/**
* If HideUnmatchedFilters is on then remove all filters which are not found in the items by their 'AssociatedFilters' relationship.
*
* @param \DataList $filters list of GridListFilter models
* @param array $parameters
* @return \ArrayList
*/
public function constrainGridListFilters(&$filters, &$parameters = [])
{
$out = new \ArrayList();
if ($this()->{self::SingleFieldName}) {
$ids = $filters->column('ID');
if (count($ids)) {
$items = $this()->GridListItems();
// this is where we keep track of GridListFilters which have been found on items where ID is the key
$foundFilters = array_combine($ids, array_fill(0, count($ids), false));
foreach ($foundFilters as $filterID => &$found) {
/** @var \Page|Model $item */
foreach ($items as $item) {
if ($item->hasExtension(HasGridListFilters::class_name())) {
if ($itemFilters = $item->{HasGridListFilters::relationship_name()}()->column('ID')) {
if (in_array($filterID, $itemFilters)) {
$found = true;
break;
}
}
}
}
}
foreach ($filters as $filter) {
if (isset($foundFilters[$filter->ID])) {
$out->push($filter);
}
}
$filters = $out;
}
}
}
/**
* Provide pages which have
*
* @return \DataList
*/
public function provideGridListItems($parameters = [])
{
if ($this()->{self::SingleFieldName}) {
if ($this()->hasExtension(HasGridListFilters::class_name())) {
$filterIDs = $this->filterIDs();
// name of the field on Pages
$filterField = HasGridListFilters::relationship_name('ID');
$pages = \Page::get()->filter([$filterField => $filterIDs]);
// debug help
$count = $pages->count();
return $pages;
}
}
}
/**
* @return \ArrayList
*/
protected function items($mode)
{
static $items;
if (!$items) {
$providers = $this->providers();
$items = new \ArrayList();
$service = $this->service();
$currentFilterID = $service->Filters()->currentFilterID();
foreach ($providers as $provider) {
// first we get any items related to the GridList itself , e.g. curated blocks added by HasBlocks
// this will return an array of SS_Lists
$lists = $provider->extend('provideGridListItems');
/** @var \ManyManyList $list */
foreach ($lists as $itemList) {
// filter to current filter if set
if ($currentFilterID) {
$itemList = $itemList->filter([HasGridListFilters::relationship_name('ID') => $currentFilterID]);
}
$items->merge($itemList);
}
}
$items->removeDuplicates();
}
return $items;
}
public function FilterTags()
{
return implode(' ', array_merge($this()->{HasGridListFilters::relationship_name()}()->column('ModelTag'), $this()->hasMethod('customFilterTags') ? $this()->customFilterTags() : []));
}
