在foreach循环中isset或为空的非法偏移类型

Question

I am trying to update my table row in foreach loop, I have simplified it, but I am geting the same error over and over again.

$zaglavlje = App\Zagljavlje::where('broj_dokumenta','=',$request->zaglavljeId)->first();
$index = 0;

foreach(App\Stavke::where('zaglavlje_id', '=', $zaglavlje->id)->get() as $stavka) {
    $stavkaPromjena = App\Stavke::where('zaglavlje_id','=',$zaglavlje->id)
        ->where('stavka_id','=',$stavka->stavka_id)->first();
    $stavkaPromjena->kolicina = $request->kolicina[$index];
    $stavkaPromjena->save();
    $index++;
}

I have a POST request that gets values from an input tag

<input name="kolicina[]" type="number" max="{{$stavka->kolicina}}" min="1" value="{{ $stavka->kolicina }}">

The foreach loop has the same size as the array from POST I have checked it.

I am geting

"Illegal offset type in isset or empty"

error.

The type in my database of this column is "decimal".

What am I missing here ?

Answer 1

If its any worth, the problem is that laravel/eloquent doesn't know how to handle composite primary keys. The answer to this is here:

Laravel Model with Two Primary Keys update