_agent = Column(String, nullable=True)

    @classmethod
    def is_authenticated(cls):
        return True

Index('user_sessions_user_idx', UserSession.user_id)


class AnonymousSession(object):
    user = AnonymousUser()

    @classmethod
    def is_authenticated(cls):
        return False

from sqlalchemy import String, Column, Integer, ForeignKey, DateTime, Index
from sqlalchemy.dialects import postgresql
from sqlalchemy.orm import relationship, backref

from radar.database import db
from radar.models.users import User, AnonymousUser
from radar.models.logs import log_changes


@log_changes
class UserSession(db.Model):
    __tablename__ = 'user_sessions'

    id = Column(Integer, primary_key=True)

    user_id = Column(Integer, ForeignKey('users.id', onupdate='CASCADE', ondelete='CASCADE'), nullable=False)
    user = relationship('User', backref=backref('user_sessions', cascade='all, delete-orphan', passive_deletes=True))

    date = Column(DateTime(timezone=True), nullable=False)
    ip_address = Column(postgresql.INET, nullable=False)
    user_agent = Column(String, nullable=True)

    @classmethod
    def is_authenticated(cls):
        return True

Index('user_sessions_user_idx', UserSession.user_id)


class AnonymousSession(object):
    user = AnonymousUser()

    @classmethod
    def is_authenticated(cls):
        return False

Delete user sessions with user
Delete user sessions with user

  from sqlalchemy import String, Column, Integer, ForeignKey, DateTime, Index
  from sqlalchemy.dialects import postgresql
- from sqlalchemy.orm import relationship
+ from sqlalchemy.orm import relationship, backref
  
  from radar.database import db
  from radar.models.users import User, AnonymousUser
  from radar.models.logs import log_changes
  
  
  @log_changes
  class UserSession(db.Model):
      __tablename__ = 'user_sessions'
  
      id = Column(Integer, primary_key=True)
  
-     user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
+     user_id = Column(Integer, ForeignKey('users.id', onupdate='CASCADE', ondelete='CASCADE'), nullable=False)
-     user = relationship(User)
+     user = relationship('User', backref=backref('user_sessions', cascade='all, delete-orphan', passive_deletes=True))
  
      date = Column(DateTime(timezone=True), nullable=False)
      ip_address = Column(postgresql.INET, nullable=False)
      user_agent = Column(String, nullable=True)
  
      @classmethod
      def is_authenticated(cls):
          return True
  
  Index('user_sessions_user_idx', UserSession.user_id)
  
  
  class AnonymousSession(object):
      user = AnonymousUser()
  
      @classmethod
      def is_authenticated(cls):
          return False
  
Delete user sessions with user
## Code Before:
from sqlalchemy import String, Column, Integer, ForeignKey, DateTime, Index
from sqlalchemy.dialects import postgresql
from sqlalchemy.orm import relationship

from radar.database import db
from radar.models.users import User, AnonymousUser
from radar.models.logs import log_changes


@log_changes
class UserSession(db.Model):
    __tablename__ = 'user_sessions'

    id = Column(Integer, primary_key=True)

    user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
    user = relationship(User)

    date = Column(DateTime(timezone=True), nullable=False)
    ip_address = Column(postgresql.INET, nullable=False)
    user_agent = Column(String, nullable=True)

    @classmethod
    def is_authenticated(cls):
        return True

Index('user_sessions_user_idx', UserSession.user_id)


class AnonymousSession(object):
    user = AnonymousUser()

    @classmethod
    def is_authenticated(cls):
        return False

## Instruction:
Delete user sessions with user
## Code After:
from sqlalchemy import String, Column, Integer, ForeignKey, DateTime, Index
from sqlalchemy.dialects import postgresql
from sqlalchemy.orm import relationship, backref

from radar.database import db
from radar.models.users import User, AnonymousUser
from radar.models.logs import log_changes


@log_changes
class UserSession(db.Model):
    __tablename__ = 'user_sessions'

    id = Column(Integer, primary_key=True)

    user_id = Column(Integer, ForeignKey('users.id', onupdate='CASCADE', ondelete='CASCADE'), nullable=False)
    user = relationship('User', backref=backref('user_sessions', cascade='all, delete-orphan', passive_deletes=True))

    date = Column(DateTime(timezone=True), nullable=False)
    ip_address = Column(postgresql.INET, nullable=False)
    user_agent = Column(String, nullable=True)

    @classmethod
    def is_authenticated(cls):
        return True

Index('user_sessions_user_idx', UserSession.user_id)


class AnonymousSession(object):
    user = AnonymousUser()

    @classmethod
    def is_authenticated(cls):
        return False
