<?php

namespace App\Nova\Actions;

use App\Models\Crop;
use App\Models\Flyer;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Support\Collection;
use Laravel\Nova\Actions\Action;
use Laravel\Nova\Fields\ActionFields;
use Laravel\Nova\Fields\MultiSelect;
use Laravel\Nova\Http\Requests\NovaRequest;

class AttachFlyerToCrop extends Action
{
    use InteractsWithQueue, Queueable;

    /**
     * Perform the action on the given models.
     *
     * @param  \Laravel\Nova\Fields\ActionFields  $fields
     * @param  \Illuminate\Support\Collection  $models
     * @return mixed
     */
    public function handle(ActionFields $fields, Collection $models)
    {
        foreach ($models as $model) {

            $model->flyers()->attach($fields->flyers);
//            dd( $model);
        }
//        $crop = Crop::query()->find($models);
    }

    /**
     * Get the fields available on the action.
     *
     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
     * @return array
     */
    public function fields(NovaRequest $request)
    {
//        dd($request->resourceId);
//        dd($request->all());
        $crop = Crop::query()->find($request->resourceId ?? $request->resources);
        $flyersID = [];
//        dd($crop);
        if ($crop->flyers) {
            foreach ($crop->flyers as $flyer) {
                $flyersID[] = $flyer->id;
            }
        }
//        dd($crop->flyers);

        $flyersAll = Flyer::query()->whereNotIn('id', $flyersID)->get();
        $flyers = [];
        foreach ($flyersAll as $flyer) {
            $flyers[(integer)$flyer->id] = $flyer->system_name;
        }
        return [
            MultiSelect::make('Flyers')
                ->options($flyers),
        ];
    }
}

• [F] AttachCropToProduct.php
  Delete
• [F] AttachFlyerToCrop.php
  Delete