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?
Cheers!