Duplicate Resource Action for Laravel Nova

DuplicateResource.php

<?php

namespace App\Nova\Actions;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Collection;
use Laravel\Nova\Actions\Action;
use Laravel\Nova\Fields\ActionFields;

abstract class DuplicateResource extends Action {

    use SerializesModels;

    public $showOnDetail = true;
    public $showOnIndex = false;
    public $showOnTableRow = true;
    public $confirmButtonText = 'Duplicate Resource';
    public $cancelButtonText = 'Cancel';
    public $confirmText = 'Are you sure you want to duplicate this resource?';
    public $withoutActionEvents = true;

    protected $keepRelations = [];
    protected $duplicateRelations = [];

    /**
     * Perform the action on the given models.
     *
     * @param ActionFields $fields
     * @param Collection   $models
     *
     * @return mixed
     */
    public function handle(ActionFields $fields, Collection $models)
    {
        if ($models->count() !== 1) {
            return Action::danger("Cannot duplicate multiple models simultaneously.");
        }

        $model = $models->first();
        $newModel = $model->replicate();

        // Override values from fields
        foreach ($fields->getAttributes() as $key => $value) {
            if(isset($value)){
                $newModel->$key = $value;
            }
        }

        $newModel->push();

        if (!empty($this->duplicateRelations)) {
            // load the relations
            $model->load($this->duplicateRelations);
            foreach ($model->getRelations() as $relation => $items) {
                // works for hasMany
                foreach ($items as $item) {
                    // clean up our models, remove the id and remove the appends
                    unset($item->id);
                    $item->setAppends([]);
                    // create a relation on the new model with the data.
                    $newModel->{$relation}()->create($item->toArray());
                }
            }
        }

        if (!empty($this->keepRelations)) {
            // load the fresh model with relations to maintain
            unset($model->relations);
            $model->load($this->keepRelations);

            foreach ($model->getRelations() as $relation => $items) {
                // works for hasMany
                foreach ($items as $item) {
                    $newModel->{$relation}()->attach($item);
                }
            }
        }

        $newModel->save();

        return Action::message($this->getSuccessMessage($model, $newModel, $fields));
    }

    protected function getSuccessMessage(Model $originalModel, Model $newModel, ActionFields $fields) : String {
        return "Resource has been duplicated.";
    }

    /**
     * Get the fields available on the action.
     *
     * @return array
     */
    public function fields()
    {
        return [];
    }
}

And also when I have: abstract class DuplicateResource extends Action it shows error. So, I removed abstract and it works for one record.

It's written as an abstract class so that you extend it for your own needs rather than just using it directly. If you just want to hack it in place, probably remove $model = $models->first(); and put in a foreach on the $models parameter.

The PHP docs can be pretty tough to read but try https://www.php.net/manual/en/language.oop5.abstract.php. There are probably lots of other good resources on OOP that will help you better understand abstract classes too.

@ns139426 thankyou thankyou thankyou. your work is greatly appreciated. :)

Thanks a lot. I appreciate you effort.