尝试显示包含 Laravel 集体形式的视图 (edit.blade.php) 时，给出 'Invalid argument supplied for foreach()' - Laravel

Question

单击 show.blade.php 中的编辑按钮时，它应该显示 edit.blade.php，但显示 'Invalid argument supplied for foreach()'

其他一切正常... 知道我做错了什么吗？

整个错误消息： ErrorException 为 foreach() 提供的参数无效（视图：Real-estate/resources/views/properties/edit.blade.php）（127.0.0.1:8000/properties/8/edit）

foreach 循环 (in: vendor/laravelcollective/html/src/FormBuilder.php:656)

foreach ($list as $value => $display) {

     $optionAttributes = $optionsAttributes[$value] ?? [];

     $optgroupAttributes = $optgroupsAttributes[$value] ?? [];

     $html[] = $this->getSelectOption($display, $value, $selected, $optionAttributes, $optgroupAttributes);
}

观看次数

show.blade.php

<a href="/properties/{{ $property->id }}/edit" class="btn btn-light">Edit</a>

edit.blade.php

{!! Form::open(['action' => ['PropertiesController@update', $property->id], 'method' => 'POST', 'enctype' => 'multipart/form-data']) !!}  
        // a bunch of <div class="form-group"></div> go here
        {{ Form::hidden('_method', 'PUT') }}
        {{ Form::submit('Done', ['class' => 'btn btn-primary']) }}
 {!! Form::close() !!}

创建。blade.php

{!! Form::open(['action' => 'PropertiesController@store', 'method' => 'POST', 'enctype' => 'multipart/form-data']) !!}
       // a bunch of <div class="form-group"></div> go here
       {{ Form::submit('Publish', ['class' => 'btn btn-primary']) }} 
{!! Form::close() !!}

控制器

public function store(Request $request)
{
    $property = new Property;
    $property->title = $request->input('title');
    .
    .
    .
    $property->save();
    return redirect('/home');
}

public function update(Request $request, $id)
{
    $property = Property::find($id);
    $property->title = $request->input('title');
    .
    .
    .
    $property->save();
    return redirect('/home');
}

dd($属性) 在 $属性->save() 之前；在上面的 public 函数 store() 中

App\Property {#1204 ▼
  #table: "properties"
  +primaryKey: "id"
  #connection: null
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  #perPage: 15
  +exists: false
  +wasRecentlyCreated: false
  #attributes: array:10 [▼
    "title" => "Nice House"
    "reference_no" => "1234"
    "published_date" => "2021-06-04"
    "price" => "400k"
    "property_type" => "example"
    "area" => "example"
    "city" => "Example city"
    "description" => "example"
    "images" => "noimage.jpg"
    "user_id" => 2
  ]
  #original: []
  #changes: []
  #casts: []
  #dates: []
  #dateFormat: null
  #appends: []
  #dispatchesEvents: []
  #observables: []
  #relations: []
  #touches: []
  +timestamps: true
  #hidden: []
  #visible: []
  #fillable: []
  #guarded: array:1 [▼
    0 => "*"
  ]
}

Answer 1

你能检查一下 $list 的值是多少吗？

编辑：

$list returns 一个字符串。

foreach($array as $key=>$value) {
    // Do stuff
}

当使用上面的例子时，$array是foreach使用的数组，$key是每个数组项的键名，$value是它对应的值。

在你的情况下，这是：

foreach ($list as $value => $display) {
    ...
}

当您尝试获取数组的键 ($value) 和值 ($display) 时，它收到为提供的 无效参数foreach().

Answer 2

好的，那么问题就解决了。该错误是由错误配置的表单字段引起的：{{ Form::select }} in create.blade.php。我漏了null，所以应该是： {{ Form::select('city', ['Example City 1' => 'Example City 1', 'Example City 2' => 'Example City 2' ], null, ['placeholder' => 'Select city...']) }}

尝试显示包含 Laravel 集体形式的视图 (edit.blade.php) 时，给出 'Invalid argument supplied for foreach()' - Laravel

When trying to show a view (edit.blade.php) containing a Laravel Collective form, gives 'Invalid argument supplied for foreach()' - Laravel

laravel

laravelcollective