clrghouz/app/Models/Policies/EchomailPolicy.php

<?php

namespace App\Models\Policies;

use Illuminate\Auth\Access\HandlesAuthorization;

use App\Models\{Echomail,User};

class EchomailPolicy
{
	use HandlesAuthorization;

	/**
	 * This determines whether a logged-in user can view an echomail
	 *
	 * @param User $user
	 * @param Echomail $o
	 * @return bool
	 */
	public function view(User $user, Echomail $o): bool
	{
		return (
			$user->isAdmin()
			|| $user->isZC()
			|| $o->seenby->pluck('id')->intersect($user->addresses()->pluck('id'))->count()
		);
	}
}