php - SilverStripe 3 Filtering / Filtering Out DataObjects in a Function -

i've found examples of filtering nothing clear enough answer question. have following function grand children pages. i'm trying count them if meet criteria. in case if not have x,y,z include them in count.

in other words add list / array of arguments function if true don't include them , filter them out. example if dealeronly = true ignore.

i thought doing in template , using if / else count won't display haven't gone down route.

alternative methods welcome.

<% loop $grandchildren %>$count<% end_loop %>    

possible help: http://www.silverstripe.org/community/forums/data-model-questions/show/23507

docs here: (not quite need though) https://docs.silverstripe.org/en/3.1/developer_guides/model/searchfilters/

my function returns grandchild pages.

public function getgrandchildren() {     $ids = page::get()->filter(array('parentid' => $this->id))->getidlist();     $grandchildren = page::get()->filter(array(         'parentid' => $ids     ));      return $grandchildren; } 

in template counts pages

$grandchildren.count 

well, can manipulate datalist want, e.g.

public function getgrandchildren() {     $ids = page::get()->filter(array('parentid' => $this->id))->getidlist();     $grandchildren = page::get()         ->filter(array(             'parentid' => $ids         ))         ->exclude(array('dealeronly' => true));      return $grandchildren; } 

see api docs datalist::exclude , docs

if want exclude if of more columns in database true, have use :not searchfilter modifier unfortunately there no excludeany() function.

->filter(array('dealeronly:not' => true)) ->filter(array('foo:not' => 'bar'))