"""附件模型"""
from sqlalchemy import Column, Integer, String, BigInteger, DateTime, ForeignKey
from sqlalchemy.sql import func
from database import Base


class Attachment(Base):
    __tablename__ = "attachments"

    id = Column(Integer, primary_key=True, index=True)
    post_id = Column(Integer, nullable=True, default=None, index=True)  # 新建文章时为null，发布后回填
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    filename = Column(String(255), nullable=False)  # 原始文件名
    storage_key = Column(String(500), nullable=False)  # COS对象键
    url = Column(String(500), nullable=False)  # 完整访问URL
    file_size = Column(BigInteger, nullable=False)  # 文件大小（字节）
    file_type = Column(String(100), nullable=False)  # MIME类型
    created_at = Column(DateTime(timezone=True), server_default=func.now())