Question

我在laravel上使用leftJoin，但是出现错误

未定义属性：Illuminate \ Database \ Eloquent \ Collection :: $ id

这里是Controller上的示例代码

$news = News::find($id)
            ->leftJoin('categories', 'news.category_id', '=', 'categories.id')
            ->get();

    //dd($news);

    return view('news.update')
    ->with('news', $news);

我一直在尝试使用get（） - ＆gt; first（）但它只显示第一条记录。如果我像这样在刀片上使用foreach，那么错误就是一样的

<form class="form-horizontal" action="/news/{{$news->id}}" method="post" enctype="mulipart/form-data">
<select name="category_id">
    <option> - </option>
    @foreach($news as $news)
    <option value="{{ $news->category_id }}" selected>{{ $news->category }}</option>
    @endforeach 
</select> </form>

Answer 1

尝试这样做

$news = DB::table('news')
          ->leftJoin('categories', 'categories.id', '=', 'news.category_id')
          ->select('news.*', 'categories.*')
          ->get();

- ＆gt; select（'news。'，'categories。'）//从新闻和类别中选择所有记录

<form class="form-horizontal" action="/news/{{$news[0]->id}}" method="post" enctype="mulipart/form-data">
  <select name="category_id">
      <option> - </option>
      @foreach($news as $news_data)
        <option value="{{ $news_data->category_id }}" selected>{{ $news_data->category }}</option>
      @endforeach 
  </select> 
</form>

Laravel Error leftJoin：Undefined属性：Illuminate \ Database \ Eloquent \ Collection :: $ id

1 个答案: