不确定如何在@ngrx/data中执行"join“操作

import { createFeatureSelector, createSelector } from '@ngrx/store';
import { EntityAdapter, createEntityAdapter } from '@ngrx/entity';
import { EntityState } from '@ngrx/entity';

// 定义实体
interface User {
  id: number;
  name: string;
  roleId: number;
}

// 创建实体适配器
const userAdapter: EntityAdapter<User> = createEntityAdapter<User>();

// 创建实体状态
interface UserState extends EntityState<User> {}

// 创建初始状态
const initialState: UserState = userAdapter.getInitialState();

// 创建特性选择器
const getUserState = createFeatureSelector<UserState>('users');

// 创建实体选择器
const {
  selectAll: selectAllUsers,
  selectEntities: selectUserEntities,
  selectIds: selectUserIds,
  selectTotal: selectUserTotal,
} = userAdapter.getSelectors(getUserState);

// 创建连接选择器
const selectUsersWithRoles = createSelector(
  selectAllUsers,
  selectRoleEntities,
  (users, roles) => {
    return users.map(user => ({
      ...user,
      role: roles[user.roleId],
    }));
  }
);

// 使用连接选择器获取数据
const usersWithRoles = useSelector(selectUsersWithRoles);

// 执行"join"操作
console.log(usersWithRoles);