Book Update

gistfile1.txt

 public function update(Request $request, string $isbn) : JsonResponse
{

   DB::beginTransaction();
   try {
       $book = Book::with(['authors', 'images', 'user'])
           ->where('isbn', $isbn)->first();
       if ($book != null) {
           $request = $this->parseRequest($request);
           $book->update($request->all());

           //delete all old images
           $book->images()->delete();
           // save images
           if (isset($request['images']) && is_array($request['images'])) {
               foreach ($request['images'] as $img) {
                   $image = Image::firstOrNew(['url'=>$img['url'],'title'=>$img['title']]);
                   $book->images()->save($image);
               }
           }
           //update authors

           $ids = [];
           if (isset($request['authors']) && is_array($request['authors'])) {
               foreach ($request['authors'] as $auth) {
                   array_push($ids,$auth['id']);
               }
           }
           $book->authors()->sync($ids);
           $book->save();

       }
       DB::commit();
       $book1 = Book::with(['authors', 'images', 'user'])
           ->where('isbn', $isbn)->first();
       // return a vaild http response
       return response()->json($book1, 201);
   }
   catch (\Exception $e) {
       // rollback all queries
       DB::rollBack();
       return response()->json("updating book failed: " . $e->getMessage(), 420);
   
}