Laratrust\Traits\LaratrustRoleTrait::attachPermission PHP Method

    public function attachPermission($permission)
    {
        if (is_object($permission)) {
            $permission = $permission->getKey();
        }
        if (is_array($permission)) {
            $permission = $permission['id'];
        }
        $this->permissions()->attach($permission);
        $this->flushCache();
        return $this;
    }