无法从 DB，Laravel 获取行

Posted 2023-03-14

【中文标题】无法从 DB，Laravel 获取行

【英文标题】：Can't get row from DB, Laravel

【发布时间】：2020-11-21 05:05:37

【问题描述】：

我想将表中的一行的值设置为第二个表和其中的行。我开始用这个制作控制器方法，因为我试图首先从视图中获取值：

public function duplicate(Request $request, Proform $proform)

    var_dump($proform);
    var_dump($proform->id);

    $proform = DB::table('proforms')->where('id', $proform->id)->first();

    var_dump($proform);

我正在从视图和这一行（FIRST）中获取值

 var_dump($proform);

我用 id 得到这个：

object(App\Proform)[1349]
  protected 'fillable' => 
    array (size=24)
      0 => string 'proformnumber' (length=13)
      1 => string 'proformdate' (length=11)
      2 => string 'id' (length=2)
      3 => string 'selldate' (length=8)
      4 => string 'user_id' (length=7)
      5 => string 'paymentmethod' (length=13)
      6 => string 'paymentdate' (length=11)
      7 => string 'status' (length=6)
      8 => string 'comments' (length=8)
      9 => string 'city' (length=4)
      10 => string 'autonumber' (length=10)
      11 => string 'automonth' (length=9)
      12 => string 'autoyear' (length=8)
      13 => string 'name' (length=4)
      14 => string 'PKWIU' (length=5)
      15 => string 'quantity' (length=8)
      16 => string 'unit' (length=4)
      17 => string 'netunit' (length=7)
      18 => string 'nettotal' (length=8)
      19 => string 'VATrate' (length=7)
      20 => string 'grossunit' (length=9)
      21 => string 'grosstotal' (length=10)
      22 => string 'form_id' (length=7)
      23 => string 'currency_id' (length=11)
  public 'sortable' => 
    array (size=13)
      0 => string 'proformnumber' (length=13)
      1 => string 'proformdate' (length=11)
      2 => string 'id' (length=2)
      3 => string 'selldate' (length=8)
      4 => string 'user_id' (length=7)
      5 => string 'paymentmethod' (length=13)
      6 => string 'paymentdate' (length=11)
      7 => string 'status' (length=6)
      8 => string 'comments' (length=8)
      9 => string 'grosstotal' (length=10)
      10 => string 'nettotal' (length=8)
      11 => string 'form_id' (length=7)
      12 => string 'currency_id' (length=11)
  protected 'connection' => null
  protected 'table' => null
  protected 'primaryKey' => string 'id' (length=2)
  protected 'keyType' => string 'int' (length=3)
  public 'incrementing' => boolean true
  protected 'with' => 
    array (size=0)
      empty
  protected 'withCount' => 
    array (size=0)
      empty
  protected 'perPage' => int 15
  public 'exists' => boolean false
  public 'wasRecentlyCreated' => boolean false
  protected 'attributes' => 
    array (size=0)
      empty
  protected 'original' => 
    array (size=0)
      empty
  protected 'changes' => 
    array (size=0)
      empty
  protected 'casts' => 
    array (size=0)
      empty
  protected 'classCastCache' => 
    array (size=0)
      empty
  protected 'dates' => 
    array (size=0)
      empty
  protected 'dateFormat' => null
  protected 'appends' => 
    array (size=0)
      empty
  protected 'dispatchesEvents' => 
    array (size=0)
      empty
  protected 'observables' => 
    array (size=0)
      empty
  protected 'relations' => 
    array (size=0)
      empty
  protected 'touches' => 
    array (size=0)
      empty
  public 'timestamps' => boolean true
  protected 'hidden' => 
    array (size=0)
      empty
  protected 'visible' => 
    array (size=0)
      empty
  protected 'guarded' => 
    array (size=1)
      0 => string '*' (length=1)

但不知道为什么我在这个（第二个）上得到空值

var_dump($proform->id);

然后

$proform = DB::table('proforms')->where('id', $proform->id)->first();

此（第三个）为空

var_dump($proform);



/home/laravel/web/laravel.swt101.eu/public_html/abonamenty/app/Http/Controllers/ProformController.php:33:null
/home/laravel/web/laravel.swt101.eu/public_html/abonamenty/app/Http/Controllers/ProformController.php:37:null

首先，我通过按重复按钮从该视图中获取值：

   @extends('layouts.app')


@section('content')
    <div class="row">
        <div class="col-lg-12 margin-tb">
            <div class="pull-left">
                <h2>Szczegóły abonamentu</h2>
            </div>
            <div class="pull-right">
                <a class="btn btn-primary" href=" route('proforms.index') "> Wstecz</a>
            </div>
        </div>
    </div>


