Insert Multiple table ke Database Menggunakan Ajax pada laravel

Screenshot_33.png21.14 KBini adalah data yang berhasil saya dapatkan. ini menggunakan seralizeArray.

 $('#form_field').submit(function(e) {
         e.preventDefault()
         const serialize = $(this).serializeArray();
         const table_item = document.querySelectorAll('#tabel_item_stock_entry tbody');
         let array_item_quotation = [];
         const el = $("#tabel_item_stock_entry tbody").find("tr");
         for (let i = 0; i < el.length; i++) {
               const els = $(`#tabel_item_stock_entry tbody tr:eq(${i})`);
               const item_name = els.find(".item_name").text();
               const qty = els.find(".qty").val();
               const rate = els.find(".rate").val();
               const amount = els.find(".amount").val();
               // const _token = els.find('meta[name="csrf-token"]').attr('content');
               array_item_quotation.push({
                  item_name: item_name,
                  qty: qty,
                  rate: rate,
                  amount: amount
               });
               $.ajaxSetup({
                  headers: {
                     'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
                  }
               });
               $.ajax({
                  url: "/quotation-list",
                  type:"POST",
                  data:{
                     item_name:item_name,
                     qty:qty,
                     rate:rate,
                     amount:amount,
                     body:serialize
                  },
                  success:function(response){
                     // if(response.success){
                     //       alert(response.message) //Message come from controller
                     // }else{
                     //       alert("Error")
                     // }
                  },
                  error:function(error){
                     // console.log(error)
                  }
               });
         }
         console.log( $(this).serializeArray(), array_item_quotation );
      });

ini script jquery yang saya buat

public function store(Request $request)
    {
        $data = $request->all();
        $objects = json_decode(json_encode($data));

        $objects = new Quotation();
        $objects->series = $request->series;
        $objects->customer = $request->customer;
        $objects->posting_date = $request->posting_date;
        $objects->grand_total_amount = $request->grand_total_amount;
        $objects->total_qty = $request->total_qty;
        $objects->grand_total = $request->grand_total;
        $objects->save();

        $data2 = DB::table('quotation_items')->insert([
            'quotation_id' => $objects->id,
            'item_name' => $request->input('item_name'),
            'qty' => $request->input('qty'),
            'rate' => $request->input('rate'),
            'amount' => $request->input('amount'),
            'created_at' => Carbon::now(),
            'updated_at' => Carbon::now()
        ]);

        return response()->json(['success'=>'Ajax request submitted successfully']);
    }

ini Controller yang saya buat, dan selalu menampilkan eror seperti ini "SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'series' cannot be null (SQL: insert into `quotations` (`series`, `customer`, `posting_date`, `grand_total_amount`, `total_qty`, `grand_total`, `updated_at`, `created_at`) values (?, ?, ?, ?, ?, ?, 2021-07-11 09:23:29, 2021-07-11 09:23:29))",

" Isi value selalu kosong, Boleh minta solusi?