from sqlalchemy import Column, Integer, String, ForeignKey, DateTime
from sqlalchemy.orm import relationship
from app.models.database import Base
import datetime

class CommunitySetMapping(Base):
    """社区集合映射模型，用于保存社区集合和社区的一对多关系"""
    __tablename__ = "community_set_mappings"

    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
    set_id = Column(Integer, ForeignKey("community_sets.id"), nullable=False, comment="社区集合ID")
    community_id = Column(Integer, ForeignKey("communities.id"), nullable=False, comment="社区ID")
    create_time = Column(DateTime, default=datetime.datetime.now, comment="创建时间")
    update_time = Column(DateTime, default=datetime.datetime.now, onupdate=datetime.datetime.now, comment="更新时间")