Disallow Duplication of Elements

[shifuma]

I need to prevent authors from duplicating entries. Unfortunately, there's no specific permission on Users/Groups, but I do see canDuplicate: https://docs.craftcms.com/api/v5/craft-base-element.html#method-canduplicate

How could I use that in an event or something? Specifically, I want to hide the 'Duplicate' action in the menu for all elements. I've also played with EVENT_REGISTER_ACTIONS but couldn't get it to correctly unset the duplicate action.

Any advice would be very helpful!

[brandonkelly]

Create a module with the following code:

use Craft;
use craft\elements\actions\Duplicate;
use craft\elements\Entry;
use craft\events\AuthorizationCheckEvent;
use craft\events\RegisterElementActionsEvent;
use craft\services\Elements;
use yii\base\Event;

// Remove the “Duplicate” bulk action on entry indexes
Event::on(Entry::class, Entry::EVENT_REGISTER_ACTIONS, function(RegisterElementActionsEvent $event) {
    $event->actions = array_filter($event->actions, function($action) {
        $type = is_array($action) ? $action['type'] : $action;
        return $type !== Duplicate::class;
    });
});

// Prevent the “Save as a new entry” action on entry edit pages
Craft::$app->elements->on(Elements::EVENT_AUTHORIZE_DUPLICATE_AS_DRAFT, function(AuthorizationCheckEvent $event) {
    if ($event->element instanceof Entry) {
        $event->authorized = false;
    }
});