silverstripe-subsites/code/extensions/SiteConfigSubsites.php

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<?php
/**
* Extension for the SiteConfig object to add subsites support
*/
class SiteConfigSubsites extends DataExtension {
private static $has_one = array(
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'Subsite' => 'Subsite', // The subsite that this page belongs to
);
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/**
* Update any requests to limit the results to the current site
*/
public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null) {
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if(Subsite::$disable_subsite_filter) return;
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// If you're querying by ID, ignore the sub-site - this is a bit ugly...
if($query->filtersOnID()) return;
$regexp = '/^(.*\.)?("|`)?SubsiteID("|`)?\s?=/';
foreach($query->getWhereParameterised($parameters) as $predicate) {
if(preg_match($regexp, $predicate)) return;
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}
/*if($context = DataObject::context_obj()) $subsiteID = (int)$context->SubsiteID;
else */$subsiteID = (int)Subsite::currentSubsiteID();
$froms=$query->getFrom();
$froms=array_keys($froms);
$tableName = array_shift($froms);
if($tableName != 'SiteConfig') return;
$query->addWhere("\"$tableName\".\"SubsiteID\" IN ($subsiteID)");
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}
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function onBeforeWrite() {
if((!is_numeric($this->owner->ID) || !$this->owner->ID) && !$this->owner->SubsiteID) $this->owner->SubsiteID = Subsite::currentSubsiteID();
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}
/**
* Return a piece of text to keep DataObject cache keys appropriately specific
*/
function cacheKeyComponent() {
return 'subsite-'.Subsite::currentSubsiteID();
}
function updateCMSFields(FieldList $fields) {
$fields->push(new HiddenField('SubsiteID','SubsiteID', Subsite::currentSubsiteID()));
}
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}