33 lines
1.5 KiB
Python
33 lines
1.5 KiB
Python
"""会话模型（私聊 + 群聊）"""
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from datetime import datetime, timezone
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from sqlalchemy import String, DateTime, ForeignKey, Text
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from app.database import Base
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class Conversation(Base):
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__tablename__ = "conversations"
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id: Mapped[str] = mapped_column(String(36), primary_key=True)
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type: Mapped[str] = mapped_column(String(20), nullable=False) # private / group
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name: Mapped[str | None] = mapped_column(String(100), nullable=True) # 群聊名称
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avatar_url: Mapped[str | None] = mapped_column(String(500), nullable=True) # 群头像
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description: Mapped[str | None] = mapped_column(String(500), nullable=True) # 群描述
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creator_id: Mapped[str | None] = mapped_column(String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
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last_message_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
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last_message_preview: Mapped[str | None] = mapped_column(String(200), nullable=True)
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created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())
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updated_at: Mapped[datetime] = mapped_column(
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DateTime,
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default=lambda: datetime.utcnow(),
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onupdate=lambda: datetime.utcnow(),
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)
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# 关系
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members = relationship("ConversationMember", back_populates="conversation", cascade="all, delete-orphan")
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messages = relationship("Message", back_populates="conversation", cascade="all, delete-orphan")
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creator = relationship("User", foreign_keys=[creator_id])
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