auto id length in bi ref: project

app/models/project.py

@@ -1,14 +1,27 @@
+from typing import TYPE_CHECKING
 from sqlalchemy import Column, DateTime, String, ForeignKey, Integer
 from sqlalchemy.sql import func
 from .base import AutoID, Base
 
+if TYPE_CHECKING:
+    from .workspace import Workspace
+
 class ProjectItem(Base, AutoID):
     """项目与文件夹的树状虚拟文件系统"""
     __tablename__ = "project_items"
 
-    workspace_id = Column(String(32), ForeignKey("workspaces.id", ondelete="CASCADE"), index=True)
+    workspace_id = Column(
+        String(Workspace.id_length()),
+        ForeignKey("workspaces.id", ondelete="CASCADE"),
+        index=True,
+    )
     # 自引用外键：如果是根目录下的顶级节点，则 parent_id 为 Null
-    parent_id = Column(String(32), ForeignKey("project_items.id", ondelete="CASCADE"), nullable=True, index=True)
+    parent_id = Column(
+        String(AutoID.id_length()),     # 其实调用的就是自身的 id_length 方法
+        ForeignKey("project_items.id", ondelete="CASCADE"),
+        nullable=True,
+        index=True,
+    )
     
     name = Column(String, nullable=False)
     # 节点类型：'folder' (文件夹) 或 'project' (代表具体文件的项目实体)