<div class="col-md-4">
<form action="/duplicate" method="get">
<div class="input-group">
<input type="button" value="$proform->id" name="duplicate" class="form-control">
<span class="input-group-prepend">
<button type="submit" class="btn btn-primary">Wystaw fakturę</button>
</span>
</div>
</form>
</div>   



    <div class="row">
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Data wystawienia:</strong>
                 $proform->proformdate 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Kontrahent:</strong>
                 $proform->user_id 
            </div>
        </div>
       <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Data sprzedaży:</strong>
                 $proform->selldate 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Termin płatności:</strong>
                 $proform->paymentdate 
            </div>
        </div>
                <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Forma płatności:</strong>
                 $proform->paymentmethod 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Miejsce wystawienia:</strong>
                 $proform->city 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Status:</strong>
                 $proform->status 
            </div>
        </div>
       <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Uwagi:</strong>
                 $proform->comments 
            </div>
        </div>
            <div class="pull-left" style="margin: 15px;">
                <h3>Pozycje proformy</h3>
            </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Nazwa towaru lub usługi:</strong>
                 $proform->name 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>PKWiU:</strong>
                 $proform->PKWIU 
            </div>
        </div>
       <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Ilość:</strong>
                 $proform->quantity 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Jednostka:</strong>
                 $proform->unit 
            </div>
        </div>
                <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Cena netto jednostki:</strong>
                 $proform->netunit 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Netto razem:</strong>
                 $proform->nettotal 
            </div>
        </div>
       <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Stawka VAT:</strong>
                 $proform->VATrate 
            </div>
        </div>
        <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Brutto jednostka:</strong>
                 $proform->grossunit 
            </div>
        </div>
       <div class="col-xs-12 col-sm-12 col-md-12">
            <div class="form-group">
                <strong>Brutto razem:</strong>
                 $proform->grosstotal 
            </div>
        </div>

    </div>
@endsection
<p class="text-center text-primary"><small>Artplus 2020</small></p>

这是我的路由器：

 ...
    Route::get('/duplicate', 'ProformController@duplicate');
  ...

【问题讨论】：

你能把路线贴在这里吗？

是的，@aimme 是正确的，我假设您没有正确配置路由模型绑定。 route/to/duplicate/proform 如果您尚未自定义路由模型绑定，则 proform 需要是您尝试在路由中解析的模型的 ID。

我编辑了帖子并添加了路线。

那是哪条路线？

Route::get('/duplicate', 'ProformController@duplicate');

【参考方案1】：

您的路由名称应与要注入的模型的模型相匹配。在这种情况下，路由应该有一个proform 参数。在您的情况下，模型未绑定并返回一个空实例。

如果它像@Kurt 所说的那样重复，你的路线应该是这样的

Route::get('/duplicate/proform?', 'ProformController@duplicate');

在这种情况下，它应该是可选的。

但我建议您像下面这样更改它。为重复的帖子创建一个帖子路由，并使用 get 路由显示表单

Route::get('/duplicate/proform', 'ProformController@duplicateForm')->name('proforms.duplicateForm');
Route::post('/duplicate', 'ProformController@duplicatePost')->name('proforms.duplicate');

控制器

public function __construct(Proform $proform)

   $this->proform = $proform;


public function duplicateForm(Request $request, Proform $proform)

    return view('the form view here', ['proform' => $proform]);



public function duplicatePost(Request $request)

    $proform = $this->proform->findOrFail($request->duplicate);

    //something like this
    $duplicated = $this->proform->create($proform->toArray());

    dump($duplicated);

重复表格

<div class="col-md-4">
<form action=" route('proforms.duplicate') " method="POST">
@csrf

<div class="input-group">
<input type="button" value="$proform->id" name="duplicate" class="form-control">
<span class="input-group-prepend">
<button type="submit" class="btn btn-primary">Wystaw fakturę</button>
</span>
</div>
</form>
</div>   

此外，在 Laravel 中，您可以使用以下函数代替 var_dump()

dd() //die and dump, same as var_dump();exit;
dump() //dump,  same as var_dump();

【讨论】：

之后出现错误 404 Route::get('/duplicate/proform', 'ProformController@duplicate');

我已经更新了答案。这是因为您使用的是相同的获取路线，并且正在尝试将其设为可选。

假设您有 proform 模型，使用依赖注入再次更新。

您也遇到了这个问题。现已修复 value="$proform->id"

你可以使用 dd() 和 dump() 代替 var_dump