如何显示部门内部的用户

Question

这是我的页面DepartmentController.php，我编写了一个函数来检查ID为0（根）和子代的部门。在我的数据库中，我有两个表用户，部门与他们之间存在一对多关系。部门可以但是我想显示部门内部的用户，我试图在这些功能中添加此用户，但是它只显示一个用户，而没有显示在正确的部门中。我也尝试添加此功能，但它给了我这个错误：未定义变量：用户

   if(count($departments->$user)) {
                    echo '<br>' .$user->username.'</br>';
                }

$users =  DB::table('users')
            ->join('departments', 'users.department', '=', 'departments.id')
            ->select('users.id','users.lastname','users.name as username','departments.name')->get();
//print_r($users);exit;
foreach($users as $user)
{
 // dd($user->username);
}

DepartmentsController.php

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use  App\Department;
use  App\User;
use Illuminate\Support\Facades\DB;

class DepartmentController extends Controller
{

    public function treeView(){       
        $departments =  Department::where('parent', '=', 0)->get();

         $tree='<ul id="browser" class="filetree"><li class="tree-view"></li>';
        foreach ($departments as $department) {
             $tree .='<li class="tree-view closed"<a class="tree-name">'.$department->name.'</a>'; //first department
             if(count($department->childs)) {
                $tree .=$this->childView($department);// if this department has children
            }
        }
        $tree .='</ul>';
         //return $tree;
        return view('admin.page',compact('tree'));
    }
    public function childView($department){                 
            $html ='<ul>';


            $users =  DB::table('users')
            ->join('departments', 'users.department', '=', 'departments.id')
            ->select('users.id','users.lastname','users.name as username','departments.name')->get();
            //print_r($users);exit;
            foreach($users as $user)
            {

             // dd($user->username);
            }


            foreach ($department->childs as $arr) {
                if(count($arr->childs))
                {
                $html .='<li class="tree-view closed"><a class="tree-name">'.$arr->name.'</a>';                  
                        $html.= $this->childView($arr);
                    }
                    else
                    {
                        $html .='<li class="tree-view" ><a class="tree-name">'.$arr->name.'</a>';                                 
                        $html .="</li>";
                    }                                   
            }            
            $html .="</ul>";
            return $html;
    } 

page.blade.php

@extends ('layouts.master')

@section('title')
Department Management | Admin
@endsection
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jstree/3.2.1/themes/default/style.min.css" />
@section('content')

<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">New department</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
        @if (session('status'))
        <div class="alert alert-success" role="alert">
          {{ session('status') }}
        </div>
        @endif
      </div>
      <form action="/save-department" method="POST">
        {{   csrf_field() }}
        <div class="modal-body">         
          <div class="form-group">
            <label for="recipient-name" class="col-form-label">Name</label>
            <input type="text" class="form-control" name="name" id="recipient-name">
          </div>
          <div class="form-group">
            <label for="recipient-name" class="col-form-label">ID</label>
            <input type="text" class="form-control" name="id" id="recipient-id">// changed from name to id
          </div>          
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
          <button type="submit" class="btn btn-primary">Save</button>
        </div>
      </form>
    </div>
  </div>
</div>
<div class="row">
  <div class="col-md-12">
    <div class="card">
      @if (session('status'))
      <div class="alert alert-success" role="alert">
        {{ session('status') }}
      </div>
      @endif
      <div class="card-header">
        <h4 class="card-title"> Department and Employees </h4>
      </div>
      <div class="card-body">
        <div class="table-responsive">
          <table class="table">
            <thead class=" text-primary">
              </thead>
            </thead>
            <tbody>

<div id="jstree" class="container">      
    {!! $tree !!}
</div>                                                 
            </tbody>           
          </table>  
        </div>
      </div>
    </div>
  </div>

  @endsection
  @section('scripts')

  <!-- 4 include the jQuery library -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.1/jquery.min.js"></script>

  <!-- 5 include the minified jstree source -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jstree/3.2.1/jstree.min.js"></script>

  <script>
  $(function () {
    // 6 create an instance when the DOM is ready
    $('#jstree').jstree();
    // 7 bind to events triggered on the tree
    $('#jstree').on("changed.jstree", function (e, data) {
      console.log(data.selected);
    });
    // 8 interact with the tree - either way is OK
    $('button').on('click', function () {
      $('#jstree').jstree(true).select_node('child_node_1');
      $('#jstree').jstree('select_node', 'child_node_1');
      $.jstree.reference('#jstree').select_node('child_node_1');
    });
  });
  </script>
  @endsection

Answer 1

如果您已经在用户模型中具有“ department（）”关系

User.php

public function department()
{
    return $this->belongsTo(Department::class);
}

然后您可以将该关系用于拥有部门的所有用户
$users = User::whereHas('department')->get();
foreach($users as $user)
{
 // dd($user->username);
}

如果要特定部门的用户，只需使用反向关系
foreach($department->users as $user)
{
 // dd($user->username);
}