未定义的变量：编辑中的类别 blade

Question

我的控制器里有这个，但我的 edit.blade

中一直出现以下错误

错误异常未定义的变量：类别（视图：

命名空间App\Http\Controllers；

使用App\Models\Category；使用 Illuminate\Http\Request;

class 类别控制器扩展控制器 { /** * 显示资源列表。 * * @return \Illuminate\Http\Response * */ public 函数 __construct() {

}

public function index()
{
    $categories = category::all();
    return view('category.index', [$categories = 'category']);
}

/**
 * Show the form for creating a new resource.
 *
 * @return \Illuminate\Http\Response
 */
public function create()
{
    return view('category.create');
}

/**
 * Store a newly created resource in storage.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return \Illuminate\Http\Response
 */
public function store(Request $request)
{
    
    $this->validate($request, [
        'name' => 'required'
    ]);

    Category::create($request->all());
  

    return redirect()->back()->with('success', 'Category Successfully Created');
}

/**
 * Display the specified resource.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function show($id)
{
    //
}

/**
 * Show the form for editing the specified resource.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function edit($id)
{
    $category=category::find($id);
    return view('category.edit', [$categories = 'category']);
}

/**
 * Update the specified resource in storage.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function update(Request $request, $id)
{
    $this->validate($request, [
        'name' => 'required',
    ]);
        
    $category=category::find($id);  
    $category->update();

    return redirect()->route('category.index')
                    ->with('success','Category updated successfully');
}

/**
 * Remove the specified resource from storage.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function destroy($id)
{
    //
}

}

这是我的edit.blade

<input type="text" name="name"  id="name" class="form-control @error('name') is-invalid @enderror" value="{{$category->name}}" placeholder="Category Name">

Answer 1

像这样修复你的功能。我假设你的模型都是小写的

public function index()
{
    $categories = category::all();
    return view('category.index', ['categories' => $categories]);
}

public function edit($id) 
{
    $category=category::find($id);
    return view('category.edit', ['category' => $category]); 
}

类别字符串是 blade 文件中的变量， $categories 是来自控制器的变量

这是您的索引 blade 文件中的示例

@foreach ($categories as $category)
    <input type="text" name="name"  id="name" class="form-control @error('name') is-invalid @enderror" value="{{ $category->name }}" placeholder="Category Name">
@endforeach

这是用于编辑 blade 文件

<input type="text" name="name"  id="name" class="form-control @error('name') is-invalid @enderror" value="{{ $category->name }}" placeholder="Category Name">

未定义的变量：编辑中的类别 blade

Undefined variable: category in edit blade

php

laravel

controller

laravel-blade

edit