/**
* This method returns a copy of this list that does not contain any DataObjects that exists in $list
*
* The $list passed needs to contain the same dataclass as $this
*
* @param SS_List $list
* @return DataList
* @throws BadMethodCallException
*/
public function subtract(SS_List $list)
{
if ($this->dataclass() != $list->dataclass()) {
throw new InvalidArgumentException('The list passed must have the same dataclass as this class');
}
return $this->alterDataQuery(function ($query) use($list) {
$query->subtract($list->dataQuery());
});
}
/**
* This method returns a list does not contain any DataObjects that exists in $list
*
* It does not return the resulting list, it only adds the constraints on the database to exclude
* objects from $list.
* The $list passed needs to contain the same dataclass as $this
*
* @param SS_List $list
* @return DataList
* @throws BadMethodCallException
*/
public function subtract(SS_List $list)
{
if ($this->dataclass() != $list->dataclass()) {
throw new InvalidArgumentException('The list passed must have the same dataclass as this class');
}
$newlist = clone $this;
$newlist->dataQuery->subtract($list->dataQuery());
return $newlist;
}
