php - undefined variable : tasks (0) when trying to output every database(Tasks) entry associated to one main database entry (Projects)

Question

我是 Laravel 新手，并尝试输出相关的每个任务 对于一个项目，当我注释掉该部分时一切正常 关于任务。

The problematic part of the view(show.blade.php):
<div>
  @foreach($project->$tasks as $task)
      <li>{{$task->description}}</li>
  @endforeach
</div>

当我进入 php artisantinker 时，一切都显示得很好

>>> App\Project::first()->tasks;
=> Illuminate\Database\Eloquent\Collection {#892
 all: [
   App\Task {#3200
     id: 1,
     project_id: 1,
     description: "Buy a map",
     completed: 0,
     created_at: null,
     updated_at: null,
   },
   App\Task {#3201
     id: 2,
     project_id: 1,
     description: "Inform friends",
     completed: 1,
     created_at: null,
     updated_at: null,
   },
 ],
}


The exact error message i get when trying to load the view:

ErrorException (E_ERROR)
Undefined variable: tasks 

Answer 1

您似乎没有将 $task 变量推送到您的 View 中。从你的 Controller 你可以做这样的事情:

public function Showtask()
{
 $data['project']=DB::table('your-table')->get();

 return view('show',$data);

}

你的看法

<div>
  @foreach($project as $task)
      <li>{{$task->description}}</li>
  @endforeach
</div>