In Twig code you can use
craft->entries->relatedTo to do all sorts of neat things.
From plugin code I am not sure how this works?
$c = craft()->elements->getCriteria(ElementType::Entry); $c->section = 'concepts'; $c->relatedTo(array('targetElement'=>$e, 'field'=>'entry')); $concepts = $c->find();
This doesn't throw an error - but it doesn't work either.
How can I use the criteria model to retrieve entries that have some relationship?