未定义偏移量：1个laravel 6

如何解决未定义偏移量：1个laravel 6

我想更新多级选择项上类别的数据，但是我有一个问题，我可以在不选择父项的情况下编辑类别，但是当我选择父项时我不能编辑类别。然后显示一个错误，称为未定义的偏移量：1，这里是跟踪错误

Illuminate\Foundation\Bootstrap\HandleExceptions::handleError
   
C:\laragon\www\oesingcoffee\vendor\laravel\framework\src\Illuminate\Validation\Concerns\ValidatesAttributes.php:874

这是在laravel框架中验证attrib

protected function getExtraConditions(array $segments)
{
$extra = [];
$count = count($segments);
for ($i = 0; $i < $count; $i += 2) {
$extra[$segments[$i]] = $segments[$i + 1];  //this is the 874 line
}
return $extra;
}

这是CategoryRequest类

class CategoryRequest extends FormRequest
{
public function authorize()
{
    return true;
}

public function rules()
{
    $parentId = (int) $this->get('parent_id');
    $id = (int) $this->get('id');

    if($this->method() == 'PUT'){
        if($parentId > 0){
            $name = 'required|unique:categories,name,'.$id.'id,parent_id,'.$parentId;         
        }else{
            $name = 'required|unique:categories,'.$id;
        }

        $slug = 'unique:categories,slug,'.$id;

    }else{
        $name = 'required|unique:categories,NULL,id,'.$parentId;
        $slug = 'unique:categories,slug';
    }  

    return [
        'name' => $name,'slug' => $slug,];
}
}

这是我用来更新数据的控制器

public function update(CategoryRequest $request,$id)
{
    $params = $request->except('_token');
    $params['slug'] = Str::slug($params['name']);
    $params['parent_id'] = (int)$params['parent_id'];

    $category = Category::findOrFail($id);
    if ($category->update($params)) {
        Session::flash('success','Category has been updated.');      
    }

    return redirect('admin/categories');   
}

此视图表单

@extends('admin.layout')

@section('content')

@php
   $formTitle = !empty($category) ? 'Update' : 'New'    
@endphp

<div class="content">
<div class="row">
    <div class="col-lg-6">
        <div class="card card-default">
            <div class="card-header card-header-border-bottom">
                    <h2>{{ $formTitle }} Category</h2>
            </div>
            <div class="card-body">
                @include('admin.partials.flash',['$errors' => $errors])
                @if (!empty($category))
                    {!! Form::model($category,['url' => ['admin/categories',$category->id],'method' => 'PUT']) !!}
                    {!! Form::hidden('id') !!}
                @else
                    {!! Form::open(['url' => 'admin/categories']) !!}
                @endif
                    <div class="form-group">
                        {!! Form::label('name','Name') !!}
                        {!! Form::text('name',null,['class' => 'form-control','placeholder' => 'category name']) !!}
                    </div>
                    <div class="form-group">
                        {!! Form::label('parent_id','Parent') !!}
                        {!! General::selectMultiLevel('parent_id',$categories,'selected' => !empty(old('parent_id')) ? old('parent_id') : !empty($category['parent_id']) ? $category['parent_id'] : '','placeholder' => '-- Choose Category --']) !!}
                    </div>
                    <div class="form-footer pt-5 border-top">
                        <button type="submit" class="btn btn-primary btn-default">Save</button>
                        <a href="{{ url('admin/categories') }}" class="btn btn-secondary btn-default">Back</a>
                    </div>
                {!! Form::close() !!}
            </div>
        </div>  
    </div>
</div>

@endSection

这是迁移

public function up()
{
    Schema::create('categories',function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('name');
        $table->string('slug');
        $table->bigInteger('parent_id');
        $table->timestamps();
    });
}

这是控制器中的编辑方法

public function edit($id)
{
    $category = Category::findOrFail($id);
    $categories = Category::orderBy('name','asc')->get();

    $this->data['categories'] = $categories->toArray();
    $this->data['category'] = $category;
    return view('admin.categories.form',$this->data);
}

解决方法

您应该尝试save（）方法。

public function update(CategoryRequest $request,$id)
{
    $params = $request->except('_token');
    $params['slug'] = Str::slug($params['name']);
    $params['parent_id'] = (int)$params['parent_id'];

    $category = Category::findOrFail($id);
    if ($category->save()) {
        Session::flash('success','Category has been updated.');      
    }

    return redirect('admin/categories');   
}

替换上面的一个。

,

public function update(CategoryRequest $request,$id)
{
    $params = $request->except('_token');
    $category = Category::findOrFail($id);
    $category->slug = Str::slug($params['name']);
    $category->parent_id = (int)$params['parent_id'];
    $category->save();
    Session::flash('success','Category has been updated.');

    return redirect('admin/categories');   
}

,

我认为您的问题不是您的验证规则（特别是您的唯一规则）。我可以提出其他建议吗？

我现在没有测试环境，所以现在可能需要做一些调整。

use Illuminate\Validation\Rule;

...

public function rules()
{
    $name = [
        'required',Rule::unique('categories')->where(function ($query) {
            return $query->where('name',$this->name)
                         ->where('parent_id',$this->parent_id);
        })->ignore($this->id,'id'),];

    $slug = [
        Rule::unique('categories','slug')->ignore($this->id,];

    return [
        'name' => $name,'slug' => $slug,];
}