/**
  * Store a newly created resource in storage.
  *
  * @param  \Illuminate\Http\Request  $request
  * @return \Illuminate\Http\Response
  */
 public function store(Request $request)
 {
     $this->validate($request, ['customer_name' => 'required|max:255', 'group_list_selected' => 'required']);
     $customer = new Customer(['name' => $request->customer_name]);
     $customer->save();
     // Add the new group - customer association
     foreach ($request->group_list_selected as $g_selected) {
         $customer->groups()->attach($g_selected);
     }
     return redirect('/customers');
 }