/**
  * Update the specified resource in storage.
  *
  * @param  Request  $request
  * @param  int  $id
  * @return Response
  */
 public function update(Request $request, $id)
 {
     $c = Chat::findOrNew($id);
     $input = $request->all();
     $c->fill($input)->save();
     return ["success" => true];
 }