refactoring

Resolve #7779

src/models/entities/drive-folder.ts

@@ -1,49 +0,0 @@
-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;
-}