Senko-san
56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
"""ORM models for playlists and their ordered tracks."""
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import datetime as dt
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import uuid
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from sqlalchemy import DateTime, Float, ForeignKey, Integer, String, UniqueConstraint, func
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from sqlalchemy.orm import Mapped, mapped_column
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from app.infrastructure.db.base import Base
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from app.infrastructure.db.models.mixins import TimestampMixin, UUIDPrimaryKeyMixin
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class PlaylistModel(UUIDPrimaryKeyMixin, TimestampMixin, Base):
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__tablename__ = "playlists"
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name: Mapped[str] = mapped_column(String(512), nullable=False)
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description: Mapped[str | None] = mapped_column(String(2048), nullable=True)
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owner_id: Mapped[uuid.UUID] = mapped_column(
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ForeignKey("users.id", ondelete="CASCADE"),
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index=True,
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nullable=False,
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)
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cover_path: Mapped[str | None] = mapped_column(String(1024), nullable=True)
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# Optimistic-locking / future sync counter — bumped on every mutation.
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version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
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class PlaylistTrackModel(UUIDPrimaryKeyMixin, Base):
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"""A track's membership in a playlist.
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``position`` is a float so a track can be inserted between two others
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without reindexing the whole list (plan §4).
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"""
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__tablename__ = "playlist_tracks"
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__table_args__ = (
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UniqueConstraint("playlist_id", "track_id", name="uq_playlist_tracks_playlist_id_track_id"),
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)
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playlist_id: Mapped[uuid.UUID] = mapped_column(
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ForeignKey("playlists.id", ondelete="CASCADE"),
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index=True,
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nullable=False,
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)
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track_id: Mapped[uuid.UUID] = mapped_column(
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ForeignKey("tracks.id", ondelete="CASCADE"),
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index=True,
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nullable=False,
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)
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position: Mapped[float] = mapped_column(Float, nullable=False)
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added_at: Mapped[dt.datetime] = mapped_column(
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DateTime(timezone=True),
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server_default=func.now(),
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nullable=False,
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)
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