Private
Public Access
ksmithandClaude Sonnet 5
ef615e1ef4
Message.deleted_at has existed since the initial schema but was never wired up -- no WS envelope, no permission check, no frontend concept of it at all. Soft delete, author-only (mirrors the existing edit permission exactly): content and any attached image/file are cleared and the underlying MessageImage/MessageFile row and stored file are actually removed, not just detached, so the message becomes a "This message was deleted" tombstone with nothing left to recover through a stale attachment URL. A deleted message can no longer be edited or reacted to. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
57 lines
2.9 KiB
Python
57 lines
2.9 KiB
Python
import uuid
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from datetime import datetime
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from sqlalchemy import CheckConstraint, DateTime, ForeignKey, String, Text, func
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from app.models.base import Base
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class Message(Base):
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__tablename__ = "messages"
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__table_args__ = (
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# #53: a deleted message clears content/image_id/file_id entirely
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# (see message_service.delete_message) -- the "must have something"
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# rule only applies while the message is actually live.
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CheckConstraint(
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"content IS NOT NULL OR image_id IS NOT NULL OR file_id IS NOT NULL "
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"OR deleted_at IS NOT NULL",
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name="messages_content_or_attachment_required",
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),
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)
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id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
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room_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("rooms.id"), index=True, nullable=False)
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user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"), nullable=False)
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# Nullable since Phase "image uploads": a message can be an image with
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# no caption. The CheckConstraint above still requires at least one of
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# content/image_id/file_id.
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content: Mapped[str | None] = mapped_column(Text)
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image_id: Mapped[uuid.UUID | None] = mapped_column(ForeignKey("message_images.id"))
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file_id: Mapped[uuid.UUID | None] = mapped_column(ForeignKey("message_files.id"))
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# First http(s) URL found in content at creation time (see
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# link_preview_service.extract_first_url), if any -- a plain string, not
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# a FK, since the actual preview data lives in link_previews cached by
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# URL and is looked up separately (see message_service.list_recent_
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# messages), not eager-loaded as an ORM relationship.
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preview_url: Mapped[str | None] = mapped_column(String(2048))
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# clock_timestamp(), not now()/func.now() -- the WS handler (ws/chat.py)
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# shares one AsyncSession for a whole connection's lifetime, and a
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# read-only op (e.g. a "join" frame's membership check) can leave a
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# transaction open with nothing to commit it until the next write.
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# Postgres's now()/CURRENT_TIMESTAMP returns the *transaction's* start
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# time in that case, not the actual INSERT's -- confirmed live to be the
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# actual cause of #45 (a reply sent well after an idle read-only period
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# got timestamped to when that period started, sorting it before
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# messages that were genuinely sent earlier). clock_timestamp() always
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# reflects the real moment of execution regardless of transaction age.
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created_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), server_default=func.clock_timestamp(), index=True, nullable=False
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)
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edited_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
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deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
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user = relationship("User")
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image = relationship("MessageImage")
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file = relationship("MessageFile")
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