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Data Model Questions /

Moderators: martimiz, Sean, Ed, biapar, Willr, Ingo, swaiba

Make ModelAdmin sort relation attributes in result table

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Community Member, 7 Posts

7 October 2011 at 10:07am

Edited: 07/10/2011 10:10am


I'm looking into the possibility to get ModelAdmin to sort a result table on a relation attribute. To gain a better understanding of what I'm trying to accomplish I'm going to provide my current working solution (of which I'm not very proud ;))

class MyModel extends DataObject {
	$has_one = array('Owner' => 'Member');
	$summary_fields = array('Owner.Title');
	public function extendedSQL($filter = "", $sort = "", $limit = "", $join = "", $having = "") {
		$query = parent::extendedSQL($filter, $sort, $limit, $join, $having);
		// As ugly as ugly gets
		return MySQLQuery::cast($query);

class MySQLQuery extends SQLQuery {
	public static function cast($source) {
		if ($source instanceof SQLQuery) {
			$serialized = serialize($source);
			$serialized = str_replace('8:"SQLQuery"', '10:"MySQLQuery"', $serialized);
			$target = unserialize($serialized);
			foreach ($source as $prop => $value)
				$target->$prop = $value;
			return $target;
		return $source;

	public function canSortBy($fieldName) {
		if ($fieldName == 'Owner.Title') return true;
		return parent::canSortBy($fieldName);

	public function execute() {
		if (substr($this->orderby, 0, 11) == 'Owner.Title') {
			$sort = trim(substr($this->orderby, -4));
			$this->orderby = "Member.FirstName $sort, Member.Surname $sort";
			$this->leftJoin('Member', 'MyModel.OwnerID = Member.ID');
		return parent::execute();

As you can see I'm trying to sort the table by the owners first- and surname. I got it working but I'm hoping someone might have a better way to accomplish this that is less of a hack.

/ John