186 lines
5.7 KiB
Python
186 lines
5.7 KiB
Python
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from typing import TYPE_CHECKING, Optional
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from enum import StrEnum
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from sqlmodel import Field, Relationship, UniqueConstraint, CheckConstraint, Index
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from .base import TableBase
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if TYPE_CHECKING:
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from .user import User
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from .policy import Policy
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from .source_link import SourceLink
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from .share import Share
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class ObjectType(StrEnum):
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"""对象类型枚举"""
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FILE = "file"
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FOLDER = "folder"
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class Object(TableBase, table=True):
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"""
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统一对象模型
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合并了原有的 File 和 Folder 模型，通过 type 字段区分文件和目录。
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根目录规则：
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- 每个用户有一个显式根目录对象（name="~", parent_id=NULL）
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- 用户创建的文件/文件夹的 parent_id 指向根目录或其他文件夹的 id
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- 根目录的 policy_id 指定用户默认存储策略
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"""
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__table_args__ = (
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# 同一父目录下名称唯一（包括 parent_id 为 NULL 的情况）
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UniqueConstraint("owner_id", "parent_id", "name", name="uq_object_parent_name"),
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# 名称不能包含斜杠
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CheckConstraint(
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"name NOT LIKE '%/%' AND name NOT LIKE '%\\%'",
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name="ck_object_name_no_slash",
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),
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# 性能索引
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Index("ix_object_owner_updated", "owner_id", "updated_at"),
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Index("ix_object_parent_updated", "parent_id", "updated_at"),
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Index("ix_object_owner_type", "owner_id", "type"),
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Index("ix_object_owner_size", "owner_id", "size"),
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)
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# ==================== 基础字段 ====================
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name: str = Field(max_length=255)
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"""对象名称（文件名或目录名）"""
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type: ObjectType
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"""对象类型：file 或 folder"""
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# ==================== 文件专属字段 ====================
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source_name: str | None = None
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"""源文件名（仅文件有效）"""
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size: int = Field(default=0, sa_column_kwargs={"server_default": "0"})
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"""文件大小（字节），目录为 0"""
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upload_session_id: str | None = Field(default=None, max_length=255, unique=True, index=True)
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"""分块上传会话ID（仅文件有效）"""
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file_metadata: str | None = None
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"""文件元数据 (JSON格式)，仅文件有效"""
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# ==================== 外键 ====================
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parent_id: int | None = Field(default=None, foreign_key="object.id", index=True)
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"""父目录ID，NULL 表示这是用户的根目录"""
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owner_id: int = Field(foreign_key="user.id", index=True)
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"""所有者用户ID"""
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policy_id: int = Field(foreign_key="policy.id", index=True)
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"""存储策略ID（文件直接使用，目录作为子文件的默认策略）"""
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# ==================== 关系 ====================
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owner: "User" = Relationship(back_populates="objects")
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"""所有者"""
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policy: "Policy" = Relationship(back_populates="objects")
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"""存储策略"""
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# 自引用关系
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parent: Optional["Object"] = Relationship(
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back_populates="children",
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sa_relationship_kwargs={"remote_side": "Object.id"},
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)
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"""父目录"""
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children: list["Object"] = Relationship(back_populates="parent")
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"""子对象（文件和子目录）"""
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# 仅文件有效的关系
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source_links: list["SourceLink"] = Relationship(back_populates="object")
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"""源链接列表（仅文件有效）"""
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shares: list["Share"] = Relationship(back_populates="object")
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"""分享列表"""
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# ==================== 业务属性 ====================
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@property
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def is_file(self) -> bool:
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"""是否为文件"""
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return self.type == ObjectType.FILE
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@property
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def is_folder(self) -> bool:
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"""是否为目录"""
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return self.type == ObjectType.FOLDER
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# ==================== 业务方法 ====================
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@classmethod
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async def get_root(cls, session, user_id: int) -> "Object | None":
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"""
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获取用户的根目录
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:param session: 数据库会话
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:param user_id: 用户ID
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:return: 根目录对象，不存在则返回 None
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"""
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return await cls.get(
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session,
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(cls.owner_id == user_id) & (cls.parent_id == None)
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)
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@classmethod
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async def get_by_path(cls, session, user_id: int, path: str) -> "Object | None":
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"""
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根据路径获取对象
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:param session: 数据库会话
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:param user_id: 用户ID
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:param path: 路径，如 "/" 或 "/docs/images"
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:return: Object 或 None
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"""
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path = path.strip()
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if not path or path == "/" or path == "~":
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return await cls.get_root(session, user_id)
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# 移除开头的斜杠并分割路径
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if path.startswith("/"):
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path = path[1:]
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parts = [p for p in path.split("/") if p]
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if not parts:
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return await cls.get_root(session, user_id)
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# 从根目录开始遍历
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current = await cls.get_root(session, user_id)
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for part in parts:
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if not current:
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return None
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current = await cls.get(
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session,
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(cls.owner_id == user_id) &
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(cls.parent_id == current.id) &
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(cls.name == part)
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)
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return current
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@classmethod
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async def get_children(cls, session, user_id: int, parent_id: int) -> list["Object"]:
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"""
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获取目录下的所有子对象
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:param session: 数据库会话
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:param user_id: 用户ID
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:param parent_id: 父目录ID
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:return: 子对象列表
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"""
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return await cls.get(
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session,
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(cls.owner_id == user_id) & (cls.parent_id == parent_id),
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fetch_mode="all"
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)
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