investbrain/app/Imports/Sheets/PortfoliosSheet.php

<?php

namespace App\Imports\Sheets;

use App\Models\Portfolio;
use Illuminate\Support\Collection;
use Maatwebsite\Excel\Concerns\ToCollection;
use Maatwebsite\Excel\Concerns\SkipsEmptyRows;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Maatwebsite\Excel\Concerns\WithValidation;

class PortfoliosSheet implements ToCollection, WithValidation, WithHeadingRow, SkipsEmptyRows
{
    public function collection(Collection $portfolios)
    {
        foreach ($portfolios as $portfolio) {
            
            Portfolio::unguard();

            Portfolio::updateOrCreate([
                'id' => $portfolio['portfolio_id']
            ], [
                'id' => $portfolio['portfolio_id'] ?? null,
                'title' => $portfolio['title'],
                'wishlist' => $portfolio['wishlist'] ?? false,
                'notes' => $portfolio['notes'],
            ]);
        }
    }

    public function rules(): array
    {
        return [
            'portfolio_id' => ['sometimes', 'nullable'],
            'title' => ['required', 'string'],
            'wishlist' => ['sometimes', 'nullable', 'boolean'],
            'notes' => ['sometimes', 'nullable', 'string'],
        ];
    }
}