获取要在另一个表

Question

在laravel 5.1中，它给出了错误UNDEFINED INDEX :: cost_group

我想在其他付款视图页面中显示课程表的列名，并在选择其中一个时将其存储到另一个表（付款）中

我的PaymentsController.php：

public function index(Request $request) {
        $filter = $request->input();
        $sort = $request->query();
        $payments = Payment::filter($filter)->sort($sort)->paginate(10);

        foreach(Course::all() as $course) {
            $data['courses'][$course->id] = $course->name;
            $data['courses'][$course->cost_group]=$course->course_cost;
            $data['courses'][$course->cost_minigroup]=$course->course_name;
            $data['courses'][$course->cost_individual]=$course->course_name;

        }

        return view('payments.index', compact('payments', 'data'));
    }

我的form.blade.php（付款）

<div class="ui form">
             <div class="field">
                 <div class="ui selection dropdown">
                     <input type="hidden" name="amount" id="course_val" />
                     <i class="dropdown icon"></i>
                     <div class="default text">Course type</div>
                     <div class="menu">
                         <div class="item course_val" data-value="{{$data['cost_group']}}">Group</div>
                         <div class="item course_val" data-value="{{$data['cost_minigroup']}}">Minigroup</div>
                         <div class="item course_val" data-value="{{$data['cost_individual']}}">Individual</div>
                     </div>
                 </div>
             </div>
         </div>