Hi. how can i input mutliple data from form into database using laravel 5.3

my code for form is below:

                $trans_id = DB::table('sales')->max('trans_id');
                $member_id = DB::table('sales')->where('trans_id','=', $trans_id)->value('member_id');
                $name = DB::table('members')->where('member_id','=', $member_id)->value('name');
                //$trans_id = DB::table('sales')->where('member_id','=', 'member_id')->value('member_id');
                //$user = DB::table('users')->where('name', 'John')->first();
                //int trans_id=$trans_i;
                echo " ".$name;

           ?><p>

          <form method="POST" action="/sales">
            {{ csrf_field()}}

            <input type="hidden" name='trans_id' value="<?php echo $trans_id;?>">
            <!-- trans_id is not going to be inputed from form -->
            <div class="form-group">
              <label for="content">Product code</label>
              <input type="text" name='product_code' class="form_control">
            </div>

            <div class="form-group">
              <label for="content">Quantity </label>
              <input type="text" name='quantity' class="form_control">
            </div>

            <div class="form-group">
              <label for="content">Product code</label>
              <input type="text" name='product_code' class="form_control">
            </div>

            <div class="form-group">
              <label for="content">Quantity </label>
              <input type="text" name='quantity' class="form_control">
            </div>

            <input type="submit" class="btn btn-succes pull-right" >
          </form>

then the Model is called Sales, given below

namespace App;

use Illuminate\Database\Eloquent\Model;

class Sale extends Model
{



    protected $table = "transactions"; // If table name is sales then u don't need to write anythink to link to table if the Model name is Sale
    protected $fillable = ['trans_id','product_code','quantity'];
}

the contoller is below

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Sale;
use Auth;

class SalesController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
      //  $trans_id = DB::table('sales')->where('name', 'John')->value('email');
      //$trans_id = DB::table('users')->where('member_id', '4')->value('trans_id');
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('sales.create');
    }



    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        /*$sale = new Sale; // create new sale instance and set attributes of model
        $sale->product_code = $request->product_code;
        $sale->quantity = $request->quantity;

        $sale->save();*/
        Sale::create($request->all());
        return redirect('/authsales/create');
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        //
    }
}

im failing to input all value in the 2 rows of data base, its only inputing the last value