Laravel 7多对多关系不起作用

Question

一个事件可以在一到几年内发生，一年可以有几个事件，因此使用了多对多关系。

所以我有三个表：evenements、years和evenement_year(透视表(。

我仔细阅读了Laravel 7文档，并认为我遵循了程序：

均匀度模型：

<?php
namespace App;
use IlluminateDatabaseEloquentModel;
class Evenement extends Model
{
protected $fillable = ['name', 'year_id','mnemonique','color'];
//One yar can have severals events and I give the name events_years to pivot
public function years()
{
return $this->belongsToMany(Year::class, 'evenement_year'); 
}
}

年份型号：

<?php
namespace App;
use IlluminateDatabaseEloquentModel;
class Year extends Model
{
protected $fillable = ['name'];
public function evenements()
{
// a event can be in several years and I give the name events_years to pivot
return $this->belongsToMany(Evenemnt::class, 'evenement_year');

}
}

当我尝试用以下代码(在EventmentController中(在索引方法中选择所有带有年份的事件时：

<?php
namespace AppHttpControllers;
use AppEvenement;
use AppEvenementType;
use AppType;
use AppYear;
use IlluminateHttpRequest;
use IlluminateSupportFacadesDB;
use stdClass;
class EvenementController extends Controller
{
/**
* Create a new controller instance.
*
* @return void
*/
public function __construct()
{
$this->middleware('auth');
}
/**
* Display a listing of the resource.
*
* @return IlluminateHttpResponse
*/
public function index()
{
$evenements = Evenement::orderBy('year_id')->orderBy('mnemonique')->get();
$years = Year::all();
$evenTypes= EvenementType::all();
$types= Type::All();

return view('evenement.index', compact('evenements', 'years','evenTypes','types'));
}

}

我有这个错误：

SQLSTATE[42S22]：未找到列：1054中的未知列"year_id"order子句"(SQL：按year_id从evenements顺序中选择*asc、mnemoniqueasc(

感谢您的帮助，祝您周日愉快。

编辑：

这是视图代码：

@extends('adminlte::page')
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/spectrum-colorpicker2/dist/spectrum.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/spectrum-colorpicker2/dist/spectrum.min.css">
@section('title', 'Cours')
@section('content_header')
<h1>Liste des évènements</h1>
@stop
@section('content')
<p>La liste de tous les évènements enregistrer</p>
<div class="card">
<div class="card-header">
<a href="{{ route('evenement.create') }}" class="btn btn-sm btn-primary">Ajouter un événement</a>

</div>
<div class="filtre">
<p margin:50>Selectionner une année <br>
<SELECT name="filtreAnnée" margin: 50>
<libellé>Selectionner une année</libellé>
<option valeur="tout">Toutes les années</option>
<option valeur="BA1">BA1</option>
<option valeur="BA2">BA2</option>
<option valeur="BA3">BA3</option>
<option valeur="MA1">MA1</option>
<option valeur="MA2">MA2</option>
</SELECT>
</div>
<div class="card-body">
<div class="table-responsive">
<table class="table table-hover">
<thead>
<tr>
<th>Mnémonique</th>
<th>Nom</th>
<th>Année</th>
<th>Couleur</th>
<th>Action</th>
</tr>
</thead>
<tbody>
@foreach ($evenements as $evenement)
<tr style="outline: thin solid">
<td>{{ $evenement->mnemonique }}</td>
<td>{{ $evenement->name }}</td>
<td>{{ $evenement->year->name }}</td>
<td>{{ $evenement->color}}</td>
<td>
<button type="button" class="btn btn-sm btn-warning" id="edit" data-toggle="modal" data-target="#edit-modal-{{ $evenement->id }}">
<i class="far fa-edit"></i>
</button>
@include('evenement.update')
<button type="button" class="btn btn-sm btn-danger" data-toggle="modal" data-target="#delete-modal-{{ $evenement->id }}">
<i class="far fa-trash-alt"></i>
</button>
@include('evenement.delete')
</td>
</tr>
<?php $displayTh = false ?>
@foreach ($evenTypes as $evenT)
@if (!$displayTh)
<?php $displayTh=true ?>
<tr>
<th>              </th>
<th>Type de cours </th>
<th>Nombre d'heure</th>
<th>
<button  type="button" class= "btn btn-sm btn-primary" data-toggle="modal" data-target="#create-type-modal-{{ $evenement->id }}">
<i class="fa fa-plus-circle" aria-hidden="true"></i>
</button>
@include('evenement.createEvenementType')
</th>
</tr>
@endif
@if ($evenement->id == $evenT->evenement_id )
<tr>
<td>      </td>
<td>{{$evenT->type->name}}</td>
<td>{{$evenT->total_hours}}</td>
<td><button type="button" class="btn btn-sm btn-danger" data-toggle="modal" data-target="#delete-type-modal-{{ $evenT->id }}">
<i class="fas fa-minus-circle"></i>
</button>
@include('evenement.deleteEvenementType')
</td>
</tr>
@endif
@endforeach

<tr></tr>
@endforeach
<script>
$(".basic").spectrum();
</script><!-- palette de couleur-->
</tbody>
</table>
</div>
</div>
</div>
@stop
@section('css')
@stop
@section('js')
@stop

编辑2(添加到阵列(

例如，我需要array62中的name和array5中的name。

array:62 [▼   

0=>数组：7[▼

"id" => 61
"name" => "Accueil"
"mnemonique" => "Accueil"
"color" => "#bcbcbc"
"created_at" => "2021-07-13T14:16:04.000000Z"
"updated_at" => null
"years" => array:2 [▼
0 => array:5 [▼
"id" => 1
"name" => "BA1"
"created_at" => "2021-07-13T14:16:04.000000Z"
"updated_at" => null
"pivot" => array:2 [▶]
]
1 => array:5 [▼
"id" => 4
"name" => "MA1"
"created_at" => "2021-07-13T14:16:04.000000Z"
"updated_at" => null
"pivot" => array:2 [▶]
]
]   ]

Answer 1

使用with，我们可以通过相关数据进行订购

对于升序

$evenements = Evenement::with(['years'=>function ($query){
$query->orderBy('year_id');
}])->get();

对于降序

$evenements = Evenement::with(['years'=>function ($query){
$query->orderByDesc('year_id');
}])->get();

用于检索那些具有年的Evement

$evenements = Evenement::with(['years'=>function ($query){
$query->orderByDesc('year_id');
}])->has('years')->get();

要获取相关的表列，如果它在刀片文件中，则

@foeach($evenements as $event)

@if(isset($event->years)&&count((array)$event->years))
@foreach($event->years as $year)
{{$year->name??null}}
@endforeach
@endif

@endforeach