It doesn't look like you have the associations setup properly. Instead of your current method, you should build an array where you have ['checkedID'=>'number'] and then just do a foreach loop to update the rows:

foreach ($arr as $id => $number) Products::where('id',$id)->update(['number'=>$number])

jeremybalog said:

It doesn't look like you have the associations setup properly. Instead of your current method, you should build an array where you have ['checkedID'=>'number'] and then just do a foreach loop to update the rows:

foreach ($arr as $id => $number) Products::where('id',$id)->update(['number'=>$number])

Thanks a lot, this has worked for me in the end after playing around with the arrays!