php - SilverStripe SQL boolean value syntax error -


i trying return sql query code below. reason boolean values i'm trying filter ('showonhomepage' , 'published') throwing following syntax error due question mark placeholder.

you have error in sql syntax; check manual corresponds >your mysql server version right syntax use near '?) , ("dummycontentone"."showonhomepage" = ?)) "dummycontentone" union (s' @ line 5

public function getsitecontent() {     if($this->_contentlist!=false) {         return $this->_contentlist;     }      $request = (controller::has_curr() ? controller::curr()->getrequest() : null);     $start = round(($request ? intval($request->getvar('start')) : 0));      $dummycontentone = dummycontentone::get()->filter('published', true)->filter('showonhomepage', true)->dataquery()->query()->setorderby(null);     $dummycontenttwo = dummycontenttwo::get()->filter('published', true)->filter('showonhomepage', true)->dataquery()->query()->setorderby(null);      $this->fixquerycolumns($dummycontentone, $dummycontenttwo);      $db = db::query(         'select * '.         'from ('.$dummycontentone->sql().') "dummycontentone" '.         'union ('.$dummycontenttwo->sql().') '.         'order "date" desc, "created" desc '.         'limit '.$this->config()->item_count.' offset '.$start     );      // merge array list     $list = new arraylist();     foreach($db $row) {         $classname=$row['classname'];         $list->push(new $classname($row, false, datamodel::inst()));     }      // calculate total number of items     $totalitems = $dummycontentone->count() + $dummycontenttwo->count();      // convert paginated list     $pagedlist=actionpaginatedlist::create($list, $this->link('more-content'), $request)     ->setpagelength($this->config()->item_count)     ->setpagestart($start)     ->settotalitems($totalitems)     ->setlimititems(false);      return $pagedlist; }  ...  private function fixquerycolumns() {     $queries = func_get_args();     $columns = array();      // debug::show($queries);      // of columns each query     foreach($queries $query) {         $columns = array_merge($columns, array_keys($query->getselect()));     } ...

any ideas cause this?

i'm using ss3.2

thanks


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