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Data Model Questions

SS3 custom joins


3 Posts   531 Views


23 February 2013 at 7:50am Community Member, 13 Posts

In SS2 I had:

$conductors = DataObject::get('Performer', "PerformerType.IsConductor", "", "INNER JOIN `PerformerType` ON PerformerType.ID = SiteTree.ParentID"

Could someone please give me a clue how to achieve the same thing using (I assume) innerJoin syntax?

I have Performers and PerformerTypes tables (pages) - the latter has a flag (IsConductor). I am trying to extract just those Performers whose PerformerType is IsConductor, for a dropdown field on the back end.

By the way I see backticks generate an error now.

So far I have got:

$conductors = Performer::get()->innerJoin("PerformerType", "PerformerType.ID = SiteTree.ParentID");
$conductors->filter("IsConductor", true);

but the filter is not being applied. There's probably a far more elegant way to do it anyway - having to refer to SiteTree doesn't feel right.



23 February 2013 at 1:49pm Community Member, 27 Posts

There's a few ways to do what your trying to fix what you have:

$conductors = Performer::get()->innerJoin("PerformerType", "PerformerType.ID = SiteTree.ParentID");
$conductors = $conductors->filter("IsConductor", true);

Or you could do it all in one shot:

$conductors = Performer::get()->innerJoin("PerformerType", "PerformerType.ID = SiteTree.ParentID")->filter("IsConductor", true);

The reason your filter is not being applied is because each time you call a modifier on a DataList (which is what Performer::get() returns) it creates a clone before modifying. Which is why your filter doesn't get applied.


25 February 2013 at 10:24pm Community Member, 13 Posts

Many thanks - I think that was the one permutation I hadn't tried! And just in case anyone else stumbles here this:

$conductors = $conductors->toDropdownMap('ID', 'Title', '(Select one)', true);

becomes this:


$conductorfield = new DropdownField('ConductorID', 'Conductor', $conductors->map('ID', 'Title'));
      $conductorfield->setEmptyString('(Select one)');
      $fields->addFieldToTab('Root.Main', $conductorfield, 'Content');