Question

可以缝找出问题所在是模型没有返回任何数据，我已经检查了控制器，视图，路线，并且一切正常。

    public function edit(TrainingCategory $trainingCategory)
    {
        return view('admin.trainingcategories.edit')->with(['trainingcategory'=>$trainingCategory]);
    }

这是我的控制器方法，$ trainingCategory不会从数据库返回所需的数据。

Route::prefix('admin')->middleware('is_admin')->group(function () {
    Route::get('/dashboard', 'HomeController@adminHome')->name('admin.home');
    Route::resource('positions', 'PositionsController');
    Route::resource('departments', 'DepartmentsController');
    Route::resource('trainings', 'TrainingsController');
    Route::resource('trainingcategories', 'TrainingCategoriesController');
    Route::get('/trainingcategories/{id}/{action}', 'TrainingCategoriesController@changestatus')->name('trainingcategories.status');
});

这是我的路线文件，显示代码

@extends('layouts.admin')
@section('content')
<div class="app-main__inner">
    <div class="app-page-title">
        <div class="page-title-wrapper">
            <div class="page-title-heading">
                <div class="page-title-icon">
                    <i class="pe-7s-user icon-gradient bg-mean-fruit">
                    </i>
                </div>
                <div>Edit Training Category
                    <div class="page-title-subheading">Modify.
                    </div>
                </div> 
            </div>
            <div class="page-title-actions">

                <div class="d-inline-block dropdown">
                    <a href="{{ route('trainingcategories.create') }}" type="button"  class="btn-shadow  btn btn-info">

                        Create New Training Category
                        <span class="btn-icon-wrapper pr-2 opacity-7">

                        </span>
                    </a>
                    <a href="{{ route('trainingcategories.index') }}" type="button"  class="btn-shadow  btn btn-primary">

                        List  Training Categories
                        <span class="btn-icon-wrapper pr-2 opacity-7">
                            <i class="fa fa-arrow-right fa-w-20"></i>
                        </span>
                    </a>

                </div>
            </div>
                </div>
    </div>            
   <!--Data table section-->

   <div class="row">
       <div class="col-md-12">

        <nav class="" aria-label="breadcrumb">
            <ol class="breadcrumb">
                <li class="breadcrumb-item"><a href="{{ route('admin.home') }}">Dashboard</a></li>
            <li class="breadcrumb-item"><a href="{{ route('trainingcategories.index') }}">Training Category</a></li>
                <li class="active breadcrumb-item" aria-current="page">Edit Training Category</li>
            </ol>
        </nav>
           <!--alerts-->
           @if(!empty($errors->all()) )

                          <div class="alert alert-danger fade show" role="alert">
                              @foreach ($errors->all() as $error)
                                      <li>{{ $error }}</li>     
                              @endforeach
                          </div>
            @endif
            <!--end alerts--> 
        <div class="main-card mb-3 card">
        <div class="card-body"><h3 class="h4">Edit Training Category > <b>{{ $trainingcategory->name }}</b><br>
                <small class="muted">Modify</small></h3>
                <hr>
                <form class="needs-validation" novalidate method="POST" action="{{ route('trainingcategories.update',['trainingcategory'=>$trainingcategory->id]) }}">
                    @csrf
                    @method('PUT')
                        <div class="department-relative form-group">
                            <label for="name" class="">Name</label>
                                <input name="name" id="name" placeholder="Enter training category" type="text" class="form-control" 
                                value="{{ old('name',$trainingcategory->name) }}" required>
                                <div class="valid-feedback">
                                    Looks good!
                                </div>
                                <div class="invalid-feedback">
                                    Please enter training category.
                                </div>
                            </div>
                        <div class="department-relative form-group">
                            <label for="description" class="">Active<i class="muted"></i></label>
                            @include('includes._active_select')
                            </div>
                        <div class="department-relative form-group">
                            <label for="description" class="">Training Description<i class="muted">(Optional)</i></label>
                            <textarea name="description" id="description" class="form-control" required> {{ old('description',$trainingcategory->description) }} </textarea>
                            <div class="valid-feedback">
                                Looks good!
                            </div>
                            <div class="invalid-feedback">
                                Please enter training description.
                            </div>
                        </div>
                        <button class="mt-1 btn btn-primary">update</button>
                    </form>
                </div>

        </div>
</div>
</div>
     <!-- form validation-->
<script>
// Example starter JavaScript for disabling form submissions if there are invalid fields
(function() {
'use strict';
window.addEventListener('load', function() {
// Fetch all the forms we want to apply custom Bootstrap validation styles to
var forms = document.getElementsByClassName('needs-validation');
// Loop over them and prevent submission
var validation = Array.prototype.filter.call(forms, function(form) {
form.addEventListener('submit', function(event) {
    if (form.checkValidity() === false) {
        event.preventDefault();
        event.stopPropagation();
    }
    form.classList.add('was-validated');
}, false);
});
}, false);
})();
</script>
   <!--end data table section-->


</div>

@endsection

这是我的观点

Answer 1

伙计们，我终于找到了答案，方法是将变量名称trainingCategory更改为$ trainingcategory（请注意小写字母'c'，与资源路由命名匹配）。因此，资源从数据库返回数据。

Laravel自动解析在变量名称与路由段名称匹配的路由或控制器操作中定义的类型提示模型。

Answer 2

该错误与[Route：trainingcategories.update]有关。完成时：

Route::resource('trainingcategories','TrainingCategoriesController');

您生成此路线：Trainingcategories.update，它在TrainingCategoriesController的更新方法中正在等待$ trainingcategories参数。

像这样：

public function update(TrainingCategory $trainingCategory)

因此，您需要查看更新方法。编辑方法无罪。

Answer 3

您已经证明这是生成路线的方式：

route('trainingcategories.update',['trainingcategory'=>$trainingcategory->id])

您不需要传入关联数组，可以传入模型。

route('trainingcategories.update', $trainingcategory)

确保$traningcategory实际上存在，并且ID属性不为null。 Laravel抱怨它没有得到必需的参数。

Facade \ Ignition \ Exceptions \ ViewException缺少[Route：trainingcategories.update]的必需参数

3 个答案: