Laravel one-to-many relationship how to access?

Question

Laravel

class department extends Model
{
    public function User()
    {
        return $this->hasMany('App\User','departments_id','id');
    }
}

class UserAll extends Model
{
    protected $table = 'users';
    protected $guarded = [];

    public function department()
    {
        return $this->belongsTo('App\Department','departments_id','id');
    }

}

public function up()
    {
        Schema::create('departments', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('names');
            $table->string('description');
            $table->string('logo');
            $table->bigInteger('departments_id')->unsigned()->index();
            $table->foreign('departments_id')
                ->references('id')->on('users');
            $table->timestamps();
        });
    }

public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }

class DepartmertController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $comments = \App\Department::all();
        $departmens=$comments->User();
        dd($departmens);
        return view('department.index',compact('departmen','user'));
    }

how can I get the username that belongs to the link using the department I have already tried a lot of things everywhere errors the connection goes by the key foreign I want to pull out the object of the communication department to pull out the username that is associated with this department, the dock did not help

Answer 1

in Department

public function users() {
  return $this->belongsToMany('App\User', 'user_department', 'departament_id', 'user_id');
}

in controller

$departaments = Department::with('users')
                          ->get();

in template

@foreach ($departaments as $departament)
  @foreach ($departament->users as $user)
    {{$user->name}}
  @endforeach
@endforeach

ManyToMany

Answer 2

You should listen to what you are told. And about the question $ comments is a collection and not a model instance, this is an error