refactoring

Resolve #7779

packages/backend/src/models/entities/drive-folder.ts

@@ -0,0 +1,49 @@
+import { JoinColumn, ManyToOne, Entity, PrimaryColumn, Index, Column } from 'typeorm';
+import { User } from './user';
+import { id } from '../id';
+
+@Entity()
+export class DriveFolder {
+	@PrimaryColumn(id())
+	public id: string;
+
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the DriveFolder.'
+	})
+	public createdAt: Date;
+
+	@Column('varchar', {
+		length: 128,
+		comment: 'The name of the DriveFolder.'
+	})
+	public name: string;
+
+	@Index()
+	@Column({
+		...id(),
+		nullable: true,
+		comment: 'The owner ID.'
+	})
+	public userId: User['id'] | null;
+
+	@ManyToOne(type => User, {
+		onDelete: 'CASCADE'
+	})
+	@JoinColumn()
+	public user: User | null;
+
+	@Index()
+	@Column({
+		...id(),
+		nullable: true,
+		comment: 'The parent folder ID. If null, it means the DriveFolder is located in root.'
+	})
+	public parentId: DriveFolder['id'] | null;
+
+	@ManyToOne(type => DriveFolder, {
+		onDelete: 'SET NULL'
+	})
+	@JoinColumn()
+	public parent: DriveFolder | null;
+}