<div class="col-xs-12 col-sm-12 col-md-12">
  <div class="form-group">
    <strong>Kelas:</strong>
    {!! Form::select('idkelas', $kelas_theresia, [], array('class' => 'form-control')) !!}
  </div>
</div>

public function edit($id)
    {
        $kamar_theresia = Kamar_Theresia::find($id);
        $kelas_theresia = Kelas_Theresia::pluck('name','id')->all();
        return view('kamar_theresia.edit',compact('kamar_theresia','kelas_theresia'));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  IlluminateHttpRequest  $request
     * @param  AppProduct  $product
     * @return IlluminateHttpResponse
     */

    public function update(Request $request, $id)
    {
         request()->validate([
            'nama' => 'required',
            'idkelas' => 'required',
            'ketersediaan' => 'required',
        ]);

        $input = $request->all();
        $kamar_theresia = Kamar_Theresia::find($id);
        $kamar_theresia->update($input);

        return redirect()->route('kamar_theresia.index')
                        ->with('success','Kamar Theresia updated successfully');
    }