Call to a Member Function fill() on Null Laravel

Question

I've been trying to edit a record. My code will create a new record if the data is null. However, I get the following error:

Call to a member function fill() on null.

I'm not sure what I did wrong; maybe I didn't declare?

Controller

<?php

public function auctionUpdate(Request $request, MediaSite $mediaSite)
{
    $auction = $mediaSite->auction;

    DB::transaction(function() use ($request, $mediaSite, $auction){
        $auction->fill($request->only([
           'status', 'start_time', 'end_time', 'period_start_date'
        ]));

        if($auction == null)
            $auction = new Auction();

        $auction->save();
   });

   return view('admin.media-site.show', [
       'mediaSite' => $mediaSite,
       'auction' => $auction
   ]);
}

Answer 1

You should check if auction is null before fill()

your modified script

public function auctionUpdate(Request $request, MediaSite $mediaSite)
{
    $auction = $mediaSite->auction;

    DB::transaction(function() use ($request, $mediaSite, $auction){
        if($auction == null)
            $auction = new Auction();

        $auction->fill($request->only([
           'status', 'start_time', 'end_time', 'period_start_date'
        ]));

        $auction->save();
   });



   return view('admin.media-site.show', [
       'mediaSite' => $mediaSite,
       'auction' => $auction
   ]);
}