用 ORM (TypeORM) 设计三维关系

Question

我尝试创建一个包含用户、组、文档和权限的数据库架构。

• 用户可以加入多个群组
• 组可以有多个用户
• 用户可以拥有文档权限
• 群组可以拥有文档权限
• 权限可以是任何东西，不仅仅适用于文档

我试图为此创建一个小图形

我开始设计实体

用户

@Entity('User')
export class UserEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @ManyToMany((type: any) => GroupEntity, (group: GroupEntity) => group.users)
  @JoinTable()
  groups: GroupEntity[];

  @ManyToMany((type: any) => DocumentEntity, (document: DocumentEntity) => document.users)
  @JoinTable()
  documents: DocumentEntity[];
}

组

@Entity('Group')
export class GroupEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @ManyToMany((type: any) => UserEntity, (user: UserEntity) => user.groups)
  users: UserEntity[];

  @ManyToMany((type: any) => DocumentEntity, (document: DocumentEntity) => document.groups)
  @JoinTable()
  documents: DocumentEntity[];
}

文档

@Entity('Document')
export class DocumentEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @ManyToMany((type: any) => UserEntity, (user: UserEntity) => user.documents)
  users: UserEntity[];

  @ManyToMany((type: any) => GroupEntity, (group: GroupEntity) => group.documents)
  groups: GroupEntity[];
}

当涉及到文档的权限时，您会看到 3 个表、用户/组、文档和权限之间存在关系。

1. 我将 TypeORM 用于 REST API (NestJs)，但我不确定权限是否为实体。由于我正在设计 REST 端点，这个权限实体将是多个端点的共享实体。

2. 如何扩展我的实体以获得这些权限？

...也许你会想出更好的数据库设计:)

Answer 1

在这种情况下，建议手动处理它，创建一个实体类 CrossGroupDocumentPermissionEntity 并为每个关系添加一个 ManyToOne，在 Document、Group、User 的另一侧添加一个 OneToMany 关系here 是一个示例在带有自定义字段的多对多中使用

编辑：

用户

@Entity('User')
export class UserEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @ManyToMany((type: any) => GroupEntity, (group: GroupEntity) => group.users)
  @JoinTable()
  groups: GroupEntity[];

  @OneToMany((type: any) => CrossUserDocumentPermissionEntity, (documentPermission: CrossUserDocumentPermissionEntity) => documentPermission.user)
  documentPermissions: CrossUserDocumentPermissionEntity[];
}

组

@Entity('Group')
export class GroupEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @ManyToMany((type: any) => UserEntity, (user: UserEntity) => user.groups)
  users: UserEntity[];

  @OneToMany((type: any) => CrossGroupDocumentPermissionEntity, (documentPermission: CrossGroupDocumentPermissionEntity) => documentPermission.group)
  documentPermissions: CrossGroupDocumentPermissionEntity[];
}

权限

@Entity('Permission')
export class PermissionEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @OneToMany((type: any) => CrossUserDocumentPermissionEntity, (userDocument: CrossUserDocumentPermissionEntity) => userDocument.permission)
  usersDocuments: CrossUserDocumentPermissionEntity[];

  @OneToMany((type: any) => CrossGroupDocumentPermissionEntity, (groupDocument: CrossUserDocumentPermissionEntity) => groupDocument.permission)
  GroupDocuments: CrossGroupDocumentPermissionEntity[];
}

文档

@Entity('Document')
export class DocumentEntity {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @OneToMany((type: any) => CrossUserDocumentPermissionEntity, (userPermission: CrossUserDocumentPermissionEntity) => userPermission.document)
  usersPermissions: CrossUserDocumentPermissionEntity[];

  @OneToMany((type: any) => CrossGroupDocumentPermissionEntity, (groupPermission: CrossUserDocumentPermissionEntity) => groupPermission.document)
  GroupPermissions: CrossGroupDocumentPermissionEntity[];
}

Cross_User_Document_Permission

@Entity('Cross_User_Document_Permission')
export class CrossUserDocumentPermissionEntity {
  @PrimaryColumn()
  userId: string;

  @PrimaryColumn()
  permissionId: string;

  @PrimaryColumn()
  documentId: string;

  @ManyToOne((type: any) => UserEntity, (user: UserEntity) => user.documentPermission)
  user: UserEntity;

  @ManyToOne((type: any) => DocumentEntity, (document: DocumentEntity) => document.userPermission)
  document: DocumentEntity;

  @ManyToOne((type: any) => PermissionEntity, (permission: PermissionEntity) => permission.userDocument)
  permission: PermissionEntity;
}