...
    $filter->begindate = new dateField("created", "created_begin","eu");
    $filter->begindate->db_name="users.created";
    $filter->begindate->clause="where";
    $filter->begindate->operator=">";
    
    $filter->enddate = new dateField("created", "created_end_date","eu");
    $filter->enddate->db_name="users.created";
    $filter->enddate->clause="where";
    $filter->enddate->operator="<=";
    $filter->enddate->in="begindate";
...

class secure_datagrid_library extends datagrid_library
{
    function  __construct($config = array()) {
        $this->acl = new acl_library();
        parent::__construct($config);
    }

    public function set_column()
    {
        $column = array();
        if (func_num_args() == 3)
        {
            list($column['pattern'], $column['label'], $column['orderby']) = func_get_args();
        }
        if (func_num_args() == 2)
        {
            list($column['pattern'], $column['label']) = func_get_args();
        }
        if (func_num_args() == 1)
        {
            $column = func_get_arg(0);
        }
        //share source with columns
        if (!isset($column['source']))
            $column['source'] = $this->source;
        //detect if is a checkbox column
        if (isset($column['checkbox']))
            $this->checkbox_form = true;
        
        
        if($this->acl->allowed('item','*','*',$column["pattern"]))
        {
            $column = new datagrid_column($column);
            $this->columns[] = $column;
            return $column;
        }
        else
        {
            return FALSE;
        }
    }
}

class acl_library extends rpd_auth_library
{
    function __construct()
    {
        $this->acl_model = new acl_model();
        parent::__construct();
    }

    function allowed($controller=NULL, $method=NULL, $action=NULL, $field=NULL)
    {
        if($controller === NULL)
        {
            $controller = $this->get_controller();
        }
        if($method === NULL)
        {
            $method = $this->get_method();
        }
        if($action === NULL)
        {
            $action = '*';
        }
        if($field === NULL)
        {
            $field = '*';
        }
        
        return $this->acl_model->_allowed($this->user("role_id"), $controller, $method, $action, $field);
    }
}

class acl_model extends rpd
{
    function  __construct()
    {
        $this->db = rpd::$db;
    }
    
    function _allowed($role_id, $controller=NULL, $method=NULL, $action=NULL, $field=NULL)
    {
        //$this->$db->db_debug = true;
        $this->db->from('roles_permissions');
        $this->db->join("permissions","permissions.permission_id=roles_permissions.permission_id");
        $this->db->where('role_id', $role_id);

        $this->db->where('controller', $controller);

        $this->db->where('method', $method);
        $this->db->orwhere('method', '*');

        $this->db->where('action', $action);
        $this->db->orwhere('action', '*');
       
        $this->db->where('field', $field);
        $this->db->orwhere('field', '*');

        $this->db->get();


        $permission = $this->db->row_object();
        //var_dump($user);
        if ($permission===false) return false;

        return $permission->access;

    }
}

$filter = new datafilter_library();
$filter->db->select("*");
$filter->db->from("items");
$filter->db->join("users","users.user_id=items.user_id");
$filter->db->orderby("staerke,geschick,technik,speed,geschick");

....

$grid = new secure_datagrid_library();
$grid->source($filter);
$grid->db->where("state", 1);

SELECT *
FROM iv_items, iv_roles_permissions
JOIN iv_users ON iv_users.user_id=iv_items.user_id
JOIN iv_permissions ON iv_permissions.permission_id=iv_roles_permissions.permission_id
WHERE state = 1
AND role_id = '1'
AND controller = 'item'
AND method = '*'
OR method = '*'
AND action = '*'
OR action = '*'
AND field = 'username'
OR field = '*'
ORDER BY staerke,geschick,technik,speed,geschick

...
$grid->column(NULL,'')->callback('callback_free_item', $this);
...

function callback_free_item($row)
    {
        if($row["user_id"] == rpd::$auth->user('user_id'))
                return '<a href="/index.php/item/item_free/1002" onclick="return confirm(\'sure\')"><img src="/core/assets/switch.png"  style="vertical-align:middle" /></a>';
    }
...