Nestjs递归菜单树结构

方法1：

buildMenuTree (menuList: Menu[], pid: string): MenuTree[] {
    let result: MenuTree[] = [];
    menuList.forEach(menu => {
      const menuTree = new MenuTree();
      menuTree.id = menu.id;
      menuTree.name = menu.name;
      menuTree.code = menu.code;
      menuTree.route = menu.route;
      if (menu.parentId === pid) {
        menuTree.children = this.buildMenuTree(menuList, menu.id);
        result.push(menuTree);
      }
    });
    console.log(result);
    return result;
  }
  
  

方法2

buildMenuTree (menuList: Menu[], pid: string): MenuTree[] {
    let result: MenuTree[] = [];
    for (var i = 0; i < menuList.length; i++) {
      if (menuList[i].parentId == pid) {
        var menuTree: MenuTree = new MenuTree();
        menuTree.id = menuList[i].id;
        menuTree.name = menuList[i].name;
        menuTree.code = menuList[i].code;
        menuTree.route = menuList[i].route;
        menuTree.children = this.buildMenuTree(menuList, menuList[i].id);
        result.push(menuTree)
      }
    } 
    console.log(result);
    return result;
  }

查询调用

// 分页查询，带条件查询
  async findPage (userQuery: MenuQuery): Promise<PageResult<any>> {
    const queryBuilder = this.repository.createQueryBuilder('menu');
    console.log(userQuery);
    queryBuilder.where('user.deleted=0');
    if (userQuery) {
      let { pageIndex, pageSize } = userQuery;
      if (pageIndex || pageIndex === 0) pageIndex = 1;
      if (pageSize || pageSize === 0) pageSize = 10;
      queryBuilder
        .take(pageSize) //Sets maximal number of entities to take.
        .skip(pageSize * (pageIndex - 1)); //Sets number of entities to skip.
    }
    if (userQuery.enabled) {
      queryBuilder.where('menu.enabled=' + userQuery.enabled);
    } else {
      queryBuilder.where('menu.enabled=0');
    }
    const result = new PageResult<MenuTree>();
    const [entities, total] = await queryBuilder.getManyAndCount();
    const treeData: MenuTree[] = this.buildMenuTree(entities, '');
    result.data = treeData;
    result.total = total;
    result.pageIndex = userQuery.pageIndex;
    result.pageSize = userQuery.pageSize;
    return result;
  }

数据对象

export class MenuTree {
  id: string;
  name: string;
  code: string;
  route: string;
  children: MenuTree[]
}

返回数据内容

{
  "data": {
    "data": [
      {
        "id": "0e3bd2dd-bce8-4f89-9b11-e2a92228f70b",
        "name": "系统管理",
        "code": "string",
        "route": "/system",
        "children": [
          {
            "id": "60d5e4dc-0d4b-4712-9df0-f0044d7d79df",
            "name": "用户管理",
            "code": "string",
            "route": "/users",
            "children": []
          },
          {
            "id": "af5d069e-a7fc-4f95-b64e-a6aa5650c2c4",
            "name": "菜单管理",
            "code": "string",
            "route": "/menus",
            "children": []
          }
        ]
      },
      {
        "id": "ccd39ca0-5ac8-4e1f-bf61-a90317d47fbe",
        "name": "商品管理",
        "code": "shops",
        "route": "/shops",
        "children": [
          {
            "id": "3552d84f-4328-48d4-80ce-b5cd13826d79",
            "name": "商品列表",
            "code": "shops",
            "route": "/shop",
            "children": []
          }
        ]
      }
    ],
    "total": 5,
    "pageIndex": "1",
    "pageSize": "10"
  },
  "code": 200,
  "msg": "请求成功"
}