Phalcon: find() + Paginator - pagination

Question

I have a MySQL database and a table within it. The mission is to set a method, which will receive 2 parameters(?user_id=...&action_id...) and search for records matching these two fields or one of them, if only one was set(?user_id=...), then paginate them and send them to the action view. I've just started to learn Phalcon a week ago, have done some research here and there, read the docs and still don't realize how i can do this.
What i've done so far:
public function searchAction()
{
$userID = $this->request->get("user_id", "int", 0);
$actionID = $this->request->get("action_id", "int", 0);
$currentPage = 1;
$currentPage = (int) $_GET["page"];
$parameters = array(
'user_id' => $userID,
'action_id' => $actionID
);
$o = History::find($parameters);
$paginator = new Paginator(array(
"data" => $o,
"limit" => 10,
"page" => $currentPage
));
$page = $paginator->getPaginate();
$this->view->setVar("page", $page);
}
Pagination is working somehow but the search is not, why?

Answer 1

First parameter in the method find() or findFirst() must be a string to set conditions to the query.
In your case, you can search like that:
$o = History::find('user_id = "'.$userID.'" AND action_id = "'.$action_id.'"');
But, if you want add more parameters, then you need to pass array and the first element must contain search conditions:
$o = History::find(array(
'user_id = "'.$userID.'" AND action_id = "'.$action_id.'"',
'limit' => 10,
'order' => 'user_id ASC'
));

Answer 2

Referring to official documentation http://docs.phalconphp.com/en/latest/reference/models.html#binding-parameters
$conditions = "user_id = ?1 AND action_id = ?2";
$parameters = array(1 => userID, 2 => $actionID);
$o = History::find(array(
$conditions,
"bind" => $parameters
));
Index of parameters array must match number of placeholder in conditions string.