# # models.py
# from sqlalchemy import Column, Integer, String, ForeignKey, DateTime, func, Boolean
# from sqlalchemy.orm import relationship
# from src.models.base import BaseModel

# class Choice(BaseModel):
#     """
#     Represents a single answer choice for a question.
#     """
#     __tablename__ = "choices"
    
#     id = Column(Integer, primary_key=True, index=True)
#     question_id = Column(Integer, ForeignKey("questions.id", ondelete="CASCADE"), nullable=False)
#     content = Column(String(255), nullable=False)
#     is_correct = Column(Boolean, nullable=False, default=False)
#     explanation = Column(String(255), nullable=True)

#     created_at = Column(DateTime(timezone=True), server_default=func.now())  
#     updated_at = Column(DateTime(timezone=True), onupdate=func.now(), server_default=func.now())  

#     # Relationships
#     question = relationship("Question", back_populates="choices")
    
#     def __repr__(self):
#         return f"<Choice id={self.id}, question_id={self.question_id}, is_correct={self.is_correct}>"