首个可运行的版本

2026-06-12 23:14:12 +08:00
commit b3d90c65f8
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+"""会话模型（私聊 + 群聊）"""
+
+from datetime import datetime, timezone
+
+from sqlalchemy import String, DateTime, ForeignKey, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class Conversation(Base):
+    __tablename__ = "conversations"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True)
+    type: Mapped[str] = mapped_column(String(20), nullable=False)  # private / group
+    name: Mapped[str | None] = mapped_column(String(100), nullable=True)  # 群聊名称
+    avatar_url: Mapped[str | None] = mapped_column(String(500), nullable=True)  # 群头像
+    description: Mapped[str | None] = mapped_column(String(500), nullable=True)  # 群描述
+    creator_id: Mapped[str | None] = mapped_column(String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
+    last_message_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
+    last_message_preview: Mapped[str | None] = mapped_column(String(200), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.utcnow())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        default=lambda: datetime.utcnow(),
+        onupdate=lambda: datetime.utcnow(),
+    )
+
+    # 关系
+    members = relationship("ConversationMember", back_populates="conversation", cascade="all, delete-orphan")
+    messages = relationship("Message", back_populates="conversation", cascade="all, delete-orphan")
+    creator = relationship("User", foreign_keys=[creator_id])