from sqlalchemy import Column, Integer, ForeignKey
from sqlalchemy.orm import relationship

from crudkit.core.base import CRUDMixin

from muck.models.dbref import Dbref, ObjectType

class Exit(Dbref):
    __tablename__ = "exits"

    id = Column(Integer, ForeignKey("dbref.id"), primary_key=True)

    destination_id = Column(Integer, ForeignKey("dbref.id"), nullable=True)
    destination = relationship("Dbref", remote_side=[CRUDMixin.id], foreign_keys=[destination_id])

    __mapper_args__ = {
        "polymorphic_identity": ObjectType.EXIT
    